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<p>A handle to a source of mapped memory.
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1afio_1_1v2__xxx_1_1section__handle_1_1flag__base.html">flag_base</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">The behaviour of the memory section. <a href="structboost_1_1afio_1_1v2__xxx_1_1section__handle_1_1flag__base.html#details">More...</a><br/></td></tr>
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using </td><td class="memItemRight" valign="bottom"><b>extent_type</b> = <a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a617ab627aa596b325d7bfef5210a43f3">handle::extent_type</a></td></tr>
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using </td><td class="memItemRight" valign="bottom"><b>size_type</b> = <a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#aee8d98d7f979e312f5e18dfcebfc6870">handle::size_type</a></td></tr>
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using </td><td class="memItemRight" valign="bottom"><b>flag</b> = boost_lite::_faea95cc::bitfield::bitfield< <a class="el" href="structboost_1_1afio_1_1v2__xxx_1_1section__handle_1_1flag__base.html">flag_base</a> ></td></tr>
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<tr class="memitem:acd7f0c039e94c7ad40937fe32a2cabad"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#acd7f0c039e94c7ad40937fe32a2cabad">mode</a> : unsigned char { <br/>
  <b>unchanged</b> = 0,
<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#acd7f0c039e94c7ad40937fe32a2cabada334c4a4c42fdb79d7ebc3e73b517e6f8">none</a> = 2,
<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#acd7f0c039e94c7ad40937fe32a2cabadaa4daf6d1e8da35af49c33bbe9ee91d79">attr_read</a> = 4,
<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#acd7f0c039e94c7ad40937fe32a2cabada9f56aff64cb748e078ab221474132d19">attr_write</a> = 5,
<br/>
  <a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#acd7f0c039e94c7ad40937fe32a2cabadaecae13117d6f0584c25a9da6c8f8415e">read</a> = 6,
<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#acd7f0c039e94c7ad40937fe32a2cabadaefb2a684e4afb7d55e6147fbe5a332ee">write</a> = 7,
<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#acd7f0c039e94c7ad40937fe32a2cabada9516dfb15f51c7ee19a4d46b8c0dbe1d">append</a> = 9
<br/>
}</td></tr>
<tr class="memdesc:acd7f0c039e94c7ad40937fe32a2cabad"><td class="mdescLeft"> </td><td class="mdescRight">The behaviour of the handle: does it read, read and write, or atomic append? <a href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#acd7f0c039e94c7ad40937fe32a2cabad">More...</a><br/></td></tr>
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<tr class="memitem:ab7acaf4e9155f8ad4023813354de5357"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#ab7acaf4e9155f8ad4023813354de5357">creation</a> : unsigned char { <b>open_existing</b> = 0,
<b>only_if_not_exist</b>,
<b>if_needed</b>,
<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#ab7acaf4e9155f8ad4023813354de5357a244f58cf07c35fd48d7524b289551e5c">truncate</a>
}</td></tr>
<tr class="memdesc:ab7acaf4e9155f8ad4023813354de5357"><td class="mdescLeft"> </td><td class="mdescRight">On opening, do we also create a new file or truncate an existing one? <a href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#ab7acaf4e9155f8ad4023813354de5357">More...</a><br/></td></tr>
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<tr class="memitem:a81c7de194feaa88684ca9851d0d527ca"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a81c7de194feaa88684ca9851d0d527ca">caching</a> : unsigned char { <br/>
  <b>unchanged</b> = 0,
<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a81c7de194feaa88684ca9851d0d527caa334c4a4c42fdb79d7ebc3e73b517e6f8">none</a> = 1,
<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a81c7de194feaa88684ca9851d0d527caab8a61dd00ce6fc5888706bda8fab2e98">only_metadata</a> = 2,
<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a81c7de194feaa88684ca9851d0d527caa0fb9cf5f04f61bb6f1151da57ceb1ca1">reads</a> = 3,
<br/>
  <a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a81c7de194feaa88684ca9851d0d527caadec4ecca8ae1593f84eea4656599a693">reads_and_metadata</a> = 5,
<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a81c7de194feaa88684ca9851d0d527caaa181a603769c1f98ad927e7367c7aa51">all</a> = 4,
<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a81c7de194feaa88684ca9851d0d527caadfa4d35596e04e042a53c64b25c22db3">safety_fsyncs</a> = 7,
<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a81c7de194feaa88684ca9851d0d527caad5197d93c063a2b1e22d1630a39b7aef">temporary</a> = 6
<br/>
}</td></tr>
<tr class="memdesc:a81c7de194feaa88684ca9851d0d527ca"><td class="mdescLeft"> </td><td class="mdescRight">What i/o on the handle will complete immediately due to kernel caching. <a href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a81c7de194feaa88684ca9851d0d527ca">More...</a><br/></td></tr>
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<tr class="memitem:aa28b35a32f1292b6126a82bba20a2c90"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aa28b35a32f1292b6126a82bba20a2c90"></a>
using </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#aa28b35a32f1292b6126a82bba20a2c90">path_type</a> = fixme_path</td></tr>
<tr class="memdesc:aa28b35a32f1292b6126a82bba20a2c90"><td class="mdescLeft"> </td><td class="mdescRight">The path type used by this handle. <br/></td></tr>
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Public Member Functions</h2></td></tr>
<tr class="memitem:a4d11de5e7fe8fee158829a024c8fdda4"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a4d11de5e7fe8fee158829a024c8fdda4"></a>
 </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1section__handle.html#a4d11de5e7fe8fee158829a024c8fdda4">section_handle</a> ()</td></tr>
<tr class="memdesc:a4d11de5e7fe8fee158829a024c8fdda4"><td class="mdescLeft"> </td><td class="mdescRight">Default constructor. <br/></td></tr>
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<tr class="memitem:af17b4f0410fa9dbe6d551d7a255b6d42"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="af17b4f0410fa9dbe6d551d7a255b6d42"></a>
 </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1section__handle.html#af17b4f0410fa9dbe6d551d7a255b6d42">section_handle</a> (<a class="el" href="structboost_1_1afio_1_1v2__xxx_1_1native__handle__type.html">native_handle_type</a> sectionh, <a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1io__handle.html">io_handle</a> *backing, <a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a617ab627aa596b325d7bfef5210a43f3">extent_type</a> maximum_size, flag __flag)</td></tr>
<tr class="memdesc:af17b4f0410fa9dbe6d551d7a255b6d42"><td class="mdescLeft"> </td><td class="mdescRight">Construct a section handle using the given native handle type for the section and the given i/o handle for the backing storage. <br/></td></tr>
<tr class="separator:af17b4f0410fa9dbe6d551d7a255b6d42"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aac2ebb1d0f361f4178bb5802598f0234"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aac2ebb1d0f361f4178bb5802598f0234"></a>
 </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1section__handle.html#aac2ebb1d0f361f4178bb5802598f0234">section_handle</a> (<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1section__handle.html">section_handle</a> &&o) noexcept</td></tr>
<tr class="memdesc:aac2ebb1d0f361f4178bb5802598f0234"><td class="mdescLeft"> </td><td class="mdescRight">Implicit move construction of section_handle permitted. <br/></td></tr>
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<tr class="memitem:a4b8a67f1d2da5bb2123da30835b0f894"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a4b8a67f1d2da5bb2123da30835b0f894"></a>
<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1section__handle.html">section_handle</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1section__handle.html#a4b8a67f1d2da5bb2123da30835b0f894">operator=</a> (<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1section__handle.html">section_handle</a> &&o) noexcept</td></tr>
<tr class="memdesc:a4b8a67f1d2da5bb2123da30835b0f894"><td class="mdescLeft"> </td><td class="mdescRight">Move assignment of section_handle permitted. <br/></td></tr>
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<tr class="memitem:ae0e0965229c5c6486352867c4284bffe"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ae0e0965229c5c6486352867c4284bffe"></a>
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1section__handle.html#ae0e0965229c5c6486352867c4284bffe">swap</a> (<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1section__handle.html">section_handle</a> &o) noexcept</td></tr>
<tr class="memdesc:ae0e0965229c5c6486352867c4284bffe"><td class="mdescLeft"> </td><td class="mdescRight">Swap with another instance. <br/></td></tr>
<tr class="separator:ae0e0965229c5c6486352867c4284bffe"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a049964a4397f858e9b1be60c60113b13"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a049964a4397f858e9b1be60c60113b13"></a>
flag </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1section__handle.html#a049964a4397f858e9b1be60c60113b13">section_flags</a> () const noexcept</td></tr>
<tr class="memdesc:a049964a4397f858e9b1be60c60113b13"><td class="mdescLeft"> </td><td class="mdescRight">Returns the memory section's flags. <br/></td></tr>
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<tr class="memitem:a78fc51ac881ae0fc42327de1f9604ee7"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a78fc51ac881ae0fc42327de1f9604ee7"></a>
<a class="el" href="structboost_1_1afio_1_1v2__xxx_1_1native__handle__type.html">native_handle_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1section__handle.html#a78fc51ac881ae0fc42327de1f9604ee7">backing_native_handle</a> () const noexcept</td></tr>
<tr class="memdesc:a78fc51ac881ae0fc42327de1f9604ee7"><td class="mdescLeft"> </td><td class="mdescRight">Returns the borrowed native handle backing this section, if any. <br/></td></tr>
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<tr class="memitem:aeb4ddb14354a7098f3d8d5e351095570"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aeb4ddb14354a7098f3d8d5e351095570"></a>
<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a617ab627aa596b325d7bfef5210a43f3">extent_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1section__handle.html#aeb4ddb14354a7098f3d8d5e351095570">length</a> () const noexcept</td></tr>
<tr class="memdesc:aeb4ddb14354a7098f3d8d5e351095570"><td class="mdescLeft"> </td><td class="mdescRight">Return the current maximum permitted extent of the memory section. <br/></td></tr>
<tr class="separator:aeb4ddb14354a7098f3d8d5e351095570"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a5a4ed3e38634ee4378133c7ccbb882d6"><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceboost_1_1afio_1_1v2__xxx.html#ac8d06ecaa9660e7251c1251d88c1305c">result</a>< <a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a617ab627aa596b325d7bfef5210a43f3">extent_type</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1section__handle.html#a5a4ed3e38634ee4378133c7ccbb882d6">truncate</a> (<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a617ab627aa596b325d7bfef5210a43f3">extent_type</a> newsize) noexcept</td></tr>
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<tr class="memitem:a461355ae526806b338fd2eaadc564a43"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a461355ae526806b338fd2eaadc564a43"></a>
virtual <a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#aa28b35a32f1292b6126a82bba20a2c90">path_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a461355ae526806b338fd2eaadc564a43">path</a> () const noexcept</td></tr>
<tr class="memdesc:a461355ae526806b338fd2eaadc564a43"><td class="mdescLeft"> </td><td class="mdescRight">The path this handle refers to, if any. <br/></td></tr>
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<tr class="memitem:a651ff10099e7522df784507aca8b8f0f"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a651ff10099e7522df784507aca8b8f0f"></a>
virtual <a class="el" href="namespaceboost_1_1afio_1_1v2__xxx.html#ac8d06ecaa9660e7251c1251d88c1305c">result</a>< void > </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a651ff10099e7522df784507aca8b8f0f">close</a> () noexcept</td></tr>
<tr class="memdesc:a651ff10099e7522df784507aca8b8f0f"><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:a59c9bc1338196095a028b2870dcfb61d"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a59c9bc1338196095a028b2870dcfb61d"></a>
virtual <a class="el" href="structboost_1_1afio_1_1v2__xxx_1_1native__handle__type.html">native_handle_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a59c9bc1338196095a028b2870dcfb61d">release</a> () noexcept</td></tr>
<tr class="memdesc:a59c9bc1338196095a028b2870dcfb61d"><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:a72da822cb2e7c406aaa40be0f44b16fa"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a72da822cb2e7c406aaa40be0f44b16fa"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a72da822cb2e7c406aaa40be0f44b16fa">is_valid</a> () const noexcept</td></tr>
<tr class="memdesc:a72da822cb2e7c406aaa40be0f44b16fa"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is valid (and usually open) <br/></td></tr>
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<tr class="memitem:af2d9387a79e320e2902880fee38b392a"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="af2d9387a79e320e2902880fee38b392a"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#af2d9387a79e320e2902880fee38b392a">is_readable</a> () const noexcept</td></tr>
<tr class="memdesc:af2d9387a79e320e2902880fee38b392a"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is readable. <br/></td></tr>
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<tr class="memitem:ac847865f7370c00ca1e7d0b2ac8ee4e7"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ac847865f7370c00ca1e7d0b2ac8ee4e7"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#ac847865f7370c00ca1e7d0b2ac8ee4e7">is_writable</a> () const noexcept</td></tr>
<tr class="memdesc:ac847865f7370c00ca1e7d0b2ac8ee4e7"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is writable. <br/></td></tr>
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<tr class="memitem:abef3375ff35a72bd780cbee0b600b26d"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="abef3375ff35a72bd780cbee0b600b26d"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#abef3375ff35a72bd780cbee0b600b26d">is_append_only</a> () const noexcept</td></tr>
<tr class="memdesc:abef3375ff35a72bd780cbee0b600b26d"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is append only. <br/></td></tr>
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<tr class="memitem:adf964e787e0666fc5b7d94c2715ee6f5"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="namespaceboost_1_1afio_1_1v2__xxx.html#ac8d06ecaa9660e7251c1251d88c1305c">result</a>< void > </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#adf964e787e0666fc5b7d94c2715ee6f5">set_append_only</a> (bool enable) noexcept</td></tr>
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<tr class="memitem:a8d4b2f3b095a80e651c18143246ee4e9"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a8d4b2f3b095a80e651c18143246ee4e9"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a8d4b2f3b095a80e651c18143246ee4e9">is_overlapped</a> () const noexcept</td></tr>
<tr class="memdesc:a8d4b2f3b095a80e651c18143246ee4e9"><td class="mdescLeft"> </td><td class="mdescRight">True if overlapped. <br/></td></tr>
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<tr class="memitem:a3c14ec910a3eac02b44688807c9b7511"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a3c14ec910a3eac02b44688807c9b7511"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a3c14ec910a3eac02b44688807c9b7511">is_seekable</a> () const noexcept</td></tr>
<tr class="memdesc:a3c14ec910a3eac02b44688807c9b7511"><td class="mdescLeft"> </td><td class="mdescRight">True if seekable. <br/></td></tr>
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<tr class="memitem:a7d1fa70986dc1edea222e17fbabc6425"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a7d1fa70986dc1edea222e17fbabc6425"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a7d1fa70986dc1edea222e17fbabc6425">requires_aligned_io</a> () const noexcept</td></tr>
<tr class="memdesc:a7d1fa70986dc1edea222e17fbabc6425"><td class="mdescLeft"> </td><td class="mdescRight">True if requires aligned i/o. <br/></td></tr>
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<tr class="memitem:a81b36f2dcb205e049f3c3781c7973b6e"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a81b36f2dcb205e049f3c3781c7973b6e"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a81b36f2dcb205e049f3c3781c7973b6e">is_regular</a> () const noexcept</td></tr>
<tr class="memdesc:a81b36f2dcb205e049f3c3781c7973b6e"><td class="mdescLeft"> </td><td class="mdescRight">True if a regular file or device. <br/></td></tr>
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<tr class="memitem:a75d78e5591cafbc68e8ba4e2b2deffa9"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a75d78e5591cafbc68e8ba4e2b2deffa9"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a75d78e5591cafbc68e8ba4e2b2deffa9">is_directory</a> () const noexcept</td></tr>
<tr class="memdesc:a75d78e5591cafbc68e8ba4e2b2deffa9"><td class="mdescLeft"> </td><td class="mdescRight">True if a directory. <br/></td></tr>
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<tr class="memitem:a6aa861f1403424bf5768d6dd25da402f"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a6aa861f1403424bf5768d6dd25da402f"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a6aa861f1403424bf5768d6dd25da402f">is_symlink</a> () const noexcept</td></tr>
<tr class="memdesc:a6aa861f1403424bf5768d6dd25da402f"><td class="mdescLeft"> </td><td class="mdescRight">True if a symlink. <br/></td></tr>
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<tr class="memitem:ad6cbdfbe64d09ec03829144a137bc865"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ad6cbdfbe64d09ec03829144a137bc865"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#ad6cbdfbe64d09ec03829144a137bc865">is_multiplexer</a> () const noexcept</td></tr>
<tr class="memdesc:ad6cbdfbe64d09ec03829144a137bc865"><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:a3460c3419d165c7d9e8aaee8db3c7f2c"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a3460c3419d165c7d9e8aaee8db3c7f2c"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a3460c3419d165c7d9e8aaee8db3c7f2c">is_process</a> () const noexcept</td></tr>
<tr class="memdesc:a3460c3419d165c7d9e8aaee8db3c7f2c"><td class="mdescLeft"> </td><td class="mdescRight">True if a process. <br/></td></tr>
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<tr class="memitem:a75bedfc2b14073a20ac359edc29f9cc9"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a75bedfc2b14073a20ac359edc29f9cc9"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a75bedfc2b14073a20ac359edc29f9cc9">is_section</a> () const noexcept</td></tr>
<tr class="memdesc:a75bedfc2b14073a20ac359edc29f9cc9"><td class="mdescLeft"> </td><td class="mdescRight">True if a memory section. <br/></td></tr>
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<tr class="memitem:ad4ee22cfec00551e1f71ff23962280be"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ad4ee22cfec00551e1f71ff23962280be"></a>
<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a81c7de194feaa88684ca9851d0d527ca">caching</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#ad4ee22cfec00551e1f71ff23962280be">kernel_caching</a> () const noexcept</td></tr>
<tr class="memdesc:ad4ee22cfec00551e1f71ff23962280be"><td class="mdescLeft"> </td><td class="mdescRight">Kernel cache strategy used by this handle. <br/></td></tr>
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<tr class="memitem:a70998344e2234961c5ad64491d042ff8"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a70998344e2234961c5ad64491d042ff8"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a70998344e2234961c5ad64491d042ff8">are_reads_from_cache</a> () const noexcept</td></tr>
<tr class="memdesc:a70998344e2234961c5ad64491d042ff8"><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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<tr class="memitem:ae446e9a32283991f58f8f27dbed083d1"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ae446e9a32283991f58f8f27dbed083d1"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#ae446e9a32283991f58f8f27dbed083d1">are_writes_durable</a> () const noexcept</td></tr>
<tr class="memdesc:ae446e9a32283991f58f8f27dbed083d1"><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:a3e08545dd29f09a40ff8439ac774ae1e"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a3e08545dd29f09a40ff8439ac774ae1e"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a3e08545dd29f09a40ff8439ac774ae1e">are_safety_fsyncs_issued</a> () const noexcept</td></tr>
<tr class="memdesc:a3e08545dd29f09a40ff8439ac774ae1e"><td class="mdescLeft"> </td><td class="mdescRight">True if issuing safety fsyncs is on. <br/></td></tr>
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<tr class="memitem:aa8de6675205db68de70bf9075a6c649f"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="namespaceboost_1_1afio_1_1v2__xxx.html#ac8d06ecaa9660e7251c1251d88c1305c">result</a>< void > </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#aa8de6675205db68de70bf9075a6c649f">set_kernel_caching</a> (<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a81c7de194feaa88684ca9851d0d527ca">caching</a> <a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a81c7de194feaa88684ca9851d0d527ca">caching</a>) noexcept</td></tr>
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<tr class="memitem:add27fa17cd6356b49a26a8b6dafb6a6d"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="add27fa17cd6356b49a26a8b6dafb6a6d"></a>
flag </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#add27fa17cd6356b49a26a8b6dafb6a6d">flags</a> () const noexcept</td></tr>
<tr class="memdesc:add27fa17cd6356b49a26a8b6dafb6a6d"><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="structboost_1_1afio_1_1v2__xxx_1_1native__handle__type.html">native_handle_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#ae600069dc662d837c36f42802791c7f4">native_handle</a> () const noexcept</td></tr>
<tr class="memdesc:ae600069dc662d837c36f42802791c7f4"><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="pub-static-methods"></a>
Static Public Member Functions</h2></td></tr>
<tr class="memitem:a09eab0e7e479b3c3a07a57567ae3e354"><td class="memItemLeft" align="right" valign="top">static <a class="el" href="namespaceboost_1_1afio_1_1v2__xxx.html#ac8d06ecaa9660e7251c1251d88c1305c">result</a>< <a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1section__handle.html">section_handle</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1section__handle.html#a09eab0e7e479b3c3a07a57567ae3e354">section</a> (<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1file__handle.html">file_handle</a> &backing, <a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a617ab627aa596b325d7bfef5210a43f3">extent_type</a> maximum_size=0, flag _flag=flag::read|flag::write) noexcept</td></tr>
<tr class="memdesc:a09eab0e7e479b3c3a07a57567ae3e354"><td class="mdescLeft"> </td><td class="mdescRight">Create a memory section. <a href="#a09eab0e7e479b3c3a07a57567ae3e354">More...</a><br/></td></tr>
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<tr class="memitem:a2ce0e07e5e48578bae21dcaafbaf033a"><td class="memItemLeft" align="right" valign="top">static <a class="el" href="namespaceboost_1_1afio_1_1v2__xxx.html#ac8d06ecaa9660e7251c1251d88c1305c">result</a>< <a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1section__handle.html">section_handle</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1section__handle.html#a2ce0e07e5e48578bae21dcaafbaf033a">section</a> (<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a617ab627aa596b325d7bfef5210a43f3">extent_type</a> maximum_size, <a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1file__handle.html">file_handle</a> &backing, flag _flag=flag::read|flag::write) noexcept</td></tr>
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Protected Attributes</h2></td></tr>
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<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1io__handle.html">io_handle</a> * </td><td class="memItemRight" valign="bottom"><b>_backing</b></td></tr>
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<tr class="memitem:a62a912a33ba00b6e4a6536d15af260e4"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a62a912a33ba00b6e4a6536d15af260e4"></a>
<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a617ab627aa596b325d7bfef5210a43f3">extent_type</a> </td><td class="memItemRight" valign="bottom"><b>_length</b></td></tr>
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<tr class="memitem:abe273f17a7504e8247846f3b300df9d1"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="abe273f17a7504e8247846f3b300df9d1"></a>
flag </td><td class="memItemRight" valign="bottom"><b>_flag</b></td></tr>
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<tr class="memitem:ae19418f14d1dd86e75214eda7644d42f"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ae19418f14d1dd86e75214eda7644d42f"></a>
<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a81c7de194feaa88684ca9851d0d527ca">caching</a> </td><td class="memItemRight" valign="bottom"><b>_caching</b></td></tr>
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flag </td><td class="memItemRight" valign="bottom"><b>_flags</b></td></tr>
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<tr class="memitem:a8d3193d192d5de93d3ea781b93ea398b"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a8d3193d192d5de93d3ea781b93ea398b"></a>
<a class="el" href="structboost_1_1afio_1_1v2__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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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>A handle to a source of mapped memory. </p>
<dl class="section note"><dt>Note</dt><dd>On Windows the native handle of this handle is that of the NT kernel section object. On POSIX it is a cloned file descriptor of the backing storage. </dd></dl>
</div><h2 class="groupheader">Member Enumeration Documentation</h2>
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<td class="memname">enum <a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a81c7de194feaa88684ca9851d0d527ca">boost::afio::v2_xxx::handle::caching</a> : unsigned char</td>
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<span class="mlabels"><span class="mlabel">inherited</span></span> </td>
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<p>What i/o on the handle will complete immediately due to kernel caching. </p>
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<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><em><a class="anchor" id="a81c7de194feaa88684ca9851d0d527caa334c4a4c42fdb79d7ebc3e73b517e6f8"></a>none</em> </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>flag_disable_safety_fsyncs</code> can be used here. </p>
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<tr><td class="fieldname"><em><a class="anchor" id="a81c7de194feaa88684ca9851d0d527caab8a61dd00ce6fc5888706bda8fab2e98"></a>only_metadata</em> </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"><em><a class="anchor" id="a81c7de194feaa88684ca9851d0d527caa0fb9cf5f04f61bb6f1151da57ceb1ca1"></a>reads</em> </td><td class="fielddoc">
<p>Cache reads only. Writes of data and metadata do not complete until reaching storage (<code>O_SYNC</code>). <code>flag_disable_safety_fsyncs</code> can be used here. </p>
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<tr><td class="fieldname"><em><a class="anchor" id="a81c7de194feaa88684ca9851d0d527caadec4ecca8ae1593f84eea4656599a693"></a>reads_and_metadata</em> </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>flag_disable_safety_fsyncs</code> can be used here. </p>
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<tr><td class="fieldname"><em><a class="anchor" id="a81c7de194feaa88684ca9851d0d527caaa181a603769c1f98ad927e7367c7aa51"></a>all</em> </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"><em><a class="anchor" id="a81c7de194feaa88684ca9851d0d527caadfa4d35596e04e042a53c64b25c22db3"></a>safety_fsyncs</em> </td><td class="fielddoc">
<p>Cache reads and writes of data and metadata so they complete immediately, but issue safety fsyncs at certain points. See documentation for <code>flag_disable_safety_fsyncs</code>. </p>
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<tr><td class="fieldname"><em><a class="anchor" id="a81c7de194feaa88684ca9851d0d527caad5197d93c063a2b1e22d1630a39b7aef"></a>temporary</em> </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 only). </p>
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<div class="fragment"><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  : <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> <span class="comment">// bit 0 set means safety fsyncs enabled</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  {</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  unchanged = 0,</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <a class="code" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#acd7f0c039e94c7ad40937fe32a2cabada334c4a4c42fdb79d7ebc3e73b517e6f8" title="No ability to read or write anything, but can synchronise (SYNCHRONIZE or 0)">none</a> = 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>flag_disable_safety_fsyncs</tt> can be used here.</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment"></span> <a class="code" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a81c7de194feaa88684ca9851d0d527caab8a61dd00ce6fc5888706bda8fab2e98" title="Cache reads and writes of metadata but avoid caching data (O_DIRECT), thus i/o here does not affect o...">only_metadata</a> = 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="l00092"></a><span class="lineno"> 92</span> <span class="comment"></span> <a class="code" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a81c7de194feaa88684ca9851d0d527caa0fb9cf5f04f61bb6f1151da57ceb1ca1" title="Cache reads only. Writes of data and metadata do not complete until reaching storage (O_SYNC)...">reads</a> = 3, <span class="comment">//!< Cache reads only. Writes of data and metadata do not complete until reaching storage (<tt>O_SYNC</tt>). <tt>flag_disable_safety_fsyncs</tt> can be used here.</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment"></span> <a class="code" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a81c7de194feaa88684ca9851d0d527caadec4ecca8ae1593f84eea4656599a693" title="Cache reads and writes of metadata, but writes of data do not complete until reaching storage (O_DSYN...">reads_and_metadata</a> = 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>flag_disable_safety_fsyncs</tt> can be used here.</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="comment"></span> <a class="code" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a81c7de194feaa88684ca9851d0d527caaa181a603769c1f98ad927e7367c7aa51" title="Cache reads and writes of data and metadata so they complete immediately, sending writes to storage a...">all</a> = 4, <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="l00095"></a><span class="lineno"> 95</span> <span class="comment"></span> <a class="code" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a81c7de194feaa88684ca9851d0d527caadfa4d35596e04e042a53c64b25c22db3" title="Cache reads and writes of data and metadata so they complete immediately, but issue safety fsyncs at ...">safety_fsyncs</a> = 7, <span class="comment">//!< Cache reads and writes of data and metadata so they complete immediately, but issue safety fsyncs at certain points. See documentation for <tt>flag_disable_safety_fsyncs</tt>.</span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="comment"></span> <a class="code" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a81c7de194feaa88684ca9851d0d527caad5197d93c063a2b1e22d1630a39b7aef" title="Cache reads and writes of data and metadata so they complete immediately, only sending any updates to...">temporary</a> = 6 <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 only).</span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</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="l00098"></a><span class="lineno"> 98</span>  };</div>
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<td class="memname">enum <a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#ab7acaf4e9155f8ad4023813354de5357">boost::afio::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"><em><a class="anchor" id="ab7acaf4e9155f8ad4023813354de5357a244f58cf07c35fd48d7524b289551e5c"></a>truncate</em> </td><td class="fielddoc">
<p>Atomically truncate on open, leaving creation date unmodified. </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,</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  only_if_not_exist,</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  if_needed,</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <a class="code" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#ab7acaf4e9155f8ad4023813354de5357a244f58cf07c35fd48d7524b289551e5c" title="Atomically truncate on open, leaving creation date unmodified.">truncate</a> <span class="comment">//!< Atomically truncate on open, leaving creation date unmodified.</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</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="l00085"></a><span class="lineno"> 85</span>  };</div>
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<td class="memname">enum <a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#acd7f0c039e94c7ad40937fe32a2cabad">boost::afio::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"><em><a class="anchor" id="acd7f0c039e94c7ad40937fe32a2cabada334c4a4c42fdb79d7ebc3e73b517e6f8"></a>none</em> </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"><em><a class="anchor" id="acd7f0c039e94c7ad40937fe32a2cabadaa4daf6d1e8da35af49c33bbe9ee91d79"></a>attr_read</em> </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"><em><a class="anchor" id="acd7f0c039e94c7ad40937fe32a2cabada9f56aff64cb748e078ab221474132d19"></a>attr_write</em> </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"><em><a class="anchor" id="acd7f0c039e94c7ad40937fe32a2cabadaecae13117d6f0584c25a9da6c8f8415e"></a>read</em> </td><td class="fielddoc">
<p>Ability to read (READ_CONTROL|FILE_READ_DATA|FILE_READ_ATTRIBUTES|FILE_READ_EA|SYNCHRONISE or O_RDONLY) </p>
</td></tr>
<tr><td class="fieldname"><em><a class="anchor" id="acd7f0c039e94c7ad40937fe32a2cabadaefb2a684e4afb7d55e6147fbe5a332ee"></a>write</em> </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"><em><a class="anchor" id="acd7f0c039e94c7ad40937fe32a2cabada9516dfb15f51c7ee19a4d46b8c0dbe1d"></a>append</em> </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>  <a class="code" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#acd7f0c039e94c7ad40937fe32a2cabada334c4a4c42fdb79d7ebc3e73b517e6f8" title="No ability to read or write anything, but can synchronise (SYNCHRONIZE or 0)">none</a> = 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> <a class="code" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#acd7f0c039e94c7ad40937fe32a2cabadaa4daf6d1e8da35af49c33bbe9ee91d79" title="Ability to read attributes (FILE_READ_ATTRIBUTES|SYNCHRONIZE or O_RDONLY)">attr_read</a> = 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> <a class="code" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#acd7f0c039e94c7ad40937fe32a2cabada9f56aff64cb748e078ab221474132d19" title="Ability to read and write attributes (FILE_READ_ATTRIBUTES|FILE_WRITE_ATTRIBUTES|SYNCHRONIZE or O_RDO...">attr_write</a> = 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="classboost_1_1afio_1_1v2__xxx_1_1handle.html#acd7f0c039e94c7ad40937fe32a2cabadaecae13117d6f0584c25a9da6c8f8415e" title="Ability to read (READ_CONTROL|FILE_READ_DATA|FILE_READ_ATTRIBUTES|FILE_READ_EA|SYNCHRONISE or O_RDONL...">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="classboost_1_1afio_1_1v2__xxx_1_1handle.html#acd7f0c039e94c7ad40937fe32a2cabadaefb2a684e4afb7d55e6147fbe5a332ee" title="Ability to read and write (READ_CONTROL|FILE_READ_DATA|FILE_READ_ATTRIBUTES|FILE_READ_EA|FILE_WRITE_D...">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> <a class="code" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#acd7f0c039e94c7ad40937fe32a2cabada9516dfb15f51c7ee19a4d46b8c0dbe1d" title="All mainstream OSs and CIFS guarantee this is atomic with respect to all other appenders (FILE_APPEND...">append</a> = 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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</div>
<h2 class="groupheader">Member Function Documentation</h2>
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<td>(</td>
<td class="paramtype"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1file__handle.html">file_handle</a> & </td>
<td class="paramname"><em>backing</em>, </td>
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<td class="paramtype"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a617ab627aa596b325d7bfef5210a43f3">extent_type</a> </td>
<td class="paramname"><em>maximum_size</em> = <code>0</code>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">flag </td>
<td class="paramname"><em>_flag</em> = <code>flag::read|flag::write</code> </td>
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<td>)</td>
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<p>Create a memory section. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">backing</td><td>The handle to use as backing storage. An invalid handle means to use the system page file as the backing storage. </td></tr>
<tr><td class="paramname">maximum_size</td><td>The maximum size this section can ever be. Zero means to use backing.length(). </td></tr>
<tr><td class="paramname">_flag</td><td>How to create the section.</td></tr>
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</dd>
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<dl class="section user"><dt>Errors returnable</dt><dd>Any of the values POSIX dup() or NtCreateSection() can return. </dd></dl>
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<td class="memname">static <a class="el" href="namespaceboost_1_1afio_1_1v2__xxx.html#ac8d06ecaa9660e7251c1251d88c1305c">result</a><<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1section__handle.html">section_handle</a>> boost::afio::v2_xxx::section_handle::section </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a617ab627aa596b325d7bfef5210a43f3">extent_type</a> </td>
<td class="paramname"><em>maximum_size</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1file__handle.html">file_handle</a> & </td>
<td class="paramname"><em>backing</em>, </td>
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<td class="paramtype">flag </td>
<td class="paramname"><em>_flag</em> = <code>flag::read | flag::write</code> </td>
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<p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
<div class="fragment"><div class="line"><a name="l00128"></a><span class="lineno"> 128</span> { <span class="keywordflow">return</span> <a class="code" href="classboost_1_1afio_1_1v2__xxx_1_1section__handle.html#a09eab0e7e479b3c3a07a57567ae3e354" title="Create a memory section.">section</a>(backing, maximum_size, _flag); }</div>
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<td class="memname">virtual <a class="el" href="namespaceboost_1_1afio_1_1v2__xxx.html#ac8d06ecaa9660e7251c1251d88c1305c">result</a><void> boost::afio::v2_xxx::handle::set_append_only </td>
<td>(</td>
<td class="paramtype">bool </td>
<td class="paramname"><em>enable</em></td><td>)</td>
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<p>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</dt><dd>Whatever POSIX fcntl() returns. On Windows nothing is changed on the handle. </dd></dl>
<dl class="section user"><dt>Memory Allocations</dt><dd>No memory allocation. </dd></dl>
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<td class="memname">virtual <a class="el" href="namespaceboost_1_1afio_1_1v2__xxx.html#ac8d06ecaa9660e7251c1251d88c1305c">result</a><void> boost::afio::v2_xxx::handle::set_kernel_caching </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a81c7de194feaa88684ca9851d0d527ca">caching</a> </td>
<td class="paramname"><em>caching</em></td><td>)</td>
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<p>Changes the kernel cache strategy used by this handle. Note most OSs impose severe restrictions on what can be changed and will error out, it may be easier to simply create a new handle.</p>
<dl class="section warning"><dt>Warning</dt><dd>On Windows this reopens the file, it is no slower than opening the file fresh but equally it is vastly slower than on POSIX.</dd></dl>
<dl class="section user"><dt>Errors returnable</dt><dd>Whatever POSIX fcntl() or ReOpenFile() returns. </dd></dl>
<dl class="section user"><dt>Memory Allocations</dt><dd>No memory allocation. </dd></dl>
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<td class="memname"><a class="el" href="namespaceboost_1_1afio_1_1v2__xxx.html#ac8d06ecaa9660e7251c1251d88c1305c">result</a><<a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a617ab627aa596b325d7bfef5210a43f3">extent_type</a>> boost::afio::v2_xxx::section_handle::truncate </td>
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<td class="paramtype"><a class="el" href="classboost_1_1afio_1_1v2__xxx_1_1handle.html#a617ab627aa596b325d7bfef5210a43f3">extent_type</a> </td>
<td class="paramname"><em>newsize</em></td><td>)</td>
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<p>Resize the current maximum permitted extent of the memory section to the given extent.</p>
<dl class="section user"><dt>Errors returnable</dt><dd>Any of the values NtExtendSection() can return. On POSIX this is a no op. </dd></dl>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li>include/boost/afio/v2.0/<a class="el" href="map__handle_8hpp.html">map_handle.hpp</a></li>
</ul>
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