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- <div><h2 class="title">
- <a name="string_ref"></a>String_Ref</h2></div>
- <div><div class="authorgroup"><div class="author"><h3 class="author">
- <span class="firstname">Marshall</span> <span class="surname">Clow</span>
- </h3></div></div></div>
- <div><p class="copyright">Copyright © 2012 Marshall Clow</p></div>
- <div><div class="legalnotice">
- <a name="string_ref.legal"></a><p>
- Distributed under the Boost Software License, Version 1.0. (See accompanying
- 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>)
- </p>
- </div></div>
- </div>
- <hr>
- </div>
- <div class="toc">
- <p><b>Table of Contents</b></p>
- <dl class="toc">
- <dt><span class="section"><a href="string_ref.html#string_ref.overview">Overview</a></span></dt>
- <dt><span class="section"><a href="string_ref.html#string_ref.examples">Examples</a></span></dt>
- <dt><span class="section"><a href="string_ref.html#string_ref.reference">Reference </a></span></dt>
- <dt><span class="section"><a href="string_ref.html#string_ref.history">History</a></span></dt>
- </dl>
- </div>
- <div class="section">
- <div class="titlepage"><div><div><h2 class="title" style="clear: both">
- <a name="string_ref.overview"></a><a class="link" href="string_ref.html#string_ref.overview" title="Overview">Overview</a>
- </h2></div></div></div>
- <p>
- 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:
- string_ref: a non-owning reference to a string</a>.
- </p>
- <p>
- When you are parsing/processing strings from some external source, frequently
- you want to pass a piece of text to a procedure for specialized processing.
- 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>,
- but that has certain drawbacks:
- </p>
- <p>
- 1) If you are processing a buffer of text (say a HTTP response or the contents
- of a file), then you have to create the string from the text you want to pass,
- which involves memory allocation and copying of data.
- </p>
- <p>
- 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>
- and wants to pass a portion of that string to another routine, then it must
- create a new string of that substring.
- </p>
- <p>
- 3) A routine receives a constant <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code>
- and wants to return a portion of the string, then it must create a new string
- to return.
- </p>
- <p>
- <code class="computeroutput"><span class="identifier">string_ref</span></code> is designed to solve
- these efficiency problems. A <code class="computeroutput"><span class="identifier">string_ref</span></code>
- is a read-only reference to a contiguous sequence of characters, and provides
- much of the functionality of <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code>.
- A <code class="computeroutput"><span class="identifier">string_ref</span></code> is cheap to create,
- copy and pass by value, because it does not actually own the storage that it
- points to.
- </p>
- <p>
- A <code class="computeroutput"><span class="identifier">string_ref</span></code> is implemented
- as a small struct that contains a pointer to the start of the character data
- and a count. A <code class="computeroutput"><span class="identifier">string_ref</span></code> is
- cheap to create and cheap to copy.
- </p>
- <p>
- <code class="computeroutput"><span class="identifier">string_ref</span></code> acts as a container;
- it includes all the methods that you would expect in a container, including
- iteration support, <code class="computeroutput"><span class="keyword">operator</span> <span class="special">[]</span></code>,
- <code class="computeroutput"><span class="identifier">at</span></code> and <code class="computeroutput"><span class="identifier">size</span></code>.
- It can be used with any of the iterator-based algorithms in the STL - as long
- as you don't need to change the underlying data (<code class="computeroutput"><span class="identifier">sort</span></code>
- and <code class="computeroutput"><span class="identifier">remove</span></code>, for example, will
- not work)
- </p>
- <p>
- Besides generic container functionality, <code class="computeroutput"><span class="identifier">string_ref</span></code>
- 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>.
- This makes it easy to replace parameters of type <code class="computeroutput"><span class="keyword">const</span>
- <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="special">&</span></code>
- 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>,
- <code class="computeroutput"><span class="identifier">string_ref</span></code> has a static member
- variable named <code class="computeroutput"><span class="identifier">npos</span></code> to denote
- the result of failed searches, and to mean "the end".
- </p>
- <p>
- Because a <code class="computeroutput"><span class="identifier">string_ref</span></code> does not
- own the data that it "points to", it introduces lifetime issues into
- 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
- <code class="computeroutput"><span class="identifier">string_ref</span></code> does.
- </p>
- </div>
- <div class="section">
- <div class="titlepage"><div><div><h2 class="title" style="clear: both">
- <a name="string_ref.examples"></a><a class="link" href="string_ref.html#string_ref.examples" title="Examples">Examples</a>
- </h2></div></div></div>
- <p>
- Integrating <code class="computeroutput"><span class="identifier">string_ref</span></code> into
- your code is fairly simple. Wherever you pass a <code class="computeroutput"><span class="keyword">const</span>
- <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="special">&</span></code>
- 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
- for passing a <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">string_ref</span></code>.
- </p>
- <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>
- <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>
- <span class="special">}</span>
- <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>
- </pre>
- <p>
- Let's figure out what happens in this (contrived) example.
- </p>
- <p>
- 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)
- to the routine <code class="computeroutput"><span class="identifier">extract_part</span></code>.
- 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>
- and returned to <code class="computeroutput"><span class="identifier">extract_part</span></code>
- (this copy may be elided by RVO). Then <code class="computeroutput"><span class="identifier">extract_part</span></code>
- returns that string back to the caller (again this copy may be elided). The
- first temporary string is deallocated, and <code class="computeroutput"><span class="identifier">front</span></code>
- is called on the second string, and then it is deallocated as well.
- </p>
- <p>
- 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.
- That's (potentially) four memory allocations and deallocations, and the associated
- copying of data.
- </p>
- <p>
- Now let's look at the same code with <code class="computeroutput"><span class="identifier">string_ref</span></code>:
- </p>
- <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>
- <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>
- <span class="special">}</span>
- <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>
- </pre>
- <p>
- No memory allocations. No copying of character data. No changes to the code
- other than the types. There are two <code class="computeroutput"><span class="identifier">string_ref</span></code>s
- created, and two <code class="computeroutput"><span class="identifier">string_ref</span></code>s
- copied, but those are cheap operations.
- </p>
- </div>
- <div class="section">
- <div class="titlepage"><div><div><h2 class="title" style="clear: both">
- <a name="string_ref.reference"></a><a class="link" href="string_ref.html#string_ref.reference" title="Reference">Reference </a>
- </h2></div></div></div>
- <p>
- 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>,
- and four specializations - for <code class="computeroutput"><span class="keyword">char</span></code>
- / <code class="computeroutput"><span class="keyword">wchar_t</span></code> / <code class="computeroutput"><span class="keyword">char16_t</span></code>
- / <code class="computeroutput"><span class="keyword">char32_t</span></code> .
- </p>
- <p>
- <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>
- </p>
- <p>
- Construction and copying:
- </p>
- <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>
- <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>
- <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>
- <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Allocator</span><span class="special">></span>
- <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>
- <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>
- <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>
- </pre>
- <p>
- <code class="computeroutput"><span class="identifier">string_ref</span></code> does not define
- 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.
- </p>
- <p>
- Basic container-like functions:
- </p>
- <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>
- <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>
- <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>
- <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>
- <span class="comment">// All iterators are const_iterators</span>
- <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>
- <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>
- <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>
- <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>
- <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>
- <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>
- <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>
- <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>
- </pre>
- <p>
- Access to the individual elements (all of which are const):
- </p>
- <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>
- <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>
- <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>
- <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>
- <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>
- </pre>
- <p>
- Modifying the <code class="computeroutput"><span class="identifier">string_ref</span></code> (but
- not the underlying data):
- </p>
- <pre class="programlisting"><span class="keyword">void</span> <span class="identifier">clear</span><span class="special">();</span>
- <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>
- <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>
- </pre>
- <p>
- Searching:
- </p>
- <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>
- <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>
- <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>
- <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>
- <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>
- <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>
- <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>
- <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>
- <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>
- <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>
- <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>
- <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>
- </pre>
- <p>
- String-like operations:
- </p>
- <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>
- <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>
- <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>
- <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>
- <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>
- </pre>
- </div>
- <div class="section">
- <div class="titlepage"><div><div><h2 class="title" style="clear: both">
- <a name="string_ref.history"></a><a class="link" href="string_ref.html#string_ref.history" title="History">History</a>
- </h2></div></div></div>
- <h4>
- <a name="string_ref.history.h0"></a>
- <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
- 1.71</a>
- </h4>
- <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
- Glen Fernandes updated the implementation of the stream insertion operator
- to write directly to the <code class="computeroutput"><span class="identifier">basic_streambuf</span></code>
- and refactored that functionality into a common utility.
- </li></ul></div>
- <h4>
- <a name="string_ref.history.h1"></a>
- <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
- 1.53</a>
- </h4>
- <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
- Introduced
- </li></ul></div>
- </div>
- </div>
- <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
- <td align="left"><p><small>Last revised: December 10, 2019 at 00:21:48 GMT</small></p></td>
- <td align="right"><div class="copyright-footer"></div></td>
- </tr></table>
- <hr>
- <div class="spirit-nav"></div>
- </body>
- </html>
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