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<title>Dynamic buffer requirements (version 2)</title>
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_asio.reference.DynamicBuffer_v2"></a><a class="link" href="DynamicBuffer_v2.html" title="Dynamic buffer requirements (version 2)">Dynamic buffer
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requirements (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">X</code> shall satisfy the requirements of <code class="computeroutput">CopyConstructible</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">X</code> denotes a dynamic buffer class, <code class="computeroutput">x</code>
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denotes a value of type <code class="computeroutput">X&</code>, <code class="computeroutput">x1</code> denotes values
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of type <code class="computeroutput">const X&</code>, <code class="computeroutput">pos</code> and <code class="computeroutput">n</code> denote
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values of type <code class="computeroutput">size_t</code>, and <code class="computeroutput">u</code> denotes an identifier.
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</p>
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<div class="table">
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<a name="boost_asio.reference.DynamicBuffer_v2.t0"></a><p class="title"><b>Table 10. 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">X::const_buffers_type</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">X::mutable_buffers_type</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">x1.size()</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">size_t</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">x1.max_size()</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">size_t</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">x1.capacity()</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">size_t</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">x1.data(pos, n)</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">X::const_buffers_type</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">u</code> that represents
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the underlying memory beginning at offset <code class="computeroutput">pos</code>, and
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where <code class="computeroutput">buffer_size(u) <= n</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">x.data(pos, n)</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">X::mutable_buffers_type</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">u</code> that represents
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the underlying memory beginning at offset <code class="computeroutput">pos</code>, and
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where <code class="computeroutput">buffer_size(u) <= n</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">x.grow(n)</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">size() + n <= max_size()</code>.<br> <br>
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Extends the underlying memory to accommodate <code class="computeroutput">n</code> additional
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bytes at the end. The dynamic buffer reallocates memory as required.
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All constant or mutable buffer sequences previously obtained using
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<code class="computeroutput">data()</code> are invalidated.<br> <br> Throws: <code class="computeroutput">length_error</code>
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if <code class="computeroutput">size() + n > max_size()</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">x.shrink(n)</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">n</code> bytes from the end of the underlying memory.
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If <code class="computeroutput">n</code> is greater than the size of the underlying memory,
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the entire underlying memory is emptied. All constant or mutable
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buffer sequences previously obtained using <code class="computeroutput">data()</code>
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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">x.consume(n)</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">n</code> bytes from the beginning of the underlying
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memory. If <code class="computeroutput">n</code> is greater than the size of the underlying
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memory, the entire underlying memory is emptied. All constant or
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mutable buffer sequences previously obtained using <code class="computeroutput">data()</code>
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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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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2021 Christopher
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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></td>
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</tr></table>
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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="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../boost_asio.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="Endpoint.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a>
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