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272 lines
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<title>Dynamic buffer requirements (version 2)</title>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
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<a accesskey="p" href="DynamicBuffer_v1.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="Endpoint.html"><img src="../../next.png" alt="Next"></a>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="asio.reference.DynamicBuffer_v2"></a><a class="link" href="DynamicBuffer_v2.html" title="Dynamic buffer requirements (version 2)">Dynamic buffer requirements
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(version 2)</a>
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</h3></div></div></div>
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<p>
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A dynamic buffer encapsulates memory storage that may be automatically resized
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as required.
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</p>
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<p>
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A dynamic buffer type <code class="computeroutput"><span class="identifier">X</span></code> shall
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satisfy the requirements of <code class="computeroutput"><span class="identifier">CopyConstructible</span></code>
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(C++ Std, [copyconstructible]) types in addition to those listed below.
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</p>
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<p>
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In the table below, <code class="computeroutput"><span class="identifier">X</span></code> denotes
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a dynamic buffer class, <code class="computeroutput"><span class="identifier">x</span></code>
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denotes a value of type <code class="computeroutput"><span class="identifier">X</span><span class="special">&</span></code>, <code class="computeroutput"><span class="identifier">x1</span></code>
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denotes values of type <code class="computeroutput"><span class="keyword">const</span> <span class="identifier">X</span><span class="special">&</span></code>,
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<code class="computeroutput"><span class="identifier">pos</span></code> and <code class="computeroutput"><span class="identifier">n</span></code>
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denote values of type <code class="computeroutput"><span class="identifier">size_t</span></code>,
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and <code class="computeroutput"><span class="identifier">u</span></code> denotes an identifier.
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</p>
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<div class="table">
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<a name="asio.reference.DynamicBuffer_v2.t0"></a><p class="title"><b>Table 13. DynamicBuffer_v2 requirements</b></p>
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<div class="table-contents"><table class="table" summary="DynamicBuffer_v2 requirements">
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<colgroup>
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<col>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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expression
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</p>
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</th>
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<th>
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<p>
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type
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</p>
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</th>
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<th>
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<p>
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assertion/note<br> pre/post-conditions
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</p>
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</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">X</span><span class="special">::</span><span class="identifier">const_buffers_type</span></code>
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</p>
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</td>
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<td>
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<p>
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type meeting <a class="link" href="ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a>
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requirements.
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</p>
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</td>
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<td>
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<p>
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This type represents the underlying memory as a sequence of @c
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const_buffer objects.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">X</span><span class="special">::</span><span class="identifier">mutable_buffers_type</span></code>
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</p>
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</td>
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<td>
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<p>
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type meeting <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a>
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requirements.
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</p>
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</td>
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<td>
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<p>
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This type represents the underlying memory as a sequence of @c
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mutable_buffer objects.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">x1</span><span class="special">.</span><span class="identifier">size</span><span class="special">()</span></code>
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">size_t</span></code>
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</p>
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</td>
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<td>
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<p>
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Returns the size, in bytes, of the underlying memory.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">x1</span><span class="special">.</span><span class="identifier">max_size</span><span class="special">()</span></code>
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">size_t</span></code>
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</p>
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</td>
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<td>
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<p>
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Returns the permitted maximum size of the underlying memory.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">x1</span><span class="special">.</span><span class="identifier">capacity</span><span class="special">()</span></code>
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">size_t</span></code>
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</p>
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</td>
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<td>
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<p>
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Returns the maximum size to which the underlying memory can grow
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without requiring reallocation.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">x1</span><span class="special">.</span><span class="identifier">data</span><span class="special">(</span><span class="identifier">pos</span><span class="special">,</span>
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<span class="identifier">n</span><span class="special">)</span></code>
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">X</span><span class="special">::</span><span class="identifier">const_buffers_type</span></code>
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</p>
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</td>
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<td>
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<p>
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Returns a constant buffer sequence <code class="computeroutput"><span class="identifier">u</span></code>
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that represents the underlying memory beginning at offset <code class="computeroutput"><span class="identifier">pos</span></code>, and where <code class="computeroutput"><span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">u</span><span class="special">)</span>
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<span class="special"><=</span> <span class="identifier">n</span></code>.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">x</span><span class="special">.</span><span class="identifier">data</span><span class="special">(</span><span class="identifier">pos</span><span class="special">,</span>
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<span class="identifier">n</span><span class="special">)</span></code>
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">X</span><span class="special">::</span><span class="identifier">mutable_buffers_type</span></code>
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</p>
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</td>
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<td>
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<p>
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Returns a mutable buffer sequence <code class="computeroutput"><span class="identifier">u</span></code>
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that represents the underlying memory beginning at offset <code class="computeroutput"><span class="identifier">pos</span></code>, and where <code class="computeroutput"><span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">u</span><span class="special">)</span>
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<span class="special"><=</span> <span class="identifier">n</span></code>.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">x</span><span class="special">.</span><span class="identifier">grow</span><span class="special">(</span><span class="identifier">n</span><span class="special">)</span></code>
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</p>
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</td>
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<td>
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</td>
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<td>
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<p>
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Requires: <code class="computeroutput"><span class="identifier">size</span><span class="special">()</span> <span class="special">+</span> <span class="identifier">n</span> <span class="special"><=</span>
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<span class="identifier">max_size</span><span class="special">()</span></code>.<br>
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<br> Extends the underlying memory to accommodate <code class="computeroutput"><span class="identifier">n</span></code> additional bytes at the end.
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The dynamic buffer reallocates memory as required. All constant
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or mutable buffer sequences previously obtained using <code class="computeroutput"><span class="identifier">data</span><span class="special">()</span></code>
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are invalidated.<br> <br> Throws: <code class="computeroutput"><span class="identifier">length_error</span></code>
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if <code class="computeroutput"><span class="identifier">size</span><span class="special">()</span>
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<span class="special">+</span> <span class="identifier">n</span>
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<span class="special">></span> <span class="identifier">max_size</span><span class="special">()</span></code>.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">x</span><span class="special">.</span><span class="identifier">shrink</span><span class="special">(</span><span class="identifier">n</span><span class="special">)</span></code>
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</p>
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</td>
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<td>
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</td>
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<td>
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<p>
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Removes <code class="computeroutput"><span class="identifier">n</span></code> bytes
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from the end of the underlying memory. If <code class="computeroutput"><span class="identifier">n</span></code>
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is greater than the size of the underlying memory, the entire underlying
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memory is emptied. All constant or mutable buffer sequences previously
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obtained using <code class="computeroutput"><span class="identifier">data</span><span class="special">()</span></code> are invalidated.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">x</span><span class="special">.</span><span class="identifier">consume</span><span class="special">(</span><span class="identifier">n</span><span class="special">)</span></code>
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</p>
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</td>
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<td>
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</td>
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<td>
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<p>
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Removes <code class="computeroutput"><span class="identifier">n</span></code> bytes
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from the beginning of the underlying memory. If <code class="computeroutput"><span class="identifier">n</span></code>
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is greater than the size of the underlying memory, the entire underlying
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memory is emptied. All constant or mutable buffer sequences previously
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obtained using <code class="computeroutput"><span class="identifier">data</span><span class="special">()</span></code> are invalidated.
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<br class="table-break">
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</div>
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<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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>)
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</p>
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</div>
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<hr>
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<div class="spirit-nav">
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<a accesskey="p" href="DynamicBuffer_v1.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="Endpoint.html"><img src="../../next.png" alt="Next"></a>
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</body>
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</html>
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