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<div class="title">llfio_v2_xxx::algorithm::combining_handle_adapter< Op, Target, Source > Class Template Reference</div> </div>
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<p>A handle combining the data from one or two other handles.
<a href="classllfio__v2__xxx_1_1algorithm_1_1combining__handle__adapter.html#details">More...</a></p>
<p><code>#include "combining.hpp"</code></p>
<div class="dynheader">
Inheritance diagram for llfio_v2_xxx::algorithm::combining_handle_adapter< Op, Target, Source >:</div>
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<img src="classllfio__v2__xxx_1_1algorithm_1_1combining__handle__adapter.png" usemap="#llfio_5Fv2_5Fxxx::algorithm::combining_5Fhandle_5Fadapter_3C_20Op_2C_20Target_2C_20Source_20_3E_map" alt=""/>
<map id="llfio_5Fv2_5Fxxx::algorithm::combining_5Fhandle_5Fadapter_3C_20Op_2C_20Target_2C_20Source_20_3E_map" name="llfio_5Fv2_5Fxxx::algorithm::combining_5Fhandle_5Fadapter_3C_20Op_2C_20Target_2C_20Source_20_3E_map">
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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:a06f517c08339014bfbf70f6da07be847"><td class="memItemLeft" align="right" valign="top"><a id="a06f517c08339014bfbf70f6da07be847"></a>
using </td><td class="memItemRight" valign="bottom"><b>path_type</b> = io_handle::path_type</td></tr>
<tr class="separator:a06f517c08339014bfbf70f6da07be847"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:acb6eafba06e83383c985019dce2b1d61"><td class="memItemLeft" align="right" valign="top"><a id="acb6eafba06e83383c985019dce2b1d61"></a>
using </td><td class="memItemRight" valign="bottom"><b>extent_type</b> = io_handle::extent_type</td></tr>
<tr class="separator:acb6eafba06e83383c985019dce2b1d61"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a88b45d183e9756a86b32386b9a6f109e"><td class="memItemLeft" align="right" valign="top"><a id="a88b45d183e9756a86b32386b9a6f109e"></a>
using </td><td class="memItemRight" valign="bottom"><b>size_type</b> = io_handle::size_type</td></tr>
<tr class="separator:a88b45d183e9756a86b32386b9a6f109e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a47df31310a28561efbfe65b678a699d4"><td class="memItemLeft" align="right" valign="top"><a id="a47df31310a28561efbfe65b678a699d4"></a>
using </td><td class="memItemRight" valign="bottom"><b>mode</b> = <a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dca">io_handle::mode</a></td></tr>
<tr class="separator:a47df31310a28561efbfe65b678a699d4"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a5626652ef800d549dbf83607f09ed9a9"><td class="memItemLeft" align="right" valign="top"><a id="a5626652ef800d549dbf83607f09ed9a9"></a>
using </td><td class="memItemRight" valign="bottom"><b>creation</b> = <a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42">io_handle::creation</a></td></tr>
<tr class="separator:a5626652ef800d549dbf83607f09ed9a9"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a9bf783aed0ee8ee06b2005d1615beb3e"><td class="memItemLeft" align="right" valign="top"><a id="a9bf783aed0ee8ee06b2005d1615beb3e"></a>
using </td><td class="memItemRight" valign="bottom"><b>caching</b> = <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">io_handle::caching</a></td></tr>
<tr class="separator:a9bf783aed0ee8ee06b2005d1615beb3e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a5f04ab5c665244d2bd8f371f10fd330a"><td class="memItemLeft" align="right" valign="top"><a id="a5f04ab5c665244d2bd8f371f10fd330a"></a>
using </td><td class="memItemRight" valign="bottom"><b>flag</b> = io_handle::flag</td></tr>
<tr class="separator:a5f04ab5c665244d2bd8f371f10fd330a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a4227056a72bf24e7343ea1a98f4729cf"><td class="memItemLeft" align="right" valign="top"><a id="a4227056a72bf24e7343ea1a98f4729cf"></a>
using </td><td class="memItemRight" valign="bottom"><b>buffer_type</b> = <a class="el" href="structllfio__v2__xxx_1_1io__handle_1_1buffer__type.html">io_handle::buffer_type</a></td></tr>
<tr class="separator:a4227056a72bf24e7343ea1a98f4729cf"><td class="memSeparator" colspan="2"> </td></tr>
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using </td><td class="memItemRight" valign="bottom"><b>const_buffer_type</b> = <a class="el" href="structllfio__v2__xxx_1_1io__handle_1_1const__buffer__type.html">io_handle::const_buffer_type</a></td></tr>
<tr class="separator:a673cbeb0cd107cff01f86dbf64222d18"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a9cda6dec04c4a26cb7c0b7be967f5ba7"><td class="memItemLeft" align="right" valign="top"><a id="a9cda6dec04c4a26cb7c0b7be967f5ba7"></a>
using </td><td class="memItemRight" valign="bottom"><b>buffers_type</b> = <a class="el" href="classllfio__v2__xxx_1_1io__handle.html#a8f525d9665b524442b46cd55678817ed">io_handle::buffers_type</a></td></tr>
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using </td><td class="memItemRight" valign="bottom"><b>const_buffers_type</b> = <a class="el" href="classllfio__v2__xxx_1_1io__handle.html#a693a8c64bb7de1a6835d6a151e37aa0e">io_handle::const_buffers_type</a></td></tr>
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template<class T > </td></tr>
<tr class="memitem:a062212d815f834770edb424487bec4c4"><td class="memTemplItemLeft" align="right" valign="top">using </td><td class="memTemplItemRight" valign="bottom"><b>io_request</b> = <a class="el" href="structllfio__v2__xxx_1_1io__handle_1_1io__request.html">io_handle::io_request</a>< T ></td></tr>
<tr class="separator:a062212d815f834770edb424487bec4c4"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a6dbc56b017dfde90bc9df067838bc6b6"><td class="memTemplParams" colspan="2"><a id="a6dbc56b017dfde90bc9df067838bc6b6"></a>
template<class T > </td></tr>
<tr class="memitem:a6dbc56b017dfde90bc9df067838bc6b6"><td class="memTemplItemLeft" align="right" valign="top">using </td><td class="memTemplItemRight" valign="bottom"><b>io_result</b> = <a class="el" href="structllfio__v2__xxx_1_1io__handle_1_1io__result.html">io_handle::io_result</a>< T ></td></tr>
<tr class="separator:a6dbc56b017dfde90bc9df067838bc6b6"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ab0b7b07cb1282c369b1b663d21c1df3c"><td class="memItemLeft" align="right" valign="top"><a id="ab0b7b07cb1282c369b1b663d21c1df3c"></a>
using </td><td class="memItemRight" valign="bottom"><b>target_handle_type</b> = Target</td></tr>
<tr class="separator:ab0b7b07cb1282c369b1b663d21c1df3c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ad9c333e01114cddbed807c7bda522860"><td class="memItemLeft" align="right" valign="top"><a id="ad9c333e01114cddbed807c7bda522860"></a>
using </td><td class="memItemRight" valign="bottom"><b>source_handle_type</b> = Source</td></tr>
<tr class="separator:ad9c333e01114cddbed807c7bda522860"><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:aa69b0a7e5b852b6e1b065469c96634b1"><td class="memItemLeft" align="right" valign="top"><a id="aa69b0a7e5b852b6e1b065469c96634b1"></a>
 </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1algorithm_1_1combining__handle__adapter.html#aa69b0a7e5b852b6e1b065469c96634b1">combining_handle_adapter</a> ()=default</td></tr>
<tr class="memdesc:aa69b0a7e5b852b6e1b065469c96634b1"><td class="mdescLeft"> </td><td class="mdescRight">Default constructor. <br /></td></tr>
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<tr class="memitem:ad1709516df5d85349325940187f57712"><td class="memTemplParams" colspan="2"><a id="ad1709516df5d85349325940187f57712"></a>
template<class... Args> </td></tr>
<tr class="memitem:ad1709516df5d85349325940187f57712"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1algorithm_1_1combining__handle__adapter.html#ad1709516df5d85349325940187f57712">combining_handle_adapter</a> (target_handle_type *a, source_handle_type *b, <a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dca">mode</a> _mode=<a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dcaaefb2a684e4afb7d55e6147fbe5a332ee">mode::write</a>, flag flags=flag::none, Args &&... args)</td></tr>
<tr class="memdesc:ad1709516df5d85349325940187f57712"><td class="mdescLeft"> </td><td class="mdescRight">Constructor, passing any extra arguments to <code>Op::override</code>. <br /></td></tr>
<tr class="separator:ad1709516df5d85349325940187f57712"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ae54760bdd0fa784866e9f0e355c62077"><td class="memItemLeft" align="right" valign="top"><a id="ae54760bdd0fa784866e9f0e355c62077"></a>
 </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1algorithm_1_1combining__handle__adapter.html#ae54760bdd0fa784866e9f0e355c62077">combining_handle_adapter</a> (<a class="el" href="classllfio__v2__xxx_1_1algorithm_1_1combining__handle__adapter.html">combining_handle_adapter</a> &&o) noexcept</td></tr>
<tr class="memdesc:ae54760bdd0fa784866e9f0e355c62077"><td class="mdescLeft"> </td><td class="mdescRight">Implicit move construction of combining_handle_adapter permitted. <br /></td></tr>
<tr class="separator:ae54760bdd0fa784866e9f0e355c62077"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a29adaaf07569fbc92039fb3f2d17e479"><td class="memItemLeft" align="right" valign="top"><a id="a29adaaf07569fbc92039fb3f2d17e479"></a>
 </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1algorithm_1_1combining__handle__adapter.html#a29adaaf07569fbc92039fb3f2d17e479">combining_handle_adapter</a> (const <a class="el" href="classllfio__v2__xxx_1_1algorithm_1_1combining__handle__adapter.html">combining_handle_adapter</a> &)=delete</td></tr>
<tr class="memdesc:a29adaaf07569fbc92039fb3f2d17e479"><td class="mdescLeft"> </td><td class="mdescRight">No copy construction (use <code>clone()</code>) <br /></td></tr>
<tr class="separator:a29adaaf07569fbc92039fb3f2d17e479"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a9e767cbccf4130478b49012693168f5c"><td class="memItemLeft" align="right" valign="top"><a id="a9e767cbccf4130478b49012693168f5c"></a>
<a class="el" href="classllfio__v2__xxx_1_1algorithm_1_1combining__handle__adapter.html">combining_handle_adapter</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1algorithm_1_1combining__handle__adapter.html#a9e767cbccf4130478b49012693168f5c">operator=</a> (<a class="el" href="classllfio__v2__xxx_1_1algorithm_1_1combining__handle__adapter.html">combining_handle_adapter</a> &&o) noexcept</td></tr>
<tr class="memdesc:a9e767cbccf4130478b49012693168f5c"><td class="mdescLeft"> </td><td class="mdescRight">Move assignment of combining_handle_adapter permitted. <br /></td></tr>
<tr class="separator:a9e767cbccf4130478b49012693168f5c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a6fad139bec35264b356c2e057318db3e"><td class="memItemLeft" align="right" valign="top"><a id="a6fad139bec35264b356c2e057318db3e"></a>
<a class="el" href="classllfio__v2__xxx_1_1algorithm_1_1combining__handle__adapter.html">combining_handle_adapter</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1algorithm_1_1combining__handle__adapter.html#a6fad139bec35264b356c2e057318db3e">operator=</a> (const <a class="el" href="classllfio__v2__xxx_1_1algorithm_1_1combining__handle__adapter.html">combining_handle_adapter</a> &)=delete</td></tr>
<tr class="memdesc:a6fad139bec35264b356c2e057318db3e"><td class="mdescLeft"> </td><td class="mdescRight">No copy assignment. <br /></td></tr>
<tr class="separator:a6fad139bec35264b356c2e057318db3e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aefc25feff3ba060a3b3092a69cf4d5cc"><td class="memItemLeft" align="right" valign="top"><a id="aefc25feff3ba060a3b3092a69cf4d5cc"></a>
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1algorithm_1_1combining__handle__adapter.html#aefc25feff3ba060a3b3092a69cf4d5cc">swap</a> (<a class="el" href="classllfio__v2__xxx_1_1algorithm_1_1combining__handle__adapter.html">combining_handle_adapter</a> &o) noexcept</td></tr>
<tr class="memdesc:aefc25feff3ba060a3b3092a69cf4d5cc"><td class="mdescLeft"> </td><td class="mdescRight">Swap with another instance. <br /></td></tr>
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</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><h3>template<template< class, class > class Op, class Target, class Source><br />
class llfio_v2_xxx::algorithm::combining_handle_adapter< Op, Target, Source ></h3>
<p>A handle combining the data from one or two other handles. </p>
<dl class="tparams"><dt>Template Parameters</dt><dd>
<table class="tparams">
<tr><td class="paramname">Op</td><td>Policy class determining what kind of combination ought to be performed. </td></tr>
<tr><td class="paramname">Target</td><td>The type of the target handle. </td></tr>
<tr><td class="paramname">Source</td><td>The type of an optional additional source handle, or <code>void</code> to disable.</td></tr>
</table>
</dd>
</dl>
<dl class="section warning"><dt>Warning</dt><dd>This class is still in development, do not use.</dd></dl>
<p>This adapter class is a handle implementation which combines one or two other handle implementations in some way determined by <code>Op</code> which must match the form of:</p>
<div class="fragment"><div class="line"><span class="keyword">template</span><<span class="keyword">class</span> Target, <span class="keyword">class</span> Source> <span class="keyword">struct </span>Op</div><div class="line">{</div><div class="line"> <span class="keyword">using</span> buffer_type = <span class="keyword">typename</span> Target::buffer_type;</div><div class="line"> <span class="keyword">using</span> const_buffer_type = <span class="keyword">typename</span> Target::const_buffer_type;</div><div class="line"></div><div class="line"> <span class="comment">// Called by default implementation of read() to perform combines of reads</span></div><div class="line"> <span class="keyword">static</span> result<buffer_type> do_read(buffer_type out, buffer_type t, buffer_type s) noexcept;</div><div class="line"> <span class="comment">// Called by default implementation of write() to perform combines of writes</span></div><div class="line"> <span class="keyword">static</span> result<const_buffer_type> do_write(buffer_type t, buffer_type s, const_buffer_type in) noexcept;</div><div class="line"> <span class="comment">// Called by default implementation of write() to adjust returned buffers</span></div><div class="line"> <span class="keyword">static</span> result<const_buffers_type> adjust_written_buffers(const_buffers_type out, const_buffer_type twritten, const_buffer_type toriginal) noexcept;</div><div class="line"></div><div class="line"> <span class="comment">// Inherited into the resulting combining_handle_adapter</span></div><div class="line"> <span class="comment">// Used to inject/override custom member functions and/or eliminate the need for</span></div><div class="line"> <span class="comment">// do_read and do_write</span></div><div class="line"> <span class="keyword">template</span><<span class="keyword">class</span> Base> <span class="keyword">struct </span>override : <span class="keyword">public</span> Base { <span class="keyword">using</span> Base::Base; };</div><div class="line">};</div></div><!-- fragment --><p>If both input handle types have a base of <code>file_handle</code>, <code>combining_handle_adapter</code> inherits from <code>file_handle</code> and provides the extra member functions which <code>file_handle</code> provides over <code>io_handle</code>. If not, it inherits from <code>io_handle</code>, and provides that class' reduced functionality instead.</p>
<p>The default implementation of <code>read()</code> and <code>write()</code> allocate temporary buffers, and run <code>Op::do_read()</code> and <code>Op::do_write()</code> on each individual buffer issued by the end user of the combined handles. If each total request is below a page size, the stack is used, else <code>map_handle::map()</code> is used to get whole pages.</p>
<dl class="section note"><dt>Note</dt><dd>If OpenMP is available, <code>LLFIO_DISABLE_OPENMP</code> is not defined, and <code>flag::disable_parallelism</code> is not set, the buffer fill from the two attached handles will be done concurrently.</dd></dl>
<p>Combined reads may read less than inputs, but note that offset and buffers fetched from inputs are those of the request. Combined writes may write less than inputs, but again offset used is that of the request. In other words, this adapter is intended for bulk, mostly 1-to-1, combination and transformation of scatter gather buffers. It is not intended for processing scatter gather buffers.</p>
<p>If just one handle type is supplied (the additional source type is <code>void</code>), then instead of combining, this handle adapter is transforming. <code>Op::do_read()</code> and <code>Op::do_write()</code> will be called with the second of the input buffers empty.</p>
<p>The defaults for the virtual functions may not suit your use case, in which case you can override them in the <code>Op::override</code> class.</p>
<p>Destroying the adapter does not destroy the attached handles. Closing the adapter does close the attached handles.</p>
<dl class="todo"><dt><b><a class="el" href="todo.html#_todo000004">Todo:</a></b></dt><dd>I have been lazy and used public inheritance from <code>io_handle</code> and <code>file_handle</code>. I should use protected inheritance to prevent slicing, and expose all the public functions by hand. </dd></dl>
</div><hr/>The documentation for this class was generated from the following file:<ul>
<li>include/llfio/v2.0/algorithm/handle_adapter/<a class="el" href="combining_8hpp.html">combining.hpp</a></li>
</ul>
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