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<div class="title">llfio_v2_xxx::handle Class Reference</div> </div>
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<p>A native_handle_type which is managed by the lifetime of this object instance.
<a href="classllfio__v2__xxx_1_1handle.html#details">More...</a></p>
<p><code>#include "handle.hpp"</code></p>
<div class="dynheader">
Inheritance diagram for llfio_v2_xxx::handle:</div>
<div class="dyncontent">
<div class="center">
<img src="classllfio__v2__xxx_1_1handle.png" usemap="#llfio_5Fv2_5Fxxx::handle_map" alt=""/>
<map id="llfio_5Fv2_5Fxxx::handle_map" name="llfio_5Fv2_5Fxxx::handle_map">
<area href="classllfio__v2__xxx_1_1awaitable__handle.html" title="An awaitable handle which attempts to execute the i/o immediately. If the i/o can complete immediatel..." alt="llfio_v2_xxx::awaitable_handle< IoHandleType >" shape="rect" coords="0,56,284,80"/>
<area href="classllfio__v2__xxx_1_1io__handle.html" title="A handle to something capable of scatter-gather byte i/o." alt="llfio_v2_xxx::io_handle" shape="rect" coords="441,56,725,80"/>
<area href="classllfio__v2__xxx_1_1io__multiplexer.html" title="A multiplexer of byte-orientated i/o." alt="llfio_v2_xxx::io_multiplexer" shape="rect" coords="735,56,1019,80"/>
<area href="classllfio__v2__xxx_1_1path__handle.html" title="A handle to somewhere originally identified by a path on the filing system. Typically used as the lig..." alt="llfio_v2_xxx::path_handle" shape="rect" coords="1029,56,1313,80"/>
<area href="classllfio__v2__xxx_1_1process__handle.html" title="A handle to this, or another, process." alt="llfio_v2_xxx::process_handle" shape="rect" coords="1323,56,1607,80"/>
<area href="classllfio__v2__xxx_1_1section__handle.html" title="A handle to a source of mapped memory." alt="llfio_v2_xxx::section_handle" shape="rect" coords="1617,56,1901,80"/>
<area href="classllfio__v2__xxx_1_1symlink__handle.html" title="A handle to an inode which redirects to a different path." alt="llfio_v2_xxx::symlink_handle" shape="rect" coords="1911,56,2195,80"/>
<area href="classllfio__v2__xxx_1_1lockable__io__handle.html" title="A handle to something capable of scatter-gather i/o and which can exclude other concurrent users...." alt="llfio_v2_xxx::lockable_io_handle" shape="rect" coords="294,112,578,136"/>
<area href="classllfio__v2__xxx_1_1pipe__handle.html" title="A handle to a named or anonymous pipe." alt="llfio_v2_xxx::pipe_handle" shape="rect" coords="588,112,872,136"/>
<area href="classllfio__v2__xxx_1_1directory__handle.html" title="A handle to a directory which can be enumerated." alt="llfio_v2_xxx::directory_handle" shape="rect" coords="1029,112,1313,136"/>
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<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-types"></a>
Public Types</h2></td></tr>
<tr class="memitem:aa3930273a2d4cabbac309e0b75701dca"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dca">mode</a> : unsigned char { <br />
  <b>unchanged</b> = 0,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dcaa334c4a4c42fdb79d7ebc3e73b517e6f8">mode::none</a> = 2,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dcaaa4daf6d1e8da35af49c33bbe9ee91d79">mode::attr_read</a> = 4,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dcaa9f56aff64cb748e078ab221474132d19">mode::attr_write</a> = 5,
<br />
  <a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dcaaecae13117d6f0584c25a9da6c8f8415e">mode::read</a> = 6,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dcaaefb2a684e4afb7d55e6147fbe5a332ee">mode::write</a> = 7,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dcaa9516dfb15f51c7ee19a4d46b8c0dbe1d">mode::append</a> = 9
<br />
}</td></tr>
<tr class="memdesc:aa3930273a2d4cabbac309e0b75701dca"><td class="mdescLeft"> </td><td class="mdescRight">The behaviour of the handle: does it read, read and write, or atomic append? <a href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dca">More...</a><br /></td></tr>
<tr class="separator:aa3930273a2d4cabbac309e0b75701dca"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:af0b352d0f273ba6fa70c178b2c2fee42"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42">creation</a> : unsigned char { <br />
  <a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42aa200dcd6176417e93be2405188ae7cc9">creation::open_existing</a> = 0,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42abba3bc579480e6c94ecd81b7b5923255">creation::only_if_not_exist</a>,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42a8f0339e854eb5321306a443ce9199e1d">creation::if_needed</a>,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42abb872caae430ba70f670508aca38feed">creation::truncate_existing</a>,
<br />
  <a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42af7cf95e0f43dc8f79e39ae628c85a11d">creation::always_new</a>
<br />
}</td></tr>
<tr class="memdesc:af0b352d0f273ba6fa70c178b2c2fee42"><td class="mdescLeft"> </td><td class="mdescRight">On opening, do we also create a new file or truncate an existing one? <a href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42">More...</a><br /></td></tr>
<tr class="separator:af0b352d0f273ba6fa70c178b2c2fee42"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aecd3a7db6cee3aec07d32fe6f99e6852"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a> : unsigned char { <br />
  <b>unchanged</b> = 0,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852a334c4a4c42fdb79d7ebc3e73b517e6f8">caching::none</a> = 1,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852ab8a61dd00ce6fc5888706bda8fab2e98">caching::only_metadata</a> = 2,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852a0fb9cf5f04f61bb6f1151da57ceb1ca1">caching::reads</a> = 3,
<br />
  <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852adec4ecca8ae1593f84eea4656599a693">caching::reads_and_metadata</a> = 5,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852aa181a603769c1f98ad927e7367c7aa51">caching::all</a> = 6,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852a9cd65f46f55fb6a4b198fcee6f0a63c1">caching::safety_barriers</a> = 7,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852ad5197d93c063a2b1e22d1630a39b7aef">caching::temporary</a> = 8
<br />
}</td></tr>
<tr class="memdesc:aecd3a7db6cee3aec07d32fe6f99e6852"><td class="mdescLeft"> </td><td class="mdescRight">What i/o on the handle may complete immediately due to kernel caching. <a href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">More...</a><br /></td></tr>
<tr class="separator:aecd3a7db6cee3aec07d32fe6f99e6852"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a33481bae57d9ccd0c97946416f9682f3"><td class="memItemLeft" align="right" valign="top"><a id="a33481bae57d9ccd0c97946416f9682f3"></a>
using </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a33481bae57d9ccd0c97946416f9682f3">path_type</a> = filesystem::path</td></tr>
<tr class="memdesc:a33481bae57d9ccd0c97946416f9682f3"><td class="mdescLeft"> </td><td class="mdescRight">The path type used by this handle. <br /></td></tr>
<tr class="separator:a33481bae57d9ccd0c97946416f9682f3"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a4ee58f1b6a24af5e64d850d1e3eed07f"><td class="memItemLeft" align="right" valign="top"><a id="a4ee58f1b6a24af5e64d850d1e3eed07f"></a>
using </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ee58f1b6a24af5e64d850d1e3eed07f">extent_type</a> = unsigned long long</td></tr>
<tr class="memdesc:a4ee58f1b6a24af5e64d850d1e3eed07f"><td class="mdescLeft"> </td><td class="mdescRight">The file extent type used by this handle. <br /></td></tr>
<tr class="separator:a4ee58f1b6a24af5e64d850d1e3eed07f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aed9587571c3fb932adadddc1beeeed58"><td class="memItemLeft" align="right" valign="top"><a id="aed9587571c3fb932adadddc1beeeed58"></a>
using </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#aed9587571c3fb932adadddc1beeeed58">size_type</a> = size_t</td></tr>
<tr class="memdesc:aed9587571c3fb932adadddc1beeeed58"><td class="mdescLeft"> </td><td class="mdescRight">The memory extent type used by this handle. <br /></td></tr>
<tr class="separator:aed9587571c3fb932adadddc1beeeed58"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:ac5222904f116c9beb0515a4a5aa850bf"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ac5222904f116c9beb0515a4a5aa850bf">QUICKCPPLIB_BITFIELD_BEGIN</a> (flag)</td></tr>
<tr class="memdesc:ac5222904f116c9beb0515a4a5aa850bf"><td class="mdescLeft"> </td><td class="mdescRight">Bitwise flags which can be specified. <a href="classllfio__v2__xxx_1_1handle.html#ac5222904f116c9beb0515a4a5aa850bf">More...</a><br /></td></tr>
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<tr class="memitem:aa7e9bedf8c7a4c4a79a644a6e1857ee4"><td class="memItemLeft" align="right" valign="top"><a id="aa7e9bedf8c7a4c4a79a644a6e1857ee4"></a>
 </td><td class="memItemRight" valign="bottom"><b>QUICKCPPLIB_BITFIELD_END</b> (flag)</td></tr>
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constexpr </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#aea43917ff5cc28f3da3c622c0b3382c4">handle</a> ()</td></tr>
<tr class="memdesc:aea43917ff5cc28f3da3c622c0b3382c4"><td class="mdescLeft"> </td><td class="mdescRight">Default constructor. <br /></td></tr>
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constexpr </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ad7912947fb8fe6270535eb6bddba50d4">handle</a> (<a class="el" href="structllfio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> h, <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a> <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a>=<a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852a334c4a4c42fdb79d7ebc3e73b517e6f8">caching::none</a>, flag <a class="el" href="classllfio__v2__xxx_1_1handle.html#a013936bc1254b1a47567fe29698d1b1c">flags</a>=flag::none) noexcept</td></tr>
<tr class="memdesc:ad7912947fb8fe6270535eb6bddba50d4"><td class="mdescLeft"> </td><td class="mdescRight">Construct a handle from a supplied native handle. <br /></td></tr>
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 </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a798fa51a935da9b16ed7bb565b3a4c11">handle</a> (const <a class="el" href="classllfio__v2__xxx_1_1handle.html">handle</a> &)=delete</td></tr>
<tr class="memdesc:a798fa51a935da9b16ed7bb565b3a4c11"><td class="mdescLeft"> </td><td class="mdescRight">No copy construction (use clone()) <br /></td></tr>
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<tr class="memitem:ab7a7864db8369f8e62ae81586ef68ef0"><td class="memItemLeft" align="right" valign="top"><a id="ab7a7864db8369f8e62ae81586ef68ef0"></a>
<a class="el" href="classllfio__v2__xxx_1_1handle.html">handle</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ab7a7864db8369f8e62ae81586ef68ef0">operator=</a> (const <a class="el" href="classllfio__v2__xxx_1_1handle.html">handle</a> &o)=delete</td></tr>
<tr class="memdesc:ab7a7864db8369f8e62ae81586ef68ef0"><td class="mdescLeft"> </td><td class="mdescRight">No copy assignment. <br /></td></tr>
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constexpr </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a6ce55ea40b3a0c313f3cb34bb59750f0">handle</a> (<a class="el" href="classllfio__v2__xxx_1_1handle.html">handle</a> &&o) noexcept</td></tr>
<tr class="memdesc:a6ce55ea40b3a0c313f3cb34bb59750f0"><td class="mdescLeft"> </td><td class="mdescRight">Move the handle. <br /></td></tr>
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<tr class="memitem:a4acd6daf162e10373efedf7fd8528365"><td class="memItemLeft" align="right" valign="top"><a id="a4acd6daf162e10373efedf7fd8528365"></a>
<a class="el" href="classllfio__v2__xxx_1_1handle.html">handle</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a4acd6daf162e10373efedf7fd8528365">operator=</a> (<a class="el" href="classllfio__v2__xxx_1_1handle.html">handle</a> &&o) noexcept</td></tr>
<tr class="memdesc:a4acd6daf162e10373efedf7fd8528365"><td class="mdescLeft"> </td><td class="mdescRight">Move assignment of handle. <br /></td></tr>
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void </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a4716696b8700953889006251e0678aa4">swap</a> (<a class="el" href="classllfio__v2__xxx_1_1handle.html">handle</a> &o) noexcept</td></tr>
<tr class="memdesc:a4716696b8700953889006251e0678aa4"><td class="mdescLeft"> </td><td class="mdescRight">Swap with another instance. <br /></td></tr>
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<tr class="memitem:a00a85eec5a41f7edb2c574d40cf04535"><td class="memItemLeft" align="right" valign="top">virtual result< <a class="el" href="classllfio__v2__xxx_1_1handle.html#a33481bae57d9ccd0c97946416f9682f3">path_type</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a00a85eec5a41f7edb2c574d40cf04535">current_path</a> () const noexcept</td></tr>
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<tr class="memitem:a62a75b1a4a24fbc9ad2e98a641167db6"><td class="memItemLeft" align="right" valign="top"><a id="a62a75b1a4a24fbc9ad2e98a641167db6"></a>
virtual result< void > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a62a75b1a4a24fbc9ad2e98a641167db6">close</a> () noexcept</td></tr>
<tr class="memdesc:a62a75b1a4a24fbc9ad2e98a641167db6"><td class="mdescLeft"> </td><td class="mdescRight">Immediately close the native handle type managed by this handle. <br /></td></tr>
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<tr class="memitem:aeea4389189021b94dde6d8f2c3ccc5b3"><td class="memItemLeft" align="right" valign="top">result< <a class="el" href="classllfio__v2__xxx_1_1handle.html">handle</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#aeea4389189021b94dde6d8f2c3ccc5b3">clone</a> () const noexcept</td></tr>
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virtual <a class="el" href="structllfio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a1d273e38c061eb11f5012f624e9a202e">release</a> () noexcept</td></tr>
<tr class="memdesc:a1d273e38c061eb11f5012f624e9a202e"><td class="mdescLeft"> </td><td class="mdescRight">Release the native handle type managed by this handle. <br /></td></tr>
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<tr class="memitem:a5c7f6a0a8ffdea22763c75a9319ba0c2"><td class="memItemLeft" align="right" valign="top"><a id="a5c7f6a0a8ffdea22763c75a9319ba0c2"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a5c7f6a0a8ffdea22763c75a9319ba0c2">is_valid</a> () const noexcept</td></tr>
<tr class="memdesc:a5c7f6a0a8ffdea22763c75a9319ba0c2"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is valid (and usually open) <br /></td></tr>
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bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a97e0884c27147b4929be98961b8e9254">is_readable</a> () const noexcept</td></tr>
<tr class="memdesc:a97e0884c27147b4929be98961b8e9254"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is readable. <br /></td></tr>
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bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a211fee447a47bdeb5424a2a5ae1de852">is_writable</a> () const noexcept</td></tr>
<tr class="memdesc:a211fee447a47bdeb5424a2a5ae1de852"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is writable. <br /></td></tr>
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bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ac3aa3dc009822c0e437f317864534feb">is_append_only</a> () const noexcept</td></tr>
<tr class="memdesc:ac3aa3dc009822c0e437f317864534feb"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is append only. <br /></td></tr>
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<tr class="memitem:a101620e9fff0c0e8c346af0e9de58b6a"><td class="memItemLeft" align="right" valign="top">virtual result< void > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a101620e9fff0c0e8c346af0e9de58b6a">set_append_only</a> (bool enable) noexcept</td></tr>
<tr class="memdesc:a101620e9fff0c0e8c346af0e9de58b6a"><td class="mdescLeft"> </td><td class="mdescRight">EXTENSION: Changes whether this handle is append only or not. <a href="classllfio__v2__xxx_1_1handle.html#a101620e9fff0c0e8c346af0e9de58b6a">More...</a><br /></td></tr>
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<tr class="memitem:ade2416b9154d1e56937c99cd514324f8"><td class="memItemLeft" align="right" valign="top"><a id="ade2416b9154d1e56937c99cd514324f8"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ade2416b9154d1e56937c99cd514324f8">is_multiplexable</a> () const noexcept</td></tr>
<tr class="memdesc:ade2416b9154d1e56937c99cd514324f8"><td class="mdescLeft"> </td><td class="mdescRight">True if multiplexable. <br /></td></tr>
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bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a501aa723172f6852e82738b0969278ae">is_nonblocking</a> () const noexcept</td></tr>
<tr class="memdesc:a501aa723172f6852e82738b0969278ae"><td class="mdescLeft"> </td><td class="mdescRight">True if nonblocking. <br /></td></tr>
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bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a695ce0ed1606d540cfa452790ea71632">is_seekable</a> () const noexcept</td></tr>
<tr class="memdesc:a695ce0ed1606d540cfa452790ea71632"><td class="mdescLeft"> </td><td class="mdescRight">True if seekable. <br /></td></tr>
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<tr class="memitem:a751e912d8dab755ea969a418c1d544eb"><td class="memItemLeft" align="right" valign="top"><a id="a751e912d8dab755ea969a418c1d544eb"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a751e912d8dab755ea969a418c1d544eb">requires_aligned_io</a> () const noexcept</td></tr>
<tr class="memdesc:a751e912d8dab755ea969a418c1d544eb"><td class="mdescLeft"> </td><td class="mdescRight">True if requires aligned i/o. <br /></td></tr>
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bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a7751fbb4b1aff527f469412ea33116ed">is_regular</a> () const noexcept</td></tr>
<tr class="memdesc:a7751fbb4b1aff527f469412ea33116ed"><td class="mdescLeft"> </td><td class="mdescRight">True if a regular file or device. <br /></td></tr>
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<tr class="memitem:a4ca48bdcd6d6bf8b41d0cebb304fe9ce"><td class="memItemLeft" align="right" valign="top"><a id="a4ca48bdcd6d6bf8b41d0cebb304fe9ce"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ca48bdcd6d6bf8b41d0cebb304fe9ce">is_directory</a> () const noexcept</td></tr>
<tr class="memdesc:a4ca48bdcd6d6bf8b41d0cebb304fe9ce"><td class="mdescLeft"> </td><td class="mdescRight">True if a directory. <br /></td></tr>
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<tr class="memitem:ae0d5de068f71628e9491c5669f89dca0"><td class="memItemLeft" align="right" valign="top"><a id="ae0d5de068f71628e9491c5669f89dca0"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ae0d5de068f71628e9491c5669f89dca0">is_symlink</a> () const noexcept</td></tr>
<tr class="memdesc:ae0d5de068f71628e9491c5669f89dca0"><td class="mdescLeft"> </td><td class="mdescRight">True if a symlink. <br /></td></tr>
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<tr class="memitem:ac52242425f6e71c3fddcb6cdbe2c3b4e"><td class="memItemLeft" align="right" valign="top"><a id="ac52242425f6e71c3fddcb6cdbe2c3b4e"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ac52242425f6e71c3fddcb6cdbe2c3b4e">is_pipe</a> () const noexcept</td></tr>
<tr class="memdesc:ac52242425f6e71c3fddcb6cdbe2c3b4e"><td class="mdescLeft"> </td><td class="mdescRight">True if a pipe. <br /></td></tr>
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<tr class="memitem:ac9280ab1e6f2a65bc73ee0cba5a8deea"><td class="memItemLeft" align="right" valign="top"><a id="ac9280ab1e6f2a65bc73ee0cba5a8deea"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ac9280ab1e6f2a65bc73ee0cba5a8deea">is_socket</a> () const noexcept</td></tr>
<tr class="memdesc:ac9280ab1e6f2a65bc73ee0cba5a8deea"><td class="mdescLeft"> </td><td class="mdescRight">True if a socket. <br /></td></tr>
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<tr class="memitem:a018de0f7c177e3cff239016d14582e9a"><td class="memItemLeft" align="right" valign="top"><a id="a018de0f7c177e3cff239016d14582e9a"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a018de0f7c177e3cff239016d14582e9a">is_multiplexer</a> () const noexcept</td></tr>
<tr class="memdesc:a018de0f7c177e3cff239016d14582e9a"><td class="mdescLeft"> </td><td class="mdescRight">True if a multiplexer like BSD kqueues, Linux epoll or Windows IOCP. <br /></td></tr>
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<tr class="memitem:ade0d0e05b844e77f425669da87bf48bb"><td class="memItemLeft" align="right" valign="top"><a id="ade0d0e05b844e77f425669da87bf48bb"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ade0d0e05b844e77f425669da87bf48bb">is_process</a> () const noexcept</td></tr>
<tr class="memdesc:ade0d0e05b844e77f425669da87bf48bb"><td class="mdescLeft"> </td><td class="mdescRight">True if a process. <br /></td></tr>
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<tr class="memitem:a354c9168af7759f7151a071c1e1b7b19"><td class="memItemLeft" align="right" valign="top"><a id="a354c9168af7759f7151a071c1e1b7b19"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a354c9168af7759f7151a071c1e1b7b19">is_section</a> () const noexcept</td></tr>
<tr class="memdesc:a354c9168af7759f7151a071c1e1b7b19"><td class="mdescLeft"> </td><td class="mdescRight">True if a memory section. <br /></td></tr>
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<tr class="memitem:a028fbead3b3c4d4eed2da7fa51c75036"><td class="memItemLeft" align="right" valign="top"><a id="a028fbead3b3c4d4eed2da7fa51c75036"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a028fbead3b3c4d4eed2da7fa51c75036">is_allocation</a> () const noexcept</td></tr>
<tr class="memdesc:a028fbead3b3c4d4eed2da7fa51c75036"><td class="mdescLeft"> </td><td class="mdescRight">True if a memory allocation. <br /></td></tr>
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<tr class="memitem:a90bf8668df002dac5a7d9397486b2946"><td class="memItemLeft" align="right" valign="top"><a id="a90bf8668df002dac5a7d9397486b2946"></a>
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a90bf8668df002dac5a7d9397486b2946">kernel_caching</a> () const noexcept</td></tr>
<tr class="memdesc:a90bf8668df002dac5a7d9397486b2946"><td class="mdescLeft"> </td><td class="mdescRight">Kernel cache strategy used by this handle. <br /></td></tr>
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bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a7126a726b2a06e4c1eca1a94c41163ff">are_reads_from_cache</a> () const noexcept</td></tr>
<tr class="memdesc:a7126a726b2a06e4c1eca1a94c41163ff"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle uses the kernel page cache for reads. <br /></td></tr>
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bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a8036792f332459064172d7b0cfaee3cf">are_writes_durable</a> () const noexcept</td></tr>
<tr class="memdesc:a8036792f332459064172d7b0cfaee3cf"><td class="mdescLeft"> </td><td class="mdescRight">True if writes are safely on storage on completion. <br /></td></tr>
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<tr class="memitem:a0a2a5896f5e373fa032cdae1c1fff2c1"><td class="memItemLeft" align="right" valign="top"><a id="a0a2a5896f5e373fa032cdae1c1fff2c1"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a0a2a5896f5e373fa032cdae1c1fff2c1">are_safety_barriers_issued</a> () const noexcept</td></tr>
<tr class="memdesc:a0a2a5896f5e373fa032cdae1c1fff2c1"><td class="mdescLeft"> </td><td class="mdescRight">True if issuing safety fsyncs is on. <br /></td></tr>
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flag </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a013936bc1254b1a47567fe29698d1b1c">flags</a> () const noexcept</td></tr>
<tr class="memdesc:a013936bc1254b1a47567fe29698d1b1c"><td class="mdescLeft"> </td><td class="mdescRight">The flags this handle was opened with. <br /></td></tr>
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<a class="el" href="structllfio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a942b0d276c9f20fe41baab679b88fe72">native_handle</a> () const noexcept</td></tr>
<tr class="memdesc:a942b0d276c9f20fe41baab679b88fe72"><td class="mdescLeft"> </td><td class="mdescRight">The native handle used by this handle. <br /></td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-static-methods"></a>
Static Protected Member Functions</h2></td></tr>
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static constexpr void </td><td class="memItemRight" valign="bottom"><b>_set_caching</b> (<a class="el" href="structllfio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> &nativeh, <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a> <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a>) noexcept</td></tr>
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Protected Attributes</h2></td></tr>
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<a class="el" href="structllfio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> </td><td class="memItemRight" valign="bottom"><b>_v</b></td></tr>
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<tr class="memitem:ad758cf1eb2e0b4c63583eab05e7f6820"><td class="memItemLeft" align="right" valign="top"><a id="ad758cf1eb2e0b4c63583eab05e7f6820"></a>
flag </td><td class="memItemRight" valign="bottom"><b>_flags</b> {flag::none}</td></tr>
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Friends</h2></td></tr>
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class </td><td class="memItemRight" valign="bottom"><b>fs_handle</b></td></tr>
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std::ostream & </td><td class="memItemRight" valign="bottom"><b>operator<<</b> (std::ostream &s, const <a class="el" href="classllfio__v2__xxx_1_1handle.html">handle</a> &v)</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>A native_handle_type which is managed by the lifetime of this object instance. </p>
</div><h2 class="groupheader">Member Enumeration Documentation</h2>
<a id="aecd3a7db6cee3aec07d32fe6f99e6852"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aecd3a7db6cee3aec07d32fe6f99e6852">◆ </a></span>caching</h2>
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<td class="memname">enum <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">llfio_v2_xxx::handle::caching</a> : unsigned char</td>
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<p>What i/o on the handle may complete immediately due to kernel caching. </p>
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<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="aecd3a7db6cee3aec07d32fe6f99e6852a334c4a4c42fdb79d7ebc3e73b517e6f8"></a>none </td><td class="fielddoc"><p>No caching whatsoever, all reads and writes come from storage (i.e. <code>O_DIRECT|O_SYNC</code>). Align all i/o to 4Kb boundaries for this to work. <code>disable_safety_barriers</code> can be used here. </p>
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<tr><td class="fieldname"><a id="aecd3a7db6cee3aec07d32fe6f99e6852ab8a61dd00ce6fc5888706bda8fab2e98"></a>only_metadata </td><td class="fielddoc"><p>Cache reads and writes of metadata but avoid caching data (<code>O_DIRECT</code>), thus i/o here does not affect other cached data for other handles. Align all i/o to 4Kb boundaries for this to work. </p>
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<tr><td class="fieldname"><a id="aecd3a7db6cee3aec07d32fe6f99e6852a0fb9cf5f04f61bb6f1151da57ceb1ca1"></a>reads </td><td class="fielddoc"><p>Cache reads only. Writes of data and metadata do not complete until reaching storage (<code>O_SYNC</code>). <code>disable_safety_barriers</code> can be used here. </p>
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<tr><td class="fieldname"><a id="aecd3a7db6cee3aec07d32fe6f99e6852adec4ecca8ae1593f84eea4656599a693"></a>reads_and_metadata </td><td class="fielddoc"><p>Cache reads and writes of metadata, but writes of data do not complete until reaching storage (<code>O_DSYNC</code>). <code>disable_safety_barriers</code> can be used here. </p>
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<tr><td class="fieldname"><a id="aecd3a7db6cee3aec07d32fe6f99e6852aa181a603769c1f98ad927e7367c7aa51"></a>all </td><td class="fielddoc"><p>Cache reads and writes of data and metadata so they complete immediately, sending writes to storage at some point when the kernel decides (this is the default file system caching on a system). </p>
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<tr><td class="fieldname"><a id="aecd3a7db6cee3aec07d32fe6f99e6852a9cd65f46f55fb6a4b198fcee6f0a63c1"></a>safety_barriers </td><td class="fielddoc"><p>Cache reads and writes of data and metadata so they complete immediately, but issue safety barriers at certain points. See documentation for <code>disable_safety_barriers</code>. </p>
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<tr><td class="fieldname"><a id="aecd3a7db6cee3aec07d32fe6f99e6852ad5197d93c063a2b1e22d1630a39b7aef"></a>temporary </td><td class="fielddoc"><p>Cache reads and writes of data and metadata so they complete immediately, only sending any updates to storage on last handle close in the system or if memory becomes tight as this file is expected to be temporary (Windows and FreeBSD only). </p>
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<div class="fragment"><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  : <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> <span class="comment">// bit 0 set means safety barriers enabled</span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  {</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  unchanged = 0,</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  none = 1, <span class="comment">//!< No caching whatsoever, all reads and writes come from storage (i.e. <tt>O_DIRECT|O_SYNC</tt>). Align all i/o to 4Kb boundaries for this to work. <tt>disable_safety_barriers</tt> can be used here.</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment"></span> only_metadata = 2, <span class="comment">//!< Cache reads and writes of metadata but avoid caching data (<tt>O_DIRECT</tt>), thus i/o here does not affect other cached data for other handles. Align all i/o to 4Kb boundaries for this to work.</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment"></span> reads = 3, <span class="comment">//!< Cache reads only. Writes of data and metadata do not complete until reaching storage (<tt>O_SYNC</tt>). <tt>disable_safety_barriers</tt> can be used here.</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="comment"></span> reads_and_metadata = 5, <span class="comment">//!< Cache reads and writes of metadata, but writes of data do not complete until reaching storage (<tt>O_DSYNC</tt>). <tt>disable_safety_barriers</tt> can be used here.</span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="comment"></span> all = 6, <span class="comment">//!< Cache reads and writes of data and metadata so they complete immediately, sending writes to storage at some point when the kernel decides (this is the default file system caching on a system).</span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="comment"></span> safety_barriers = 7, <span class="comment">//!< Cache reads and writes of data and metadata so they complete immediately, but issue safety barriers at certain points. See documentation for <tt>disable_safety_barriers</tt>.</span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment"></span> temporary = 8 <span class="comment">//!< Cache reads and writes of data and metadata so they complete immediately, only sending any updates to storage on last handle close in the system or if memory becomes tight as this file is expected to be temporary (Windows and FreeBSD only).</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="comment"></span> <span class="comment">// NOTE: IF UPDATING THIS UPDATE THE std::ostream PRINTER BELOW!!!</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  };</div>
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<h2 class="memtitle"><span class="permalink"><a href="#af0b352d0f273ba6fa70c178b2c2fee42">◆ </a></span>creation</h2>
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<td class="memname">enum <a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42">llfio_v2_xxx::handle::creation</a> : unsigned char</td>
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<p>On opening, do we also create a new file or truncate an existing one? </p>
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<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="af0b352d0f273ba6fa70c178b2c2fee42aa200dcd6176417e93be2405188ae7cc9"></a>open_existing </td><td class="fielddoc"><p>Filesystem entry must already exist. </p>
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<tr><td class="fieldname"><a id="af0b352d0f273ba6fa70c178b2c2fee42abba3bc579480e6c94ecd81b7b5923255"></a>only_if_not_exist </td><td class="fielddoc"><p>Filesystem entry must NOT exist, and is atomically created by the success of this operation. </p>
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<tr><td class="fieldname"><a id="af0b352d0f273ba6fa70c178b2c2fee42a8f0339e854eb5321306a443ce9199e1d"></a>if_needed </td><td class="fielddoc"><p>If filesystem entry exists that is used, else one is created. </p>
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<tr><td class="fieldname"><a id="af0b352d0f273ba6fa70c178b2c2fee42abb872caae430ba70f670508aca38feed"></a>truncate_existing </td><td class="fielddoc"><p>Filesystem entry must already exist. It is atomically truncated on open, leaving creation date and unique identifier unmodified. </p>
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<tr><td class="fieldname"><a id="af0b352d0f273ba6fa70c178b2c2fee42af7cf95e0f43dc8f79e39ae628c85a11d"></a>always_new </td><td class="fielddoc"><p>If filesystem entry exists, it is atomically replaced with a new inode, else a new entry is created. </p>
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<div class="fragment"><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  : <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  {</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  open_existing = 0, <span class="comment">//!< Filesystem entry must already exist</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment"></span> only_if_not_exist, <span class="comment">//!< Filesystem entry must NOT exist, and is atomically created by the success of this operation</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment"></span> if_needed, <span class="comment">//!< If filesystem entry exists that is used, else one is created</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"></span> truncate_existing, <span class="comment">//!< Filesystem entry must already exist. It is atomically truncated on open, leaving creation date and unique identifier unmodified.</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment"></span> always_new <span class="comment">//!< If filesystem entry exists, it is atomically replaced with a new inode, else a new entry is created.</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment"></span> <span class="comment">// NOTE: IF UPDATING THIS UPDATE THE std::ostream PRINTER BELOW!!!</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  };</div>
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<td class="memname">enum <a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dca">llfio_v2_xxx::handle::mode</a> : unsigned char</td>
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<p>The behaviour of the handle: does it read, read and write, or atomic append? </p>
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<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="aa3930273a2d4cabbac309e0b75701dcaa334c4a4c42fdb79d7ebc3e73b517e6f8"></a>none </td><td class="fielddoc"><p>No ability to read or write anything, but can synchronise (SYNCHRONIZE or 0) </p>
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<tr><td class="fieldname"><a id="aa3930273a2d4cabbac309e0b75701dcaaa4daf6d1e8da35af49c33bbe9ee91d79"></a>attr_read </td><td class="fielddoc"><p>Ability to read attributes (FILE_READ_ATTRIBUTES|SYNCHRONIZE or O_RDONLY) </p>
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<tr><td class="fieldname"><a id="aa3930273a2d4cabbac309e0b75701dcaa9f56aff64cb748e078ab221474132d19"></a>attr_write </td><td class="fielddoc"><p>Ability to read and write attributes (FILE_READ_ATTRIBUTES|FILE_WRITE_ATTRIBUTES|SYNCHRONIZE or O_RDONLY) </p>
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<tr><td class="fieldname"><a id="aa3930273a2d4cabbac309e0b75701dcaaecae13117d6f0584c25a9da6c8f8415e"></a>read </td><td class="fielddoc"><p>Ability to read (READ_CONTROL|FILE_READ_DATA|FILE_READ_ATTRIBUTES|FILE_READ_EA|SYNCHRONISE or O_RDONLY) </p>
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<tr><td class="fieldname"><a id="aa3930273a2d4cabbac309e0b75701dcaaefb2a684e4afb7d55e6147fbe5a332ee"></a>write </td><td class="fielddoc"><p>Ability to read and write (READ_CONTROL|FILE_READ_DATA|FILE_READ_ATTRIBUTES|FILE_READ_EA|FILE_WRITE_DATA|FILE_WRITE_ATTRIBUTES|FILE_WRITE_EA|FILE_APPEND_DATA|SYNCHRONISE or O_RDWR) </p>
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<tr><td class="fieldname"><a id="aa3930273a2d4cabbac309e0b75701dcaa9516dfb15f51c7ee19a4d46b8c0dbe1d"></a>append </td><td class="fielddoc"><p>All mainstream OSs and CIFS guarantee this is atomic with respect to all other appenders (FILE_APPEND_DATA|SYNCHRONISE or O_APPEND) </p>
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<div class="fragment"><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  : <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> <span class="comment">// bit 0 set means writable</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  {</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  unchanged = 0,</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  none = 2, <span class="comment">//!< No ability to read or write anything, but can synchronise (SYNCHRONIZE or 0)</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment"></span> attr_read = 4, <span class="comment">//!< Ability to read attributes (FILE_READ_ATTRIBUTES|SYNCHRONIZE or O_RDONLY)</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"></span> attr_write = 5, <span class="comment">//!< Ability to read and write attributes (FILE_READ_ATTRIBUTES|FILE_WRITE_ATTRIBUTES|SYNCHRONIZE or O_RDONLY)</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment"></span> <a class="code" href="namespacellfio__v2__xxx.html#af678f58d20e1f0962ff0744150342683">read</a> = 6, <span class="comment">//!< Ability to read (READ_CONTROL|FILE_READ_DATA|FILE_READ_ATTRIBUTES|FILE_READ_EA|SYNCHRONISE or O_RDONLY)</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment"></span> <a class="code" href="namespacellfio__v2__xxx.html#a5a8908704c9988bbecc69c2359e6fd4a">write</a> = 7, <span class="comment">//!< Ability to read and write (READ_CONTROL|FILE_READ_DATA|FILE_READ_ATTRIBUTES|FILE_READ_EA|FILE_WRITE_DATA|FILE_WRITE_ATTRIBUTES|FILE_WRITE_EA|FILE_APPEND_DATA|SYNCHRONISE or O_RDWR)</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment"></span> append = 9 <span class="comment">//!< All mainstream OSs and CIFS guarantee this is atomic with respect to all other appenders (FILE_APPEND_DATA|SYNCHRONISE or O_APPEND)</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment"></span> <span class="comment">// NOTE: IF UPDATING THIS UPDATE THE std::ostream PRINTER BELOW!!!</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  };</div>
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<h2 class="groupheader">Member Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#aeea4389189021b94dde6d8f2c3ccc5b3">◆ </a></span>clone()</h2>
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<td class="memname">result<<a class="el" href="classllfio__v2__xxx_1_1handle.html">handle</a>> llfio_v2_xxx::handle::clone </td>
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<p>Clone this handle (copy constructor is disabled to avoid accidental copying)</p>
<dl class="section user"><dt>Errors returnable\n Any of the values POSIX dup() or DuplicateHandle() can return.</dt><dd></dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a00a85eec5a41f7edb2c574d40cf04535">◆ </a></span>current_path()</h2>
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<td class="memname">virtual result<<a class="el" href="classllfio__v2__xxx_1_1handle.html#a33481bae57d9ccd0c97946416f9682f3">path_type</a>> llfio_v2_xxx::handle::current_path </td>
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<p>Returns the current path of the open handle as said by the operating system. Note that you are NOT guaranteed that any path refreshed bears any resemblance to the original, some operating systems will return some different path which still reaches the same inode via some other route e.g. hardlinks, dereferenced symbolic links, etc. Windows and Linux correctly track changes to the specific path the handle was opened with, not getting confused by other hard links. MacOS nearly gets it right, but under some circumstances e.g. renaming may switch to a different hard link's path which is almost certainly a bug.</p>
<p>If LLFIO was not able to determine the current path for this open handle e.g. the inode has been unlinked, it returns an empty path. Be aware that FreeBSD can return an empty (deleted) path for file inodes no longer cached by the kernel path cache, LLFIO cannot detect the difference. FreeBSD will also return any path leading to the inode if it is hard linked. FreeBSD does implement path retrieval for directory inodes correctly however, and see <code>algorithm::cached_parent_handle_adapter<T></code> for a handle adapter which makes use of that.</p>
<p>On Linux if <code>/proc</code> is not mounted, this call fails with an error. All APIs in LLFIO which require the use of <code>current_path()</code> can be told to not use it e.g. <code>flag::disable_safety_unlinks</code>. It is up to you to detect if <code>current_path()</code> is not working, and to change how you call LLFIO appropriately.</p>
<p>On Windows, you will almost certainly get back a path of the form <code>\!!\Device\HarddiskVolume10\Users\ned\...</code>. See <code>path_view</code> for what all the path prefix sequences mean, but to summarise the <code>\!!\</code> prefix is LLFIO-only and will not be accepted by other Windows APIs. Pass LLFIO derived paths through the function <code>to_win32_path()</code> to Win32-ise them. This function is also available on Linux where it does nothing, so you can use it in portable code.</p>
<dl class="section warning"><dt>Warning</dt><dd>This call is expensive, it always asks the kernel for the current path, and no checking is done to ensure what the kernel returns is accurate or even sensible. Be aware that despite these precautions, paths are unstable and <b>can change randomly at any moment</b>. Most code written to use absolute file systems paths is <b>racy</b>, so don't do it, use <code>path_handle</code> to fix a base location on the file system and work from that anchor instead!</dd></dl>
<dl class="section user"><dt>Memory Allocations\n At least one malloc for the path_type, likely several more.</dt><dd></dd></dl>
<dl class="section see"><dt>See also</dt><dd><code>algorithm::cached_parent_handle_adapter<T></code> which overrides this with an implementation based on retrieving the current path of a cached handle to the parent directory. On platforms with instability or failure to retrieve the correct current path for regular files, the cached parent handle adapter works around the problem by taking advantage of directory inodes not having the same instability problems on any platform. </dd></dl>
<p>Reimplemented in <a class="el" href="classllfio__v2__xxx_1_1symlink__handle.html#aea44ed050acfd8e4f9dec59ff194c746">llfio_v2_xxx::symlink_handle</a>, and <a class="el" href="classllfio__v2__xxx_1_1process__handle.html#a8ed1f5dda9dcf9d59710acc9c91df943">llfio_v2_xxx::process_handle</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ac5222904f116c9beb0515a4a5aa850bf">◆ </a></span>QUICKCPPLIB_BITFIELD_BEGIN()</h2>
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<td class="memname">llfio_v2_xxx::handle::QUICKCPPLIB_BITFIELD_BEGIN </td>
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<p>Bitwise flags which can be specified. </p>
<p>< No flags</p>
<p>Unlinks the file on handle close. On POSIX, this simply unlinks whatever is pointed to by <code>path()</code> upon the call of <code>close()</code> if and only if the inode matches. On Windows, if you are on Windows 10 1709 or later, exactly the same thing occurs. If on previous editions of Windows, the file entry does not disappears but becomes unavailable for anyone else to open with an <code>errc::resource_unavailable_try_again</code> error return. Because this is confusing, unless the <code>win_disable_unlink_emulation</code> flag is also specified, this POSIX behaviour is somewhat emulated by LLFIO on older Windows by renaming the file to a random name on <code>close()</code> causing it to appear to have been unlinked immediately.</p>
<p>Some kernel caching modes have unhelpfully inconsistent behaviours in getting your data onto storage, so by default unless this flag is specified LLFIO adds extra fsyncs to the following operations for the caching modes specified below: truncation of file length either explicitly or during file open. closing of the handle either explicitly or in the destructor.</p>
<p>Additionally on Linux only to prevent loss of file metadata: On the parent directory whenever a file might have been created. On the parent directory on file close.</p>
<p>This only occurs for these kernel caching modes: caching::none caching::reads caching::reads_and_metadata caching::safety_barriers</p>
<p><code>file_handle::unlink()</code> could accidentally delete the wrong file if someone has renamed the open file handle since the time it was opened. To prevent this occuring, where the OS doesn't provide race free unlink-by-open-handle we compare the inode of the path we are about to unlink with that of the open handle before unlinking. </p><dl class="section warning"><dt>Warning</dt><dd>This does not prevent races where in between the time of checking the inode and executing the unlink a third party changes the item about to be unlinked. Only operating systems with a true race-free unlink syscall are race free.</dd></dl>
<p>Ask the OS to disable prefetching of data. This can improve random i/o performance.</p>
<p>Ask the OS to maximise prefetching of data, possibly prefetching the entire file into kernel cache. This can improve sequential i/o performance.</p>
<p>< See the documentation for <code>unlink_on_first_close</code></p>
<p>Microsoft Windows NTFS, having been created in the late 1980s, did not originally implement extents-based storage and thus could only represent sparse files via efficient compression of intermediate zeros. With NTFS v3.0 (Microsoft Windows 2000), a proper extents-based on-storage representation was added, thus allowing only 64Kb extent chunks written to be stored irrespective of whatever the maximum file extent was set to.</p>
<p>For various historical reasons, extents-based storage is disabled by default in newly created files on NTFS, unlike in almost every other major filing system. You have to explicitly "opt in" to extents-based storage.</p>
<p>As extents-based storage is nearly cost free on NTFS, LLFIO by default opts in to extents-based storage for any empty file it creates. If you don't want this, you can specify this flag to prevent that happening.</p>
<p>Filesystems tend to be embarrassingly parallel for operations performed to different inodes. Where LLFIO performs i/o to multiple inodes at a time, it will use OpenMP or the Parallelism or Concurrency standard library extensions to usually complete the operation in constant rather than linear time. If you don't want this default, you can disable default using this flag.</p>
<p>Microsoft Windows NTFS has the option, when creating a directory, to set whether leafname lookup will be case sensitive. This is the only way of getting exact POSIX semantics on Windows without resorting to editing the system registry, however it also affects all code doing lookups within that directory, so we must default it to off.</p>
<p>Create the handle in a way where i/o upon it can be multiplexed with other i/o on the same initiating thread of execution i.e. you can perform more than one read concurrently, without using threads. The blocking operations <code>.read()</code> and <code>.write()</code> may have to use a less efficient, but cancellable, blocking implementation for handles created in this way. On Microsoft Windows, this creates handles with <code>OVERLAPPED</code> semantics. On POSIX, this creates handles with nonblocking semantics for non-file handles such as pipes and sockets, however for file, directory and symlink handles it does not set nonblocking, as it is non-portable.</p>
<p>< Using insane POSIX byte range locks</p>
<p>< This is an inode created with no representation on the filing system</p>
<div class="fragment"><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  {</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  none = 0, <span class="comment">//!< No flags</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment"></span><span class="comment"> /*! Unlinks the file on handle close. On POSIX, this simply unlinks whatever is pointed</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment"> to by `path()` upon the call of `close()` if and only if the inode matches. On Windows,</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment"> if you are on Windows 10 1709 or later, exactly the same thing occurs. If on previous</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="comment"> editions of Windows, the file entry does not disappears but becomes unavailable for</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="comment"> anyone else to open with an `errc::resource_unavailable_try_again` error return. Because this is confusing, unless the</span></div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="comment"> `win_disable_unlink_emulation` flag is also specified, this POSIX behaviour is</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="comment"> somewhat emulated by LLFIO on older Windows by renaming the file to a random name on `close()`</span></div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> <span class="comment"> causing it to appear to have been unlinked immediately.</span></div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  unlink_on_first_close = 1U << 0U,</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> <span class="comment"></span> </div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="comment"> /*! Some kernel caching modes have unhelpfully inconsistent behaviours</span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="comment"> in getting your data onto storage, so by default unless this flag is</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="comment"> specified LLFIO adds extra fsyncs to the following operations for the</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="comment"> caching modes specified below:</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="comment"> * truncation of file length either explicitly or during file open.</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="comment"> * closing of the handle either explicitly or in the destructor.</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="comment"></span> </div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="comment"> Additionally on Linux only to prevent loss of file metadata:</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> <span class="comment"> * On the parent directory whenever a file might have been created.</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="comment"> * On the parent directory on file close.</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <span class="comment"></span> </div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="comment"> This only occurs for these kernel caching modes:</span></div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="comment"> * caching::none</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> <span class="comment"> * caching::reads</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> <span class="comment"> * caching::reads_and_metadata</span></div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="comment"> * caching::safety_barriers</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  disable_safety_barriers = 1U << 2U,<span class="comment"></span></div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="comment"> /*! `file_handle::unlink()` could accidentally delete the wrong file if someone has</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="comment"> renamed the open file handle since the time it was opened. To prevent this occuring,</span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> <span class="comment"> where the OS doesn't provide race free unlink-by-open-handle we compare the inode of</span></div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="comment"> the path we are about to unlink with that of the open handle before unlinking.</span></div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> <span class="comment"> \warning This does not prevent races where in between the time of checking the inode</span></div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="comment"> and executing the unlink a third party changes the item about to be unlinked. Only</span></div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="comment"> operating systems with a true race-free unlink syscall are race free.</span></div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  disable_safety_unlinks = 1U << 3U,<span class="comment"></span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> <span class="comment"> /*! Ask the OS to disable prefetching of data. This can improve random</span></div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="comment"> i/o performance.</span></div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  disable_prefetching = 1U << 4U,<span class="comment"></span></div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="comment"> /*! Ask the OS to maximise prefetching of data, possibly prefetching the entire file</span></div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> <span class="comment"> into kernel cache. This can improve sequential i/o performance.</span></div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  maximum_prefetching = 1U << 5U,</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  </div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  win_disable_unlink_emulation = 1U << 24U, <span class="comment">//!< See the documentation for `unlink_on_first_close`</span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="comment"></span><span class="comment"> /*! Microsoft Windows NTFS, having been created in the late 1980s, did not originally</span></div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="comment"> implement extents-based storage and thus could only represent sparse files via</span></div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span> <span class="comment"> efficient compression of intermediate zeros. With NTFS v3.0 (Microsoft Windows 2000),</span></div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> <span class="comment"> a proper extents-based on-storage representation was added, thus allowing only 64Kb</span></div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> <span class="comment"> extent chunks written to be stored irrespective of whatever the maximum file extent</span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> <span class="comment"> was set to.</span></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> <span class="comment"></span> </div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> <span class="comment"> For various historical reasons, extents-based storage is disabled by default in newly</span></div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> <span class="comment"> created files on NTFS, unlike in almost every other major filing system. You have to</span></div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span> <span class="comment"> explicitly "opt in" to extents-based storage.</span></div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span> <span class="comment"></span> </div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span> <span class="comment"> As extents-based storage is nearly cost free on NTFS, LLFIO by default opts in to</span></div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span> <span class="comment"> extents-based storage for any empty file it creates. If you don't want this, you</span></div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> <span class="comment"> can specify this flag to prevent that happening.</span></div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  win_disable_sparse_file_creation = 1U << 25U,<span class="comment"></span></div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> <span class="comment"> /*! Filesystems tend to be embarrassingly parallel for operations performed to different</span></div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span> <span class="comment"> inodes. Where LLFIO performs i/o to multiple inodes at a time, it will use OpenMP or</span></div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span> <span class="comment"> the Parallelism or Concurrency standard library extensions to usually complete the</span></div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span> <span class="comment"> operation in constant rather than linear time. If you don't want this default, you can</span></div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span> <span class="comment"> disable default using this flag.</span></div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  disable_parallelism = 1U << 26U,<span class="comment"></span></div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> <span class="comment"> /*! Microsoft Windows NTFS has the option, when creating a directory, to set whether</span></div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span> <span class="comment"> leafname lookup will be case sensitive. This is the only way of getting exact POSIX</span></div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span> <span class="comment"> semantics on Windows without resorting to editing the system registry, however it also</span></div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span> <span class="comment"> affects all code doing lookups within that directory, so we must default it to off.</span></div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  win_create_case_sensitive_directory = 1U << 27U,</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> <span class="comment"></span> </div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span> <span class="comment"> /*! Create the handle in a way where i/o upon it can be multiplexed with other i/o</span></div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span> <span class="comment"> on the same initiating thread of execution i.e. you can perform more than one read</span></div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span> <span class="comment"> concurrently, without using threads. The blocking operations `.read()` and `.write()`</span></div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span> <span class="comment"> may have to use a less efficient, but cancellable, blocking implementation for handles created</span></div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span> <span class="comment"> in this way. On Microsoft Windows, this creates handles with `OVERLAPPED` semantics.</span></div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span> <span class="comment"> On POSIX, this creates handles with nonblocking semantics for non-file handles such</span></div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span> <span class="comment"> as pipes and sockets, however for file, directory and symlink handles it does not set</span></div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> <span class="comment"> nonblocking, as it is non-portable.</span></div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  multiplexable = 1U << 28U,</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  </div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  <span class="comment">// NOTE: IF UPDATING THIS UPDATE THE std::ostream PRINTER BELOW!!!</span></div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  </div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  byte_lock_insanity = 1U << 29U, <span class="comment">//!< Using insane POSIX byte range locks</span></div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span> <span class="comment"></span> anonymous_inode = 1U << 30U <span class="comment">//!< This is an inode created with no representation on the filing system</span></div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> <span class="comment"></span> } QUICKCPPLIB_BITFIELD_END(flag);</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a101620e9fff0c0e8c346af0e9de58b6a">◆ </a></span>set_append_only()</h2>
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<td class="memname">virtual result<void> llfio_v2_xxx::handle::set_append_only </td>
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<td class="paramtype">bool </td>
<td class="paramname"><em>enable</em></td><td>)</td>
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<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">virtual</span><span class="mlabel">noexcept</span></span> </td>
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<p>EXTENSION: Changes whether this handle is append only or not. </p>
<dl class="section warning"><dt>Warning</dt><dd>On Windows this is implemented as a bit of a hack to make it fast like on POSIX, so make sure you open the handle for read/write originally. Note unlike on POSIX the append_only disposition will be the only one toggled, seekable and readable will remain turned on.</dd></dl>
<dl class="section user"><dt>Errors returnable\n Whatever POSIX fcntl() returns. On Windows nothing is changed on the handle.</dt><dd></dd></dl>
<dl class="section user"><dt>Memory Allocations\n No memory allocation.</dt><dd></dd></dl>
<p>Reimplemented in <a class="el" href="classllfio__v2__xxx_1_1process__handle.html#ab64c9fc14fc555b5ec8571863458bf83">llfio_v2_xxx::process_handle</a>.</p>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li>include/llfio/v2.0/<a class="el" href="handle_8hpp.html">handle.hpp</a></li>
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<div class="ttc" id="anamespacellfio__v2__xxx_html_a5a8908704c9988bbecc69c2359e6fd4a"><div class="ttname"><a href="namespacellfio__v2__xxx.html#a5a8908704c9988bbecc69c2359e6fd4a">llfio_v2_xxx::write</a></div><div class="ttdeci">io_handle::io_result< io_handle::const_buffers_type > write(io_handle &self, io_handle::io_request< io_handle::const_buffers_type > reqs, deadline d=deadline()) noexcept</div><div class="ttdoc">Write data to the open handle.</div><div class="ttdef"><b>Definition:</b> io_handle.hpp:596</div></div>
<div class="ttc" id="anamespacellfio__v2__xxx_html_af678f58d20e1f0962ff0744150342683"><div class="ttname"><a href="namespacellfio__v2__xxx.html#af678f58d20e1f0962ff0744150342683">llfio_v2_xxx::read</a></div><div class="ttdeci">file_handle::io_result< file_handle::size_type > read(file_handle &self, file_handle::extent_type offset, std::initializer_list< file_handle::buffer_type > lst, deadline d=deadline()) noexcept</div><div class="ttdoc">This is an overloaded member function, provided for convenience. It differs from the above function o...</div><div class="ttdef"><b>Definition:</b> file_handle.hpp:479</div></div>
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