1196 lines
63 KiB
HTML
1196 lines
63 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta name="generator" content="Asciidoctor 2.0.23">
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<meta name="author" content="Peter Dimov">
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<title>Boost.Assert</title>
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:300,300italic,400,400italic,600,600italic%7CNoto+Serif:400,400italic,700,700italic%7CDroid+Sans+Mono:400,700">
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<style>
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/*! Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
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/* Uncomment the following line when using as a custom stylesheet */
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<body class="article toc2 toc-left">
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<div id="header">
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<h1>Boost.Assert</h1>
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<div class="details">
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<span id="author" class="author">Peter Dimov</span><br>
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</div>
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<div id="toc" class="toc2">
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<div id="toctitle">Table of Contents</div>
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<ul class="sectlevel1">
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<li><a href="#assertion_macros">Assertion Macros, <boost/assert.hpp></a>
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<ul class="sectlevel2">
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<li><a href="#boost_assert">BOOST_ASSERT</a></li>
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<li><a href="#boost_assert_msg">BOOST_ASSERT_MSG</a></li>
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<li><a href="#boost_verify">BOOST_VERIFY</a></li>
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<li><a href="#boost_verify_msg">BOOST_VERIFY_MSG</a></li>
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<li><a href="#boost_assert_is_void">BOOST_ASSERT_IS_VOID</a></li>
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</ul>
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</li>
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<li><a href="#current_function_macro">Current Function Macro, <boost/current_function.hpp></a>
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<ul class="sectlevel2">
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<li><a href="#boost_current_function">BOOST_CURRENT_FUNCTION</a></li>
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</ul>
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</li>
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<li><a href="#source_location_support">Source Location Support, <boost/assert/source_location.hpp></a>
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<ul class="sectlevel2">
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<li><a href="#description">Description</a></li>
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<li><a href="#synopsis">Synopsis</a></li>
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<li><a href="#source_location">source_location</a></li>
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<li><a href="#to_string">to_string</a></li>
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<li><a href="#operator">operator<<</a></li>
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<li><a href="#boost_current_location">BOOST_CURRENT_LOCATION</a></li>
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</ul>
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</li>
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<li><a href="#changes">Revision History</a>
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<ul class="sectlevel2">
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<li><a href="#changes_in_1_88_0">Changes in 1.88.0</a></li>
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<li><a href="#changes_in_1_79_0">Changes in 1.79.0</a></li>
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<li><a href="#changes_in_1_78_0">Changes in 1.78.0</a></li>
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<li><a href="#changes_in_1_73_0">Changes in 1.73.0</a></li>
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</ul>
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</li>
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<li><a href="#copyright_and_license">Appendix A: Copyright and License</a></li>
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</ul>
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</div>
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</div>
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<div id="content">
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<div id="preamble">
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<div class="sectionbody">
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<div class="paragraph">
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<p>The Boost.Assert library provides several configurable diagnostic macros
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similar in behavior and purpose to the standard macro <code>assert</code> from <code><cassert></code>.</p>
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</div>
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</div>
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</div>
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<div class="sect1">
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<h2 id="assertion_macros">Assertion Macros, <boost/assert.hpp></h2>
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<div class="sectionbody">
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<div class="sect2">
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<h3 id="boost_assert">BOOST_ASSERT</h3>
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<div class="paragraph">
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<p>The header <code><boost/assert.hpp></code> defines the macro <code>BOOST_ASSERT</code>,
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which is similar to the standard <code>assert</code> macro defined in <code><cassert></code>.
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The macro is intended to be used in both Boost libraries and user
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code.</p>
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</div>
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<div class="ulist">
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<ul>
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<li>
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<p>By default, <code>BOOST_ASSERT(expr)</code> expands to <code>assert(expr)</code>.</p>
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</li>
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<li>
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<p>If the macro <code>BOOST_DISABLE_ASSERTS</code> is defined when <code><boost/assert.hpp></code>
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is included, <code>BOOST_ASSERT(expr)</code> expands to <code>((void)0)</code>, regardless of whether
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the macro <code>NDEBUG</code> is defined. This allows users to selectively disable <code>BOOST_ASSERT</code> without
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|
affecting the definition of the standard <code>assert</code>.</p>
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</li>
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|
<li>
|
|
<p>If the macro <code>BOOST_ENABLE_ASSERT_HANDLER</code> is defined when <code><boost/assert.hpp></code>
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|
is included, <code>BOOST_ASSERT(expr)</code> expands to</p>
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<div class="listingblock">
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<div class="content">
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<pre class="rouge highlight"><code data-lang="none">(BOOST_LIKELY(!!(expr))? ((void)0): ::boost::assertion_failed(#expr,
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BOOST_CURRENT_FUNCTION, __FILE__, __LINE__))</code></pre>
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</div>
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</div>
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<div class="paragraph">
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<p>That is, it evaluates <code>expr</code> and if it’s false, calls
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|
<code>::boost::assertion_failed(#expr, <a href="#boost_current_function">BOOST_CURRENT_FUNCTION</a>, __FILE__, __LINE__)</code>.
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This is true regardless of whether <code>NDEBUG</code> is defined.</p>
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|
</div>
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|
<div class="paragraph">
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|
<p><code>boost::assertion_failed</code> is declared in <code><boost/assert.hpp></code> as</p>
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|
</div>
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<div class="listingblock">
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|
<div class="content">
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<pre class="rouge highlight"><code data-lang="c++"><span class="k">namespace</span> <span class="n">boost</span>
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<span class="p">{</span>
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<span class="cp">#if defined(BOOST_ASSERT_HANDLER_IS_NORETURN)
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|
</span> <span class="n">BOOST_NORETURN</span>
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|
<span class="cp">#endif
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|
</span> <span class="kt">void</span> <span class="n">assertion_failed</span><span class="p">(</span><span class="kt">char</span> <span class="k">const</span> <span class="o">*</span> <span class="n">expr</span><span class="p">,</span> <span class="kt">char</span> <span class="k">const</span> <span class="o">*</span> <span class="n">function</span><span class="p">,</span>
|
|
<span class="kt">char</span> <span class="k">const</span> <span class="o">*</span> <span class="n">file</span><span class="p">,</span> <span class="kt">long</span> <span class="n">line</span><span class="p">);</span>
|
|
<span class="p">}</span></code></pre>
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|
</div>
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|
</div>
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|
<div class="paragraph">
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|
<p>but it is never defined. The user is expected to supply an appropriate definition.</p>
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|
</div>
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|
</li>
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|
<li>
|
|
<p>If the macro <code>BOOST_ENABLE_ASSERT_DEBUG_HANDLER</code> is defined when <code><boost/assert.hpp></code>
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|
is included, <code>BOOST_ASSERT(expr)</code> expands to <code>((void)0)</code> when <code>NDEBUG</code> is
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|
defined. Otherwise the behavior is as if <code>BOOST_ENABLE_ASSERT_HANDLER</code> has been defined.</p>
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|
</li>
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|
</ul>
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|
</div>
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|
<div class="paragraph">
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|
<p>As is the case with <code><cassert></code>, <code><boost/assert.hpp></code>
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|
can be included multiple times in a single translation unit. <code>BOOST_ASSERT</code>
|
|
will be redefined each time as specified above.</p>
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|
</div>
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|
</div>
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|
<div class="sect2">
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|
<h3 id="boost_assert_msg">BOOST_ASSERT_MSG</h3>
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|
<div class="paragraph">
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|
<p>The macro <code>BOOST_ASSERT_MSG</code> is similar to <code>BOOST_ASSERT</code>, but it takes an additional argument,
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|
a character literal, supplying an error message.</p>
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|
</div>
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|
<div class="ulist">
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|
<ul>
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|
<li>
|
|
<p>By default, <code>BOOST_ASSERT_MSG(expr,msg)</code> expands to <code>assert((expr)&&(msg))</code>.</p>
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|
</li>
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|
<li>
|
|
<p>If the macro <code>BOOST_DISABLE_ASSERTS</code> is defined when <code><boost/assert.hpp></code>
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|
is included, <code>BOOST_ASSERT_MSG(expr,msg)</code> expands to <code>((void)0)</code>, regardless of whether
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|
the macro <code>NDEBUG</code> is defined.</p>
|
|
</li>
|
|
<li>
|
|
<p>If the macro <code>BOOST_ENABLE_ASSERT_HANDLER</code> is defined when <code><boost/assert.hpp></code>
|
|
is included, <code>BOOST_ASSERT_MSG(expr,msg)</code> expands to</p>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre class="rouge highlight"><code data-lang="none">(BOOST_LIKELY(!!(expr))? ((void)0): ::boost::assertion_failed_msg(#expr,
|
|
msg, BOOST_CURRENT_FUNCTION, __FILE__, __LINE__))</code></pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>This is true regardless of whether <code>NDEBUG</code> is defined.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p><code>boost::assertion_failed_msg</code> is declared in <code><boost/assert.hpp></code> as</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre class="rouge highlight"><code data-lang="c++"><span class="k">namespace</span> <span class="n">boost</span>
|
|
<span class="p">{</span>
|
|
<span class="cp">#if defined(BOOST_ASSERT_HANDLER_IS_NORETURN)
|
|
</span> <span class="n">BOOST_NORETURN</span>
|
|
<span class="cp">#endif
|
|
</span> <span class="kt">void</span> <span class="n">assertion_failed_msg</span><span class="p">(</span><span class="kt">char</span> <span class="k">const</span> <span class="o">*</span> <span class="n">expr</span><span class="p">,</span> <span class="kt">char</span> <span class="k">const</span> <span class="o">*</span> <span class="n">msg</span><span class="p">,</span>
|
|
<span class="kt">char</span> <span class="k">const</span> <span class="o">*</span> <span class="n">function</span><span class="p">,</span> <span class="kt">char</span> <span class="k">const</span> <span class="o">*</span> <span class="n">file</span><span class="p">,</span> <span class="kt">long</span> <span class="n">line</span><span class="p">);</span>
|
|
<span class="p">}</span></code></pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>but it is never defined. The user is expected to supply an appropriate definition.</p>
|
|
</div>
|
|
</li>
|
|
<li>
|
|
<p>If the macro <code>BOOST_ENABLE_ASSERT_DEBUG_HANDLER</code> is defined when <code><boost/assert.hpp></code>
|
|
is included, <code>BOOST_ASSERT_MSG(expr)</code> expands to <code>((void)0)</code> when <code>NDEBUG</code> is
|
|
defined. Otherwise the behavior is as if <code>BOOST_ENABLE_ASSERT_HANDLER</code> has been defined.</p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>As is the case with <code><cassert></code>, <code><boost/assert.hpp></code>
|
|
can be included multiple times in a single translation unit. <code>BOOST_ASSERT_MSG</code>
|
|
will be redefined each time as specified above.</p>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="boost_verify">BOOST_VERIFY</h3>
|
|
<div class="paragraph">
|
|
<p>The macro <code>BOOST_VERIFY</code> has the same behavior as <code>BOOST_ASSERT</code>, except that
|
|
the expression that is passed to <code>BOOST_VERIFY</code> is always
|
|
evaluated. This is useful when the asserted expression has desirable side
|
|
effects; it can also help suppress warnings about unused variables when the
|
|
only use of the variable is inside an assertion.</p>
|
|
</div>
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p>If the macro <code>BOOST_DISABLE_ASSERTS</code> is defined when <code><boost/assert.hpp></code>
|
|
is included, <code>BOOST_VERIFY(expr)</code> expands to <code>((void)(expr))</code>.</p>
|
|
</li>
|
|
<li>
|
|
<p>If the macro <code>BOOST_ENABLE_ASSERT_HANDLER</code> is defined when <code><boost/assert.hpp></code>
|
|
is included, <code>BOOST_VERIFY(expr)</code> expands to <code>BOOST_ASSERT(expr)</code>.</p>
|
|
</li>
|
|
<li>
|
|
<p>Otherwise, <code>BOOST_VERIFY(expr)</code> expands to <code>((void)(expr))</code> when <code>NDEBUG</code> is
|
|
defined, to <code>BOOST_ASSERT(expr)</code> when it’s not.</p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="boost_verify_msg">BOOST_VERIFY_MSG</h3>
|
|
<div class="paragraph">
|
|
<p>The macro <code>BOOST_VERIFY_MSG</code> is similar to <code>BOOST_VERIFY</code>, with an additional parameter, an error message.</p>
|
|
</div>
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p>If the macro <code>BOOST_DISABLE_ASSERTS</code> is defined when <code><boost/assert.hpp></code>
|
|
is included, <code>BOOST_VERIFY_MSG(expr,msg)</code> expands to <code>((void)(expr))</code>.</p>
|
|
</li>
|
|
<li>
|
|
<p>If the macro <code>BOOST_ENABLE_ASSERT_HANDLER</code> is defined when <code><boost/assert.hpp></code>
|
|
is included, <code>BOOST_VERIFY_MSG(expr,msg)</code> expands to <code>BOOST_ASSERT_MSG(expr,msg)</code>.</p>
|
|
</li>
|
|
<li>
|
|
<p>Otherwise, <code>BOOST_VERIFY_MSG(expr,msg)</code> expands to <code>((void)(expr))</code> when <code>NDEBUG</code> is
|
|
defined, to <code>BOOST_ASSERT_MSG(expr,msg)</code> when it’s not.</p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="boost_assert_is_void">BOOST_ASSERT_IS_VOID</h3>
|
|
<div class="paragraph">
|
|
<p>The macro <code>BOOST_ASSERT_IS_VOID</code> is defined when <code>BOOST_ASSERT</code> and <code>BOOST_ASSERT_MSG</code> are expanded to <code>((void)0)</code>.
|
|
Its purpose is to avoid compiling and potentially running code that is only intended to prepare data to be used in the assertion.</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre class="rouge highlight"><code data-lang="c++"><span class="kt">void</span> <span class="n">MyContainer</span><span class="o">::</span><span class="n">erase</span><span class="p">(</span><span class="n">iterator</span> <span class="n">i</span><span class="p">)</span>
|
|
<span class="p">{</span>
|
|
<span class="c1">// Some sanity checks, data must be ordered</span>
|
|
<span class="cp">#ifndef BOOST_ASSERT_IS_VOID
|
|
</span>
|
|
<span class="k">if</span><span class="p">(</span><span class="n">i</span> <span class="o">!=</span> <span class="n">c</span><span class="p">.</span><span class="n">begin</span><span class="p">())</span> <span class="p">{</span>
|
|
<span class="n">iterator</span> <span class="n">prev</span> <span class="o">=</span> <span class="n">i</span><span class="p">;</span>
|
|
<span class="o">--</span><span class="n">prev</span><span class="p">;</span>
|
|
<span class="n">BOOST_ASSERT</span><span class="p">(</span><span class="o">*</span><span class="n">prev</span> <span class="o"><</span> <span class="o">*</span><span class="n">i</span><span class="p">);</span>
|
|
<span class="p">}</span>
|
|
<span class="k">else</span> <span class="nf">if</span><span class="p">(</span><span class="n">i</span> <span class="o">!=</span> <span class="n">c</span><span class="p">.</span><span class="n">end</span><span class="p">())</span> <span class="p">{</span>
|
|
<span class="n">iterator</span> <span class="n">next</span> <span class="o">=</span> <span class="n">i</span><span class="p">;</span>
|
|
<span class="o">++</span><span class="n">next</span><span class="p">;</span>
|
|
<span class="n">BOOST_ASSERT</span><span class="p">(</span><span class="o">*</span><span class="n">i</span> <span class="o"><</span> <span class="o">*</span><span class="n">next</span><span class="p">);</span>
|
|
<span class="p">}</span>
|
|
|
|
<span class="cp">#endif
|
|
</span>
|
|
<span class="k">this</span><span class="o">-></span><span class="n">erase_impl</span><span class="p">(</span><span class="n">i</span><span class="p">);</span>
|
|
<span class="p">}</span></code></pre>
|
|
</div>
|
|
</div>
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p>By default, <code>BOOST_ASSERT_IS_VOID</code> is defined if <code>NDEBUG</code> is defined.</p>
|
|
</li>
|
|
<li>
|
|
<p>If the macro <code>BOOST_DISABLE_ASSERTS</code> is defined, <code>BOOST_ASSERT_IS_VOID</code> is always defined.</p>
|
|
</li>
|
|
<li>
|
|
<p>If the macro <code>BOOST_ENABLE_ASSERT_HANDLER</code> is defined, <code>BOOST_ASSERT_IS_VOID</code> is never defined.</p>
|
|
</li>
|
|
<li>
|
|
<p>If the macro <code>BOOST_ENABLE_ASSERT_DEBUG_HANDLER</code> is defined, then <code>BOOST_ASSERT_IS_VOID</code> is defined when <code>NDEBUG</code> is defined.</p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="current_function_macro">Current Function Macro, <boost/current_function.hpp></h2>
|
|
<div class="sectionbody">
|
|
<div class="sect2">
|
|
<h3 id="boost_current_function">BOOST_CURRENT_FUNCTION</h3>
|
|
<div class="paragraph">
|
|
<p>The header <code><boost/current_function.hpp></code> defines a single macro, <code>BOOST_CURRENT_FUNCTION</code>,
|
|
similar to the C99 predefined identifier <code>__func__</code>.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p><code>BOOST_CURRENT_FUNCTION</code> expands to either a string literal, or the name of a
|
|
character array local to the current function, containing the (fully qualified,
|
|
if possible) name of the enclosing function. If there is no enclosing function,
|
|
the behavior varies by compiler, but is usually a compile error.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Some compilers do not provide a way to obtain the name of the current enclosing
|
|
function. On such compilers, or when the macro <code>BOOST_DISABLE_CURRENT_FUNCTION</code>
|
|
is defined, <code>BOOST_CURRENT_FUNCTION</code> expands to <code>"(unknown)"</code>.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p><code>BOOST_DISABLE_CURRENT_FUNCTION</code> addresses a use case in which the programmer
|
|
wishes to eliminate the string literals produced by <code>BOOST_CURRENT_FUNCTION</code> from
|
|
the final executable for security reasons.</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="source_location_support">Source Location Support, <boost/assert/source_location.hpp></h2>
|
|
<div class="sectionbody">
|
|
<div class="sect2">
|
|
<h3 id="description">Description</h3>
|
|
<div class="paragraph">
|
|
<p>The header <code><boost/assert/source_location.hpp></code> defines <code>source_location</code>,
|
|
a class representing a source location and containing file, line, function
|
|
and column information. It’s similar to <code>std::source_location</code> from C++20,
|
|
but only requires C++03.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>The macro <code>BOOST_CURRENT_LOCATION</code> creates a <code>source_location</code> object
|
|
containing information about the current source location. It can be used
|
|
roughly in the same way <code>std::source_location::current()</code> can be used,
|
|
such as in the declaration of a function default argument:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre class="rouge highlight"><code data-lang="c++"><span class="cp">#include</span> <span class="cpf"><boost/assert/source_location.hpp></span><span class="cp">
|
|
#include</span> <span class="cpf"><iostream></span><span class="cp">
|
|
</span>
|
|
<span class="kt">void</span> <span class="nf">f</span><span class="p">(</span> <span class="n">boost</span><span class="o">::</span><span class="n">source_location</span> <span class="k">const</span><span class="o">&</span> <span class="n">loc</span> <span class="o">=</span> <span class="n">BOOST_CURRENT_LOCATION</span> <span class="p">)</span>
|
|
<span class="p">{</span>
|
|
<span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o"><<</span> <span class="s">"f() called from: "</span> <span class="o"><<</span> <span class="n">loc</span> <span class="o"><<</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
|
|
<span class="p">}</span>
|
|
|
|
<span class="kt">int</span> <span class="nf">main</span><span class="p">()</span>
|
|
<span class="p">{</span>
|
|
<span class="n">f</span><span class="p">();</span>
|
|
<span class="p">}</span></code></pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>The output of this example varies by compiler and C++ standard level, but
|
|
it’s generally one of</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre class="rouge highlight"><code data-lang="none">f() called from: example.cpp:11:6 in function 'int main()'</code></pre>
|
|
</div>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre class="rouge highlight"><code data-lang="none">f() called from: example.cpp:11:5 in function 'main'</code></pre>
|
|
</div>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre class="rouge highlight"><code data-lang="none">f() called from: example.cpp:11 in function 'main'</code></pre>
|
|
</div>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre class="rouge highlight"><code data-lang="none">f() called from: example.cpp:4</code></pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>This is useful if, for example, you want to declare a function that throws
|
|
an exception, such that the source location of the caller is attached to
|
|
the thrown exception:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre class="rouge highlight"><code data-lang="c++"><span class="n">BOOST_NORETURN</span> <span class="n">BOOST_NOINLINE</span> <span class="kt">void</span> <span class="nf">throw_invalid_argument</span><span class="p">(</span>
|
|
<span class="kt">char</span> <span class="k">const</span><span class="o">*</span> <span class="n">message</span><span class="p">,</span>
|
|
<span class="n">boost</span><span class="o">::</span><span class="n">source_location</span> <span class="k">const</span><span class="o">&</span> <span class="n">loc</span> <span class="o">=</span> <span class="n">BOOST_CURRENT_LOCATION</span> <span class="p">)</span>
|
|
<span class="p">{</span>
|
|
<span class="n">boost</span><span class="o">::</span><span class="n">throw_exception</span><span class="p">(</span> <span class="n">std</span><span class="o">::</span><span class="n">invalid_argument</span><span class="p">(</span> <span class="n">message</span> <span class="p">),</span> <span class="n">loc</span> <span class="p">);</span>
|
|
<span class="p">}</span></code></pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Now you could use this helper function in, say, the implementation of
|
|
<code>at</code> to signal an index that is out of range:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre class="rouge highlight"><code data-lang="c++"><span class="n">T</span><span class="o">&</span> <span class="n">my_class</span><span class="o">::</span><span class="n">at</span><span class="p">(</span> <span class="kt">size_t</span> <span class="n">i</span> <span class="p">)</span>
|
|
<span class="p">{</span>
|
|
<span class="k">if</span><span class="p">(</span> <span class="n">i</span> <span class="o">>=</span> <span class="n">size</span><span class="p">()</span> <span class="p">)</span> <span class="n">throw_invalid_argument</span><span class="p">(</span> <span class="s">"index out of range"</span> <span class="p">);</span>
|
|
<span class="k">return</span> <span class="n">data</span><span class="p">()[</span> <span class="n">i</span> <span class="p">];</span>
|
|
<span class="p">}</span></code></pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>This would attach the source location of the line in <code>at</code> that calls
|
|
<code>throw_invalid_argument</code> to the thrown exception.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Note that if instead you use <code>BOOST_THROW_EXCEPTION</code> in
|
|
<code>throw_invalid_argument</code>, the location will be that of
|
|
<code>throw_invalid_argument</code> and not of its caller.</p>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="synopsis">Synopsis</h3>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre class="rouge highlight"><code data-lang="c++"><span class="k">namespace</span> <span class="n">boost</span>
|
|
<span class="p">{</span>
|
|
|
|
<span class="k">struct</span> <span class="nc">source_location</span>
|
|
<span class="p">{</span>
|
|
<span class="k">constexpr</span> <span class="n">source_location</span><span class="p">()</span> <span class="k">noexcept</span><span class="p">;</span>
|
|
<span class="k">constexpr</span> <span class="n">source_location</span><span class="p">(</span> <span class="kt">char</span> <span class="k">const</span><span class="o">*</span> <span class="n">file</span><span class="p">,</span> <span class="kt">uint_least32_t</span> <span class="n">line</span><span class="p">,</span>
|
|
<span class="kt">char</span> <span class="k">const</span><span class="o">*</span> <span class="n">function</span><span class="p">,</span> <span class="kt">uint_least32_t</span> <span class="n">column</span> <span class="o">=</span> <span class="mi">0</span> <span class="p">)</span> <span class="k">noexcept</span><span class="p">;</span>
|
|
<span class="k">constexpr</span> <span class="n">source_location</span><span class="p">(</span> <span class="n">std</span><span class="o">::</span><span class="n">source_location</span> <span class="k">const</span><span class="o">&</span> <span class="n">loc</span> <span class="p">)</span> <span class="k">noexcept</span><span class="p">;</span>
|
|
|
|
<span class="k">constexpr</span> <span class="kt">char</span> <span class="k">const</span><span class="o">*</span> <span class="n">file_name</span><span class="p">()</span> <span class="k">const</span> <span class="k">noexcept</span><span class="p">;</span>
|
|
<span class="k">constexpr</span> <span class="kt">char</span> <span class="k">const</span><span class="o">*</span> <span class="n">function_name</span><span class="p">()</span> <span class="k">const</span> <span class="k">noexcept</span><span class="p">;</span>
|
|
<span class="k">constexpr</span> <span class="kt">uint_least32_t</span> <span class="n">line</span><span class="p">()</span> <span class="k">const</span> <span class="k">noexcept</span><span class="p">;</span>
|
|
<span class="k">constexpr</span> <span class="kt">uint_least32_t</span> <span class="n">column</span><span class="p">()</span> <span class="k">const</span> <span class="k">noexcept</span><span class="p">;</span>
|
|
|
|
<span class="n">std</span><span class="o">::</span><span class="n">string</span> <span class="n">to_string</span><span class="p">()</span> <span class="k">const</span><span class="p">;</span>
|
|
<span class="p">};</span>
|
|
|
|
<span class="k">template</span><span class="o"><</span><span class="k">class</span> <span class="nc">E</span><span class="p">,</span> <span class="k">class</span> <span class="nc">T</span><span class="p">></span>
|
|
<span class="n">std</span><span class="o">::</span><span class="n">basic_ostream</span><span class="o"><</span><span class="n">E</span><span class="p">,</span> <span class="n">T</span><span class="o">></span> <span class="o">&</span>
|
|
<span class="k">operator</span><span class="o"><<</span><span class="p">(</span> <span class="n">std</span><span class="o">::</span><span class="n">basic_ostream</span><span class="o"><</span><span class="n">E</span><span class="p">,</span> <span class="n">T</span><span class="o">></span> <span class="o">&</span> <span class="n">os</span><span class="p">,</span> <span class="n">source_location</span> <span class="k">const</span> <span class="o">&</span> <span class="n">loc</span> <span class="p">);</span>
|
|
|
|
<span class="p">}</span> <span class="c1">// namespace boost</span>
|
|
|
|
<span class="cp">#define BOOST_CURRENT_LOCATION </span><span class="cm">/* see below */</span></code></pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="source_location">source_location</h3>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre class="rouge highlight"><code data-lang="c++"><span class="k">constexpr</span> <span class="n">source_location</span><span class="p">()</span> <span class="k">noexcept</span><span class="p">;</span></code></pre>
|
|
</div>
|
|
</div>
|
|
<div class="dlist">
|
|
<dl>
|
|
<dt class="hdlist1">Effects: </dt>
|
|
<dd>
|
|
<p>Constructs a <code>source_location</code> object for which <code>file_name()</code>
|
|
and <code>function_name()</code> return <code>""</code>, and <code>line()</code> and <code>column()</code> return <code>0</code>.</p>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre class="rouge highlight"><code data-lang="c++"><span class="k">constexpr</span> <span class="n">source_location</span><span class="p">(</span> <span class="kt">char</span> <span class="k">const</span><span class="o">*</span> <span class="n">file</span><span class="p">,</span> <span class="kt">uint_least32_t</span> <span class="n">line</span><span class="p">,</span>
|
|
<span class="kt">char</span> <span class="k">const</span><span class="o">*</span> <span class="n">function</span><span class="p">,</span> <span class="kt">uint_least32_t</span> <span class="n">column</span> <span class="o">=</span> <span class="mi">0</span> <span class="p">)</span> <span class="k">noexcept</span><span class="p">;</span></code></pre>
|
|
</div>
|
|
</div>
|
|
<div class="dlist">
|
|
<dl>
|
|
<dt class="hdlist1">Effects: </dt>
|
|
<dd>
|
|
<p>Constructs a <code>source_location</code> object for which <code>file_name()</code>
|
|
returns <code>file</code>, <code>function_name()</code> returns <code>function</code>, <code>line()</code> returns the
|
|
<code>line</code> argument and <code>column()</code> returns the <code>column</code> argument.</p>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre class="rouge highlight"><code data-lang="c++"><span class="k">constexpr</span> <span class="n">source_location</span><span class="p">(</span> <span class="n">std</span><span class="o">::</span><span class="n">source_location</span> <span class="k">const</span><span class="o">&</span> <span class="n">loc</span> <span class="p">)</span> <span class="k">noexcept</span><span class="p">;</span></code></pre>
|
|
</div>
|
|
</div>
|
|
<div class="dlist">
|
|
<dl>
|
|
<dt class="hdlist1">Effects: </dt>
|
|
<dd>
|
|
<p>Constructs a <code>source_location</code> object for which <code>file_name()</code>
|
|
returns <code>loc.file_name()</code>, <code>function_name()</code> returns <code>loc.function_name()</code>,
|
|
<code>line()</code> returns <code>loc.line()</code> and <code>column()</code> returns <code>loc.column()</code>.</p>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="to_string">to_string</h3>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre class="rouge highlight"><code data-lang="c++"><span class="n">std</span><span class="o">::</span><span class="n">string</span> <span class="n">to_string</span><span class="p">()</span> <span class="k">const</span><span class="p">;</span></code></pre>
|
|
</div>
|
|
</div>
|
|
<div class="dlist">
|
|
<dl>
|
|
<dt class="hdlist1">Returns: </dt>
|
|
<dd>
|
|
<p>a string representation of <code>*this</code>.</p>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="operator">operator<<</h3>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre class="rouge highlight"><code data-lang="c++"><span class="k">template</span><span class="o"><</span><span class="k">class</span> <span class="nc">E</span><span class="p">,</span> <span class="k">class</span> <span class="nc">T</span><span class="p">></span>
|
|
<span class="n">std</span><span class="o">::</span><span class="n">basic_ostream</span><span class="o"><</span><span class="n">E</span><span class="p">,</span> <span class="n">T</span><span class="o">></span> <span class="o">&</span>
|
|
<span class="k">operator</span><span class="o"><<</span><span class="p">(</span> <span class="n">std</span><span class="o">::</span><span class="n">basic_ostream</span><span class="o"><</span><span class="n">E</span><span class="p">,</span> <span class="n">T</span><span class="o">></span> <span class="o">&</span> <span class="n">os</span><span class="p">,</span> <span class="n">source_location</span> <span class="k">const</span> <span class="o">&</span> <span class="n">loc</span> <span class="p">);</span></code></pre>
|
|
</div>
|
|
</div>
|
|
<div class="dlist">
|
|
<dl>
|
|
<dt class="hdlist1">Effects: </dt>
|
|
<dd>
|
|
<p><code>os << loc.to_string()</code>.</p>
|
|
</dd>
|
|
<dt class="hdlist1">Returns: </dt>
|
|
<dd>
|
|
<p><code>os</code>.</p>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="boost_current_location">BOOST_CURRENT_LOCATION</h3>
|
|
<div class="paragraph">
|
|
<p>When <code>BOOST_DISABLE_CURRENT_LOCATION</code> is defined, the definition of
|
|
<code>BOOST_CURRENT_LOCATION</code> is:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre class="rouge highlight"><code data-lang="c++"><span class="cp">#define BOOST_CURRENT_LOCATION ::boost::source_location()</span></code></pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>This allows producing executables that contain no identifying information,
|
|
for security reasons.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Otherwise, <code>BOOST_CURRENT_LOCATION</code> is defined as the approximate equivalent
|
|
of</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre class="rouge highlight"><code data-lang="c++"><span class="cp">#define BOOST_CURRENT_LOCATION \
|
|
::boost::source_location(::std::source_location::current())</span></code></pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="changes">Revision History</h2>
|
|
<div class="sectionbody">
|
|
<div class="sect2">
|
|
<h3 id="changes_in_1_88_0">Changes in 1.88.0</h3>
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p>When <code>BOOST_ASSERT_HANDLER_IS_NORETURN</code> is defined, <code>boost::assertion_failed</code>
|
|
and <code>boost::assertion_failed_msg</code> are declared as <code>BOOST_NORETURN</code>.</p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="changes_in_1_79_0">Changes in 1.79.0</h3>
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p><code>source_location().file_name()</code> and <code>source_location().function_name()</code>
|
|
now return <code>""</code> instead of <code>"(unknown)"</code>.</p>
|
|
</li>
|
|
<li>
|
|
<p>Added a <code>source_location</code> constructor from <code>std::source_location</code>.</p>
|
|
</li>
|
|
<li>
|
|
<p>Changed <code>BOOST_CURRENT_LOCATION</code> to more closely match the behavior of
|
|
<code>std::source_location::current()</code>, such as being usable at top level or
|
|
as a default function argument.</p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="changes_in_1_78_0">Changes in 1.78.0</h3>
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p>Added <code>source_location::to_string</code>.</p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="changes_in_1_73_0">Changes in 1.73.0</h3>
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p>Added <code>source_location</code>.</p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="copyright_and_license">Appendix A: Copyright and License</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>This documentation is</p>
|
|
</div>
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p>Copyright 2002, 2007, 2014, 2017, 2019-2022 Peter Dimov</p>
|
|
</li>
|
|
<li>
|
|
<p>Copyright 2011 Beman Dawes</p>
|
|
</li>
|
|
<li>
|
|
<p>Copyright 2015 Ion Gaztañaga</p>
|
|
</li>
|
|
<li>
|
|
<p>Distributed under the <a href="http://www.boost.org/LICENSE_1_0.txt">Boost Software License, Version 1.0</a>.</p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div id="footer">
|
|
<div id="footer-text">
|
|
Last updated 2026-04-15 14:38:52 UTC
|
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|
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*:not(pre)>code { background: none; color: #600000; }
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:not(pre):not([class^=L])>code { background: none; color: #600000; }
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