1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>String_Ref</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="string_ref.html" title="String_Ref"> 8</head> 9<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 10<table cellpadding="2" width="100%"><tr> 11<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td> 12<td align="center"><a href="../../../../index.html">Home</a></td> 13<td align="center"><a href="../../../../libs/libraries.htm">Libraries</a></td> 14<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 15<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 16<td align="center"><a href="../../../../more/index.htm">More</a></td> 17</tr></table> 18<hr> 19<div class="spirit-nav"></div> 20<div class="article"> 21<div class="titlepage"> 22<div> 23<div><h2 class="title"> 24<a name="string_ref"></a>String_Ref</h2></div> 25<div><div class="authorgroup"><div class="author"><h3 class="author"> 26<span class="firstname">Marshall</span> <span class="surname">Clow</span> 27</h3></div></div></div> 28<div><p class="copyright">Copyright © 2012 Marshall Clow</p></div> 29<div><div class="legalnotice"> 30<a name="string_ref.legal"></a><p> 31 Distributed under the Boost Software License, Version 1.0. (See accompanying 32 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>) 33 </p> 34</div></div> 35</div> 36<hr> 37</div> 38<div class="toc"> 39<p><b>Table of Contents</b></p> 40<dl class="toc"> 41<dt><span class="section"><a href="string_ref.html#string_ref.overview">Overview</a></span></dt> 42<dt><span class="section"><a href="string_ref.html#string_ref.examples">Examples</a></span></dt> 43<dt><span class="section"><a href="string_ref.html#string_ref.reference">Reference </a></span></dt> 44<dt><span class="section"><a href="string_ref.html#string_ref.history">History</a></span></dt> 45</dl> 46</div> 47<div class="section"> 48<div class="titlepage"><div><div><h2 class="title" style="clear: both"> 49<a name="string_ref.overview"></a><a class="link" href="string_ref.html#string_ref.overview" title="Overview">Overview</a> 50</h2></div></div></div> 51<p> 52 Boost.StringRef is an implementation of Jeffrey Yaskin's <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3442.html" target="_top">N3442: 53 string_ref: a non-owning reference to a string</a>. 54 </p> 55<p> 56 When you are parsing/processing strings from some external source, frequently 57 you want to pass a piece of text to a procedure for specialized processing. 58 The canonical way to do this is as a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code>, 59 but that has certain drawbacks: 60 </p> 61<p> 62 1) If you are processing a buffer of text (say a HTTP response or the contents 63 of a file), then you have to create the string from the text you want to pass, 64 which involves memory allocation and copying of data. 65 </p> 66<p> 67 2) if a routine receives a constant <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code> 68 and wants to pass a portion of that string to another routine, then it must 69 create a new string of that substring. 70 </p> 71<p> 72 3) A routine receives a constant <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code> 73 and wants to return a portion of the string, then it must create a new string 74 to return. 75 </p> 76<p> 77 <code class="computeroutput"><span class="identifier">string_ref</span></code> is designed to solve 78 these efficiency problems. A <code class="computeroutput"><span class="identifier">string_ref</span></code> 79 is a read-only reference to a contiguous sequence of characters, and provides 80 much of the functionality of <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code>. 81 A <code class="computeroutput"><span class="identifier">string_ref</span></code> is cheap to create, 82 copy and pass by value, because it does not actually own the storage that it 83 points to. 84 </p> 85<p> 86 A <code class="computeroutput"><span class="identifier">string_ref</span></code> is implemented 87 as a small struct that contains a pointer to the start of the character data 88 and a count. A <code class="computeroutput"><span class="identifier">string_ref</span></code> is 89 cheap to create and cheap to copy. 90 </p> 91<p> 92 <code class="computeroutput"><span class="identifier">string_ref</span></code> acts as a container; 93 it includes all the methods that you would expect in a container, including 94 iteration support, <code class="computeroutput"><span class="keyword">operator</span> <span class="special">[]</span></code>, 95 <code class="computeroutput"><span class="identifier">at</span></code> and <code class="computeroutput"><span class="identifier">size</span></code>. 96 It can be used with any of the iterator-based algorithms in the STL - as long 97 as you don't need to change the underlying data (<code class="computeroutput"><span class="identifier">sort</span></code> 98 and <code class="computeroutput"><span class="identifier">remove</span></code>, for example, will 99 not work) 100 </p> 101<p> 102 Besides generic container functionality, <code class="computeroutput"><span class="identifier">string_ref</span></code> 103 provides a subset of the interface of <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code>. 104 This makes it easy to replace parameters of type <code class="computeroutput"><span class="keyword">const</span> 105 <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="special">&</span></code> 106 with <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">string_ref</span></code>. Like <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code>, 107 <code class="computeroutput"><span class="identifier">string_ref</span></code> has a static member 108 variable named <code class="computeroutput"><span class="identifier">npos</span></code> to denote 109 the result of failed searches, and to mean "the end". 110 </p> 111<p> 112 Because a <code class="computeroutput"><span class="identifier">string_ref</span></code> does not 113 own the data that it "points to", it introduces lifetime issues into 114 code that uses it. The programmer must ensure that the data that a <code class="computeroutput"><span class="identifier">string_ref</span></code> refers to exists as long as the 115 <code class="computeroutput"><span class="identifier">string_ref</span></code> does. 116 </p> 117</div> 118<div class="section"> 119<div class="titlepage"><div><div><h2 class="title" style="clear: both"> 120<a name="string_ref.examples"></a><a class="link" href="string_ref.html#string_ref.examples" title="Examples">Examples</a> 121</h2></div></div></div> 122<p> 123 Integrating <code class="computeroutput"><span class="identifier">string_ref</span></code> into 124 your code is fairly simple. Wherever you pass a <code class="computeroutput"><span class="keyword">const</span> 125 <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="special">&</span></code> 126 or <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code> as a parameter, that's a candidate 127 for passing a <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">string_ref</span></code>. 128 </p> 129<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">extract_part</span> <span class="special">(</span> <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="special">&</span><span class="identifier">bar</span> <span class="special">)</span> <span class="special">{</span> 130 <span class="keyword">return</span> <span class="identifier">bar</span><span class="special">.</span><span class="identifier">substr</span> <span class="special">(</span> <span class="number">2</span><span class="special">,</span> <span class="number">3</span> <span class="special">);</span> 131 <span class="special">}</span> 132 133<span class="keyword">if</span> <span class="special">(</span> <span class="identifier">extract_part</span> <span class="special">(</span> <span class="string">"ABCDEFG"</span> <span class="special">).</span><span class="identifier">front</span><span class="special">()</span> <span class="special">==</span> <span class="char">'C'</span> <span class="special">)</span> <span class="special">{</span> <span class="comment">/* do something */</span> <span class="special">}</span> 134</pre> 135<p> 136 Let's figure out what happens in this (contrived) example. 137 </p> 138<p> 139 First, a temporary string is created from the string literal <code class="computeroutput"><span class="string">"ABCDEFG"</span></code>, and it is passed (by reference) 140 to the routine <code class="computeroutput"><span class="identifier">extract_part</span></code>. 141 Then a second string is created in the call <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">::</span><span class="identifier">substr</span></code> 142 and returned to <code class="computeroutput"><span class="identifier">extract_part</span></code> 143 (this copy may be elided by RVO). Then <code class="computeroutput"><span class="identifier">extract_part</span></code> 144 returns that string back to the caller (again this copy may be elided). The 145 first temporary string is deallocated, and <code class="computeroutput"><span class="identifier">front</span></code> 146 is called on the second string, and then it is deallocated as well. 147 </p> 148<p> 149 Two <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code>s are created, and two copy operations. 150 That's (potentially) four memory allocations and deallocations, and the associated 151 copying of data. 152 </p> 153<p> 154 Now let's look at the same code with <code class="computeroutput"><span class="identifier">string_ref</span></code>: 155 </p> 156<pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">string_ref</span> <span class="identifier">extract_part</span> <span class="special">(</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">string_ref</span> <span class="identifier">bar</span> <span class="special">)</span> <span class="special">{</span> 157 <span class="keyword">return</span> <span class="identifier">bar</span><span class="special">.</span><span class="identifier">substr</span> <span class="special">(</span> <span class="number">2</span><span class="special">,</span> <span class="number">3</span> <span class="special">);</span> 158 <span class="special">}</span> 159 160<span class="keyword">if</span> <span class="special">(</span> <span class="identifier">extract_part</span> <span class="special">(</span> <span class="string">"ABCDEFG"</span> <span class="special">).</span><span class="identifier">front</span><span class="special">()</span> <span class="special">==</span> <span class="string">"C"</span> <span class="special">)</span> <span class="special">{</span> <span class="comment">/* do something */</span> <span class="special">}</span> 161</pre> 162<p> 163 No memory allocations. No copying of character data. No changes to the code 164 other than the types. There are two <code class="computeroutput"><span class="identifier">string_ref</span></code>s 165 created, and two <code class="computeroutput"><span class="identifier">string_ref</span></code>s 166 copied, but those are cheap operations. 167 </p> 168</div> 169<div class="section"> 170<div class="titlepage"><div><div><h2 class="title" style="clear: both"> 171<a name="string_ref.reference"></a><a class="link" href="string_ref.html#string_ref.reference" title="Reference">Reference </a> 172</h2></div></div></div> 173<p> 174 The header file "string_ref.hpp" defines a template <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">basic_string_ref</span></code>, 175 and four specializations - for <code class="computeroutput"><span class="keyword">char</span></code> 176 / <code class="computeroutput"><span class="keyword">wchar_t</span></code> / <code class="computeroutput"><span class="keyword">char16_t</span></code> 177 / <code class="computeroutput"><span class="keyword">char32_t</span></code> . 178 </p> 179<p> 180 <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">utility</span><span class="special">/</span><span class="identifier">string_ref</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code> 181 </p> 182<p> 183 Construction and copying: 184 </p> 185<pre class="programlisting"><span class="identifier">BOOST_CONSTEXPR</span> <span class="identifier">basic_string_ref</span> <span class="special">();</span> <span class="comment">// Constructs an empty string_ref</span> 186<span class="identifier">BOOST_CONSTEXPR</span> <span class="identifier">basic_string_ref</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">str</span><span class="special">);</span> <span class="comment">// Constructs from a NULL-terminated string</span> 187<span class="identifier">BOOST_CONSTEXPR</span> <span class="identifier">basic_string_ref</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">str</span><span class="special">,</span> <span class="identifier">size_type</span> <span class="identifier">len</span><span class="special">);</span> <span class="comment">// Constructs from a pointer, length pair</span> 188<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Allocator</span><span class="special">></span> 189<span class="identifier">basic_string_ref</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>&</span> <span class="identifier">str</span><span class="special">);</span> <span class="comment">// Constructs from a std::string</span> 190<span class="identifier">basic_string_ref</span> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_string_ref</span> <span class="special">&</span><span class="identifier">rhs</span><span class="special">);</span> 191<span class="identifier">basic_string_ref</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">=(</span><span class="keyword">const</span> <span class="identifier">basic_string_ref</span> <span class="special">&</span><span class="identifier">rhs</span><span class="special">);</span> 192</pre> 193<p> 194 <code class="computeroutput"><span class="identifier">string_ref</span></code> does not define 195 a move constructor nor a move-assignment operator because copying a <code class="computeroutput"><span class="identifier">string_ref</span></code> is just a cheap as moving one. 196 </p> 197<p> 198 Basic container-like functions: 199 </p> 200<pre class="programlisting"><span class="identifier">BOOST_CONSTEXPR</span> <span class="identifier">size_type</span> <span class="identifier">size</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">;</span> 201<span class="identifier">BOOST_CONSTEXPR</span> <span class="identifier">size_type</span> <span class="identifier">length</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">;</span> 202<span class="identifier">BOOST_CONSTEXPR</span> <span class="identifier">size_type</span> <span class="identifier">max_size</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">;</span> 203<span class="identifier">BOOST_CONSTEXPR</span> <span class="keyword">bool</span> <span class="identifier">empty</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">;</span> 204 205<span class="comment">// All iterators are const_iterators</span> 206<span class="identifier">BOOST_CONSTEXPR</span> <span class="identifier">const_iterator</span> <span class="identifier">begin</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">;</span> 207<span class="identifier">BOOST_CONSTEXPR</span> <span class="identifier">const_iterator</span> <span class="identifier">cbegin</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">;</span> 208<span class="identifier">BOOST_CONSTEXPR</span> <span class="identifier">const_iterator</span> <span class="identifier">end</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">;</span> 209<span class="identifier">BOOST_CONSTEXPR</span> <span class="identifier">const_iterator</span> <span class="identifier">cend</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">;</span> 210<span class="identifier">const_reverse_iterator</span> <span class="identifier">rbegin</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">;</span> 211<span class="identifier">const_reverse_iterator</span> <span class="identifier">crbegin</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">;</span> 212<span class="identifier">const_reverse_iterator</span> <span class="identifier">rend</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">;</span> 213<span class="identifier">const_reverse_iterator</span> <span class="identifier">crend</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">;</span> 214</pre> 215<p> 216 Access to the individual elements (all of which are const): 217 </p> 218<pre class="programlisting"><span class="identifier">BOOST_CONSTEXPR</span> <span class="keyword">const</span> <span class="identifier">charT</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">[](</span><span class="identifier">size_type</span> <span class="identifier">pos</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">;</span> 219<span class="keyword">const</span> <span class="identifier">charT</span><span class="special">&</span> <span class="identifier">at</span><span class="special">(</span><span class="identifier">size_t</span> <span class="identifier">pos</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">;</span> 220<span class="identifier">BOOST_CONSTEXPR</span> <span class="keyword">const</span> <span class="identifier">charT</span><span class="special">&</span> <span class="identifier">front</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">;</span> 221<span class="identifier">BOOST_CONSTEXPR</span> <span class="keyword">const</span> <span class="identifier">charT</span><span class="special">&</span> <span class="identifier">back</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">;</span> 222<span class="identifier">BOOST_CONSTEXPR</span> <span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">data</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">;</span> 223</pre> 224<p> 225 Modifying the <code class="computeroutput"><span class="identifier">string_ref</span></code> (but 226 not the underlying data): 227 </p> 228<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">clear</span><span class="special">();</span> 229<span class="keyword">void</span> <span class="identifier">remove_prefix</span><span class="special">(</span><span class="identifier">size_type</span> <span class="identifier">n</span><span class="special">);</span> 230<span class="keyword">void</span> <span class="identifier">remove_suffix</span><span class="special">(</span><span class="identifier">size_type</span> <span class="identifier">n</span><span class="special">);</span> 231</pre> 232<p> 233 Searching: 234 </p> 235<pre class="programlisting"><span class="identifier">size_type</span> <span class="identifier">find</span><span class="special">(</span><span class="identifier">basic_string_ref</span> <span class="identifier">s</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">;</span> 236<span class="identifier">size_type</span> <span class="identifier">find</span><span class="special">(</span><span class="identifier">charT</span> <span class="identifier">c</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">;</span> 237<span class="identifier">size_type</span> <span class="identifier">rfind</span><span class="special">(</span><span class="identifier">basic_string_ref</span> <span class="identifier">s</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">;</span> 238<span class="identifier">size_type</span> <span class="identifier">rfind</span><span class="special">(</span><span class="identifier">charT</span> <span class="identifier">c</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">;</span> 239<span class="identifier">size_type</span> <span class="identifier">find_first_of</span><span class="special">(</span><span class="identifier">charT</span> <span class="identifier">c</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">;</span> 240<span class="identifier">size_type</span> <span class="identifier">find_last_of</span> <span class="special">(</span><span class="identifier">charT</span> <span class="identifier">c</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">;</span> 241 242<span class="identifier">size_type</span> <span class="identifier">find_first_of</span><span class="special">(</span><span class="identifier">basic_string_ref</span> <span class="identifier">s</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">;</span> 243<span class="identifier">size_type</span> <span class="identifier">find_last_of</span><span class="special">(</span><span class="identifier">basic_string_ref</span> <span class="identifier">s</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">;</span> 244<span class="identifier">size_type</span> <span class="identifier">find_first_not_of</span><span class="special">(</span><span class="identifier">basic_string_ref</span> <span class="identifier">s</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">;</span> 245<span class="identifier">size_type</span> <span class="identifier">find_first_not_of</span><span class="special">(</span><span class="identifier">charT</span> <span class="identifier">c</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">;</span> 246<span class="identifier">size_type</span> <span class="identifier">find_last_not_of</span><span class="special">(</span><span class="identifier">basic_string_ref</span> <span class="identifier">s</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">;</span> 247<span class="identifier">size_type</span> <span class="identifier">find_last_not_of</span><span class="special">(</span><span class="identifier">charT</span> <span class="identifier">c</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">;</span> 248</pre> 249<p> 250 String-like operations: 251 </p> 252<pre class="programlisting"><span class="identifier">BOOST_CONSTEXPR</span> <span class="identifier">basic_string_ref</span> <span class="identifier">substr</span><span class="special">(</span><span class="identifier">size_type</span> <span class="identifier">pos</span><span class="special">,</span> <span class="identifier">size_type</span> <span class="identifier">n</span><span class="special">=</span><span class="identifier">npos</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">;</span> <span class="comment">// Creates a new string_ref</span> 253<span class="keyword">bool</span> <span class="identifier">starts_with</span><span class="special">(</span><span class="identifier">charT</span> <span class="identifier">c</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">;</span> 254<span class="keyword">bool</span> <span class="identifier">starts_with</span><span class="special">(</span><span class="identifier">basic_string_ref</span> <span class="identifier">x</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">;</span> 255<span class="keyword">bool</span> <span class="identifier">ends_with</span><span class="special">(</span><span class="identifier">charT</span> <span class="identifier">c</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">;</span> 256<span class="keyword">bool</span> <span class="identifier">ends_with</span><span class="special">(</span><span class="identifier">basic_string_ref</span> <span class="identifier">x</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">;</span> 257</pre> 258</div> 259<div class="section"> 260<div class="titlepage"><div><div><h2 class="title" style="clear: both"> 261<a name="string_ref.history"></a><a class="link" href="string_ref.html#string_ref.history" title="History">History</a> 262</h2></div></div></div> 263<h4> 264<a name="string_ref.history.h0"></a> 265 <span class="phrase"><a name="string_ref.history.boost_1_71"></a></span><a class="link" href="string_ref.html#string_ref.history.boost_1_71">boost 266 1.71</a> 267 </h4> 268<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"> 269 Glen Fernandes updated the implementation of the stream insertion operator 270 to write directly to the <code class="computeroutput"><span class="identifier">basic_streambuf</span></code> 271 and refactored that functionality into a common utility. 272 </li></ul></div> 273<h4> 274<a name="string_ref.history.h1"></a> 275 <span class="phrase"><a name="string_ref.history.boost_1_53"></a></span><a class="link" href="string_ref.html#string_ref.history.boost_1_53">boost 276 1.53</a> 277 </h4> 278<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"> 279 Introduced 280 </li></ul></div> 281</div> 282</div> 283<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 284<td align="left"><p><small>Last revised: August 11, 2020 at 14:59:07 GMT</small></p></td> 285<td align="right"><div class="copyright-footer"></div></td> 286</tr></table> 287<hr> 288<div class="spirit-nav"></div> 289</body> 290</html> 291
