1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>wait_all, collecting all exceptions</title> 5<link rel="stylesheet" href="../../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../../index.html" title="Chapter 1. Fiber"> 8<link rel="up" href="../when_all_functionality.html" title="when_all functionality"> 9<link rel="prev" href="when_all_until_first_exception.html" title="when_all until first exception"> 10<link rel="next" href="when_all__heterogeneous_types.html" title="when_all, heterogeneous types"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="when_all_until_first_exception.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../when_all_functionality.html"><img src="../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="when_all__heterogeneous_types.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h4 class="title"> 27<a name="fiber.when_any.when_all_functionality.wait_all__collecting_all_exceptions"></a><a class="link" href="wait_all__collecting_all_exceptions.html" title="wait_all, collecting all exceptions">wait_all, 28 collecting all exceptions</a> 29</h4></div></div></div> 30<p> 31 <a name="wait_all_collect_errors"></a>Given <a class="link" href="when_all_until_first_exception.html#wait_all_until_error_source"><code class="computeroutput"><span class="identifier">wait_all_until_error_source</span><span class="special">()</span></code></a>, 32 it might be more reasonable to make a <code class="computeroutput"><span class="identifier">wait_all_</span><span class="special">...()</span></code> that collects <span class="emphasis"><em>all</em></span> 33 errors instead of presenting only the first: 34 </p> 35<p> 36</p> 37<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">Fn</span><span class="special">,</span> <span class="keyword">typename</span> <span class="special">...</span> <span class="identifier">Fns</span> <span class="special">></span> 38<span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">result_of</span><span class="special"><</span> <span class="identifier">Fn</span><span class="special">()</span> <span class="special">>::</span><span class="identifier">type</span> <span class="special">></span> 39<span class="identifier">wait_all_collect_errors</span><span class="special">(</span> <span class="identifier">Fn</span> <span class="special">&&</span> <span class="identifier">function</span><span class="special">,</span> <span class="identifier">Fns</span> <span class="special">&&</span> <span class="special">...</span> <span class="identifier">functions</span><span class="special">)</span> <span class="special">{</span> 40 <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">count</span><span class="special">(</span> <span class="number">1</span> <span class="special">+</span> <span class="keyword">sizeof</span> <span class="special">...</span> <span class="special">(</span> <span class="identifier">functions</span><span class="special">)</span> <span class="special">);</span> 41 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">result_of</span><span class="special"><</span> <span class="identifier">Fn</span><span class="special">()</span> <span class="special">>::</span><span class="identifier">type</span> <span class="identifier">return_t</span><span class="special">;</span> 42 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">fibers</span><span class="special">::</span><span class="identifier">future</span><span class="special"><</span> <span class="identifier">return_t</span> <span class="special">></span> <span class="identifier">future_t</span><span class="special">;</span> 43 <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span> <span class="identifier">return_t</span> <span class="special">></span> <span class="identifier">vector_t</span><span class="special">;</span> 44 <span class="identifier">vector_t</span> <span class="identifier">results</span><span class="special">;</span> 45 <span class="identifier">results</span><span class="special">.</span><span class="identifier">reserve</span><span class="special">(</span> <span class="identifier">count</span><span class="special">);</span> 46 <span class="identifier">exception_list</span> <span class="identifier">exceptions</span><span class="special">(</span><span class="string">"wait_all_collect_errors() exceptions"</span><span class="special">);</span> 47 48 <span class="comment">// get channel</span> 49 <span class="identifier">std</span><span class="special">::</span><span class="identifier">shared_ptr</span><span class="special"><</span> 50 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">fibers</span><span class="special">::</span><span class="identifier">buffered_channel</span><span class="special"><</span> <span class="identifier">future_t</span> <span class="special">></span> <span class="special">></span> <span class="identifier">chan</span><span class="special">(</span> 51 <span class="identifier">wait_all_until_error_source</span><span class="special">(</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">forward</span><span class="special"><</span> <span class="identifier">Fn</span> <span class="special">>(</span> <span class="identifier">function</span><span class="special">),</span> 52 <span class="identifier">std</span><span class="special">::</span><span class="identifier">forward</span><span class="special"><</span> <span class="identifier">Fns</span> <span class="special">>(</span> <span class="identifier">functions</span><span class="special">)</span> <span class="special">...</span> <span class="special">)</span> <span class="special">);</span> 53 <span class="comment">// fill results and/or exceptions vectors</span> 54 <span class="identifier">future_t</span> <span class="identifier">future</span><span class="special">;</span> 55 <span class="keyword">while</span> <span class="special">(</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">fibers</span><span class="special">::</span><span class="identifier">channel_op_status</span><span class="special">::</span><span class="identifier">success</span> <span class="special">==</span> <span class="identifier">chan</span><span class="special">-></span><span class="identifier">pop</span><span class="special">(</span> <span class="identifier">future</span><span class="special">)</span> <span class="special">)</span> <span class="special">{</span> 56 <span class="identifier">std</span><span class="special">::</span><span class="identifier">exception_ptr</span> <span class="identifier">exp</span> <span class="special">=</span> <span class="identifier">future</span><span class="special">.</span><span class="identifier">get_exception_ptr</span><span class="special">();</span> 57 <span class="keyword">if</span> <span class="special">(</span> <span class="special">!</span> <span class="identifier">exp</span><span class="special">)</span> <span class="special">{</span> 58 <span class="identifier">results</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span> <span class="identifier">future</span><span class="special">.</span><span class="identifier">get</span><span class="special">()</span> <span class="special">);</span> 59 <span class="special">}</span> <span class="keyword">else</span> <span class="special">{</span> 60 <span class="identifier">exceptions</span><span class="special">.</span><span class="identifier">add</span><span class="special">(</span> <span class="identifier">exp</span><span class="special">);</span> 61 <span class="special">}</span> 62 <span class="special">}</span> 63 <span class="comment">// if there were any exceptions, throw</span> 64 <span class="keyword">if</span> <span class="special">(</span> <span class="identifier">exceptions</span><span class="special">.</span><span class="identifier">size</span><span class="special">()</span> <span class="special">)</span> <span class="special">{</span> 65 <span class="keyword">throw</span> <span class="identifier">exceptions</span><span class="special">;</span> 66 <span class="special">}</span> 67 <span class="comment">// no exceptions: return vector to caller</span> 68 <span class="keyword">return</span> <span class="identifier">results</span><span class="special">;</span> 69<span class="special">}</span> 70</pre> 71<p> 72 </p> 73<p> 74 The implementation is a simple variation on <a class="link" href="../when_any/when_any__produce_first_success.html#wait_first_success"><code class="computeroutput"><span class="identifier">wait_first_success</span><span class="special">()</span></code></a>, 75 using the same <a class="link" href="../when_any/when_any__produce_first_success.html#exception_list"><code class="computeroutput"><span class="identifier">exception_list</span></code></a> 76 exception class. 77 </p> 78</div> 79<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 80<td align="left"></td> 81<td align="right"><div class="copyright-footer">Copyright © 2013 Oliver Kowalke<p> 82 Distributed under the Boost Software License, Version 1.0. (See accompanying 83 file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) 84 </p> 85</div></td> 86</tr></table> 87<hr> 88<div class="spirit-nav"> 89<a accesskey="p" href="when_all_until_first_exception.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../when_all_functionality.html"><img src="../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="when_all__heterogeneous_types.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 90</div> 91</body> 92</html> 93
