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<div class="chapter">
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<div><h2 class="title">
<a name="static_string"></a>Boost.StaticString</h2></div>
<div><div class="author"><h3 class="author">
<span class="firstname">Krystian</span> <span class="surname">Stasiowski</span>
</h3></div></div>
<div><div class="author"><h3 class="author">
<span class="firstname">Vinnie</span> <span class="surname">Falco</span>
</h3></div></div>
<div><p class="copyright">Copyright © 2019, 2020 Krystian Stasiowski</p></div>
<div><p class="copyright">Copyright © 2016-2019 Vinnie
Falco</p></div>
<div><div class="legalnotice">
<a name="static_string.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></div>
<h3>
<a name="static_string.h0"></a>
<span class="phrase"><a name="static_string.introduction"></a></span><a class="link" href="index.html#static_string.introduction">Introduction</a>
</h3>
<p>
This library provides a dynamically resizable string of characters with compile-time
fixed capacity and contiguous embedded storage in which the characters are placed
within the string object itself. Its API closely resembles that of <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code>.
</p>
<h3>
<a name="static_string.h1"></a>
<span class="phrase"><a name="static_string.motivation"></a></span><a class="link" href="index.html#static_string.motivation">Motivation</a>
</h3>
<p>
A fixed capacity string is useful when:
</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Memory allocation is not possible, e.g., embedded environments without a
free store, where only a stack and the static memory segment are available.
</li>
<li class="listitem">
Memory allocation imposes an unacceptable performance penalty. e.g., with
respect to latency.
</li>
<li class="listitem">
Allocation of objects with complex lifetimes in the static-memory segment
is required.
</li>
<li class="listitem">
A dynamically-resizable string is required within <code class="computeroutput"><span class="keyword">constexpr</span></code>
functions.
</li>
<li class="listitem">
The storage location of the static_vector elements is required to be within
the string object itself (e.g. to support <code class="computeroutput"><span class="identifier">memcpy</span></code>
for serialization purposes).
</li>
</ul></div>
<h3>
<a name="static_string.h2"></a>
<span class="phrase"><a name="static_string.requirements"></a></span><a class="link" href="index.html#static_string.requirements">Requirements</a>
</h3>
<p>
The library is usable in two different modes: standalone and Boost dependent.
This library defaults to Boost dependent mode; standalone mode is opt-in through
the use of a configuration macro.
</p>
<p>
When in Boost dependent mode, the library requires the use of at least C++11,
in addition to Boost.Core, Boost.Utility, and Boost.ContainerHash. In standalone
mode, C++17 is required but no libraries except for the standard library are
needed.
</p>
<h3>
<a name="static_string.h3"></a>
<span class="phrase"><a name="static_string.design"></a></span><a class="link" href="index.html#static_string.design">Design</a>
</h3>
<p>
The over-arching design goal is to resemble the interface and behavior of <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code>
as much as possible. When any operation would exceed the maximum allowed size
of the string, <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">length_error</span></code> is thrown if exceptions are enabled.
All algorithms which throw exceptions provide the strong exception safety guarantee.
This is intended to be a drop in replacement for <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code>.
</p>
<p>
The API of <code class="computeroutput"><span class="identifier">static_string</span></code> only
diverges from <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code> in few places, one of which is the addition
of the <code class="computeroutput"><span class="identifier">subview</span></code> function, for
which this implementation returns a string view instead of <code class="computeroutput"><span class="identifier">static_string</span></code>,
and certain functions that will never throw are marked as <code class="computeroutput"><span class="keyword">noexcept</span></code>,
which diverges from those of <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code>. The
available overloads for <code class="computeroutput"><span class="identifier">static_string</span></code>
are identical to those of <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code>.
</p>
<h3>
<a name="static_string.h4"></a>
<span class="phrase"><a name="static_string.iterators"></a></span><a class="link" href="index.html#static_string.iterators">Iterators</a>
</h3>
<p>
The iterator invalidation rules differ from those of <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code>:
</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Moving a <code class="computeroutput"><span class="identifier">static_string</span></code> invalidates
all iterators
</li>
<li class="listitem">
Swapping two <code class="computeroutput"><span class="identifier">static_string</span></code>s
invalidates all iterators
</li>
</ul></div>
<h3>
<a name="static_string.h5"></a>
<span class="phrase"><a name="static_string.optimizations"></a></span><a class="link" href="index.html#static_string.optimizations">Optimizations</a>
</h3>
<p>
Depending on the character type and size used for a specialization of <code class="computeroutput"><span class="identifier">static_string</span></code>, certain optimizations are used
to reduce the size of the class type. Given the name of a specialization of the
form <code class="computeroutput"><span class="identifier">basic_static_string</span><span class="special">&lt;</span><span class="identifier">N</span><span class="special">,</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;</span></code>:
</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
If <code class="computeroutput"><span class="identifier">N</span></code> is 0, then the class
has no non-static data members. Given two objects <code class="computeroutput"><span class="identifier">a</span></code>
and <code class="computeroutput"><span class="identifier">b</span></code> of type <code class="computeroutput"><span class="identifier">basic_static_string</span><span class="special">&lt;</span><span class="number">0</span><span class="special">,</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;</span></code> and <code class="computeroutput"><span class="identifier">static_string</span><span class="special">&lt;</span><span class="number">0</span><span class="special">,</span>
<span class="identifier">U</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">&gt;</span></code>
respectively, the pointer value returned by <code class="computeroutput"><span class="identifier">data</span><span class="special">()</span></code> will be the same if <code class="computeroutput"><span class="identifier">T</span></code>
and <code class="computeroutput"><span class="identifier">U</span></code> are the same.
</li>
<li class="listitem">
Otherwise, the type of the member used to store the size of the <code class="computeroutput"><span class="identifier">static_string</span></code> will be the smallest standard
unsigned integer type that can represent the value <code class="computeroutput"><span class="identifier">N</span></code>.
</li>
</ul></div>
<h3>
<a name="static_string.h6"></a>
<span class="phrase"><a name="static_string.configuration"></a></span><a class="link" href="index.html#static_string.configuration">Configuration</a>
</h3>
<p>
Certain features can be enabled and disabled though defining configuration macros.
The macros and the associated feature they control are:
</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
<code class="computeroutput"><span class="identifier">BOOST_STATIC_STRING_STANDALONE</span></code>:
When defined, the library is put into standalone mode.
</li></ul></div>
<h3>
<a name="static_string.h7"></a>
<span class="phrase"><a name="static_string.acknowledgments"></a></span><a class="link" href="index.html#static_string.acknowledgments">Acknowledgments</a>
</h3>
<p>
Thanks to <a href="https://github.com/K-ballo" target="_top">Agustín Bergé</a>, <a href="https://github.com/pdimov" target="_top">Peter Dimov</a>, <a href="https://github.com/glenfe" target="_top">Glen
Fernandes</a>, and <a href="https://github.com/LeonineKing1199" target="_top">Christian
Mazakas</a> for their constant feedback and guidance during the development
of this library.
</p>
<p>
The development of this library is sponsored by <a href="https://cppalliance.org" target="_top">The
C++ Alliance</a>.
</p>
<h3>
<a name="static_string.h8"></a>
<span class="phrase"><a name="static_string.reference"></a></span><a class="link" href="index.html#static_string.reference">Reference</a>
</h3>
<p>
Defined in namespace <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">static_strings</span></code>:
</p>
<p>
<a class="link" href="static_string/ref/boost__static_strings__basic_static_string.html" title="basic_static_string"><code class="computeroutput"><span class="identifier">basic_static_string</span></code></a>
</p>
</div>
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<td align="left"><p><small>Last revised: April 13, 2021 at 16:25:32 GMT</small></p></td>
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