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231 lines
16 KiB
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>read</title>
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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="boost_asio.reference.read"></a><a class="link" href="read.html" title="read">read</a>
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</h3></div></div></div>
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<p>
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<a class="indexterm" name="boost_asio.indexterm.read"></a>
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The <code class="computeroutput">read</code> function is a composed
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operation that reads a certain amount of data from a stream before returning.
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</p>
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<p>
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Attempt to read a certain amount of data from a stream before returning.
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</p>
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<pre class="programlisting">template<
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typename <a class="link" href="SyncReadStream.html" title="Buffer-oriented synchronous read stream requirements">SyncReadStream</a>,
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typename <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a>>
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std::size_t <a class="link" href="read/overload1.html" title="read (1 of 16 overloads)">read</a>(
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SyncReadStream & s,
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const MutableBufferSequence & buffers,
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typename constraint< is_mutable_buffer_sequence< MutableBufferSequence >::value >::type = 0);
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<span class="emphasis"><em>» <a class="link" href="read/overload1.html" title="read (1 of 16 overloads)">more...</a></em></span>
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template<
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typename <a class="link" href="SyncReadStream.html" title="Buffer-oriented synchronous read stream requirements">SyncReadStream</a>,
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typename <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a>>
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std::size_t <a class="link" href="read/overload2.html" title="read (2 of 16 overloads)">read</a>(
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SyncReadStream & s,
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const MutableBufferSequence & buffers,
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boost::system::error_code & ec,
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typename constraint< is_mutable_buffer_sequence< MutableBufferSequence >::value >::type = 0);
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<span class="emphasis"><em>» <a class="link" href="read/overload2.html" title="read (2 of 16 overloads)">more...</a></em></span>
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template<
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typename <a class="link" href="SyncReadStream.html" title="Buffer-oriented synchronous read stream requirements">SyncReadStream</a>,
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typename <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a>,
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typename <a class="link" href="CompletionCondition.html" title="Completion condition requirements">CompletionCondition</a>>
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std::size_t <a class="link" href="read/overload3.html" title="read (3 of 16 overloads)">read</a>(
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SyncReadStream & s,
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const MutableBufferSequence & buffers,
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CompletionCondition completion_condition,
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typename constraint< is_mutable_buffer_sequence< MutableBufferSequence >::value >::type = 0);
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<span class="emphasis"><em>» <a class="link" href="read/overload3.html" title="read (3 of 16 overloads)">more...</a></em></span>
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template<
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typename <a class="link" href="SyncReadStream.html" title="Buffer-oriented synchronous read stream requirements">SyncReadStream</a>,
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typename <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a>,
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typename <a class="link" href="CompletionCondition.html" title="Completion condition requirements">CompletionCondition</a>>
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std::size_t <a class="link" href="read/overload4.html" title="read (4 of 16 overloads)">read</a>(
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SyncReadStream & s,
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const MutableBufferSequence & buffers,
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CompletionCondition completion_condition,
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boost::system::error_code & ec,
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typename constraint< is_mutable_buffer_sequence< MutableBufferSequence >::value >::type = 0);
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<span class="emphasis"><em>» <a class="link" href="read/overload4.html" title="read (4 of 16 overloads)">more...</a></em></span>
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template<
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typename <a class="link" href="SyncReadStream.html" title="Buffer-oriented synchronous read stream requirements">SyncReadStream</a>,
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typename <a class="link" href="DynamicBuffer_v1.html" title="Dynamic buffer requirements (version 1)">DynamicBuffer_v1</a>>
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std::size_t <a class="link" href="read/overload5.html" title="read (5 of 16 overloads)">read</a>(
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SyncReadStream & s,
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DynamicBuffer_v1 && buffers,
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typename constraint< is_dynamic_buffer_v1< typename decay< DynamicBuffer_v1 >::type >::value >::type = 0,
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typename constraint< !is_dynamic_buffer_v2< typename decay< DynamicBuffer_v1 >::type >::value >::type = 0);
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<span class="emphasis"><em>» <a class="link" href="read/overload5.html" title="read (5 of 16 overloads)">more...</a></em></span>
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template<
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typename <a class="link" href="SyncReadStream.html" title="Buffer-oriented synchronous read stream requirements">SyncReadStream</a>,
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typename <a class="link" href="DynamicBuffer_v1.html" title="Dynamic buffer requirements (version 1)">DynamicBuffer_v1</a>>
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std::size_t <a class="link" href="read/overload6.html" title="read (6 of 16 overloads)">read</a>(
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SyncReadStream & s,
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DynamicBuffer_v1 && buffers,
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boost::system::error_code & ec,
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typename constraint< is_dynamic_buffer_v1< typename decay< DynamicBuffer_v1 >::type >::value >::type = 0,
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typename constraint< !is_dynamic_buffer_v2< typename decay< DynamicBuffer_v1 >::type >::value >::type = 0);
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<span class="emphasis"><em>» <a class="link" href="read/overload6.html" title="read (6 of 16 overloads)">more...</a></em></span>
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template<
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typename <a class="link" href="SyncReadStream.html" title="Buffer-oriented synchronous read stream requirements">SyncReadStream</a>,
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typename <a class="link" href="DynamicBuffer_v1.html" title="Dynamic buffer requirements (version 1)">DynamicBuffer_v1</a>,
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typename <a class="link" href="CompletionCondition.html" title="Completion condition requirements">CompletionCondition</a>>
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std::size_t <a class="link" href="read/overload7.html" title="read (7 of 16 overloads)">read</a>(
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SyncReadStream & s,
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DynamicBuffer_v1 && buffers,
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CompletionCondition completion_condition,
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typename constraint< is_dynamic_buffer_v1< typename decay< DynamicBuffer_v1 >::type >::value >::type = 0,
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typename constraint< !is_dynamic_buffer_v2< typename decay< DynamicBuffer_v1 >::type >::value >::type = 0);
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<span class="emphasis"><em>» <a class="link" href="read/overload7.html" title="read (7 of 16 overloads)">more...</a></em></span>
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template<
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typename <a class="link" href="SyncReadStream.html" title="Buffer-oriented synchronous read stream requirements">SyncReadStream</a>,
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typename <a class="link" href="DynamicBuffer_v1.html" title="Dynamic buffer requirements (version 1)">DynamicBuffer_v1</a>,
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typename <a class="link" href="CompletionCondition.html" title="Completion condition requirements">CompletionCondition</a>>
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std::size_t <a class="link" href="read/overload8.html" title="read (8 of 16 overloads)">read</a>(
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SyncReadStream & s,
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DynamicBuffer_v1 && buffers,
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CompletionCondition completion_condition,
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boost::system::error_code & ec,
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typename constraint< is_dynamic_buffer_v1< typename decay< DynamicBuffer_v1 >::type >::value >::type = 0,
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typename constraint< !is_dynamic_buffer_v2< typename decay< DynamicBuffer_v1 >::type >::value >::type = 0);
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<span class="emphasis"><em>» <a class="link" href="read/overload8.html" title="read (8 of 16 overloads)">more...</a></em></span>
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template<
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typename <a class="link" href="SyncReadStream.html" title="Buffer-oriented synchronous read stream requirements">SyncReadStream</a>,
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typename Allocator>
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std::size_t <a class="link" href="read/overload9.html" title="read (9 of 16 overloads)">read</a>(
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SyncReadStream & s,
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basic_streambuf< Allocator > & b);
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<span class="emphasis"><em>» <a class="link" href="read/overload9.html" title="read (9 of 16 overloads)">more...</a></em></span>
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template<
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typename <a class="link" href="SyncReadStream.html" title="Buffer-oriented synchronous read stream requirements">SyncReadStream</a>,
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typename Allocator>
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std::size_t <a class="link" href="read/overload10.html" title="read (10 of 16 overloads)">read</a>(
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SyncReadStream & s,
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basic_streambuf< Allocator > & b,
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boost::system::error_code & ec);
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<span class="emphasis"><em>» <a class="link" href="read/overload10.html" title="read (10 of 16 overloads)">more...</a></em></span>
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template<
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typename <a class="link" href="SyncReadStream.html" title="Buffer-oriented synchronous read stream requirements">SyncReadStream</a>,
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typename Allocator,
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typename <a class="link" href="CompletionCondition.html" title="Completion condition requirements">CompletionCondition</a>>
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std::size_t <a class="link" href="read/overload11.html" title="read (11 of 16 overloads)">read</a>(
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SyncReadStream & s,
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basic_streambuf< Allocator > & b,
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CompletionCondition completion_condition);
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<span class="emphasis"><em>» <a class="link" href="read/overload11.html" title="read (11 of 16 overloads)">more...</a></em></span>
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template<
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typename <a class="link" href="SyncReadStream.html" title="Buffer-oriented synchronous read stream requirements">SyncReadStream</a>,
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typename Allocator,
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typename <a class="link" href="CompletionCondition.html" title="Completion condition requirements">CompletionCondition</a>>
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std::size_t <a class="link" href="read/overload12.html" title="read (12 of 16 overloads)">read</a>(
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SyncReadStream & s,
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basic_streambuf< Allocator > & b,
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CompletionCondition completion_condition,
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boost::system::error_code & ec);
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<span class="emphasis"><em>» <a class="link" href="read/overload12.html" title="read (12 of 16 overloads)">more...</a></em></span>
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template<
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typename <a class="link" href="SyncReadStream.html" title="Buffer-oriented synchronous read stream requirements">SyncReadStream</a>,
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typename <a class="link" href="DynamicBuffer_v2.html" title="Dynamic buffer requirements (version 2)">DynamicBuffer_v2</a>>
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std::size_t <a class="link" href="read/overload13.html" title="read (13 of 16 overloads)">read</a>(
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SyncReadStream & s,
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DynamicBuffer_v2 buffers,
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typename constraint< is_dynamic_buffer_v2< DynamicBuffer_v2 >::value >::type = 0);
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<span class="emphasis"><em>» <a class="link" href="read/overload13.html" title="read (13 of 16 overloads)">more...</a></em></span>
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template<
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typename <a class="link" href="SyncReadStream.html" title="Buffer-oriented synchronous read stream requirements">SyncReadStream</a>,
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typename <a class="link" href="DynamicBuffer_v2.html" title="Dynamic buffer requirements (version 2)">DynamicBuffer_v2</a>>
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std::size_t <a class="link" href="read/overload14.html" title="read (14 of 16 overloads)">read</a>(
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SyncReadStream & s,
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DynamicBuffer_v2 buffers,
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boost::system::error_code & ec,
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typename constraint< is_dynamic_buffer_v2< DynamicBuffer_v2 >::value >::type = 0);
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<span class="emphasis"><em>» <a class="link" href="read/overload14.html" title="read (14 of 16 overloads)">more...</a></em></span>
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template<
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typename <a class="link" href="SyncReadStream.html" title="Buffer-oriented synchronous read stream requirements">SyncReadStream</a>,
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typename <a class="link" href="DynamicBuffer_v2.html" title="Dynamic buffer requirements (version 2)">DynamicBuffer_v2</a>,
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typename <a class="link" href="CompletionCondition.html" title="Completion condition requirements">CompletionCondition</a>>
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std::size_t <a class="link" href="read/overload15.html" title="read (15 of 16 overloads)">read</a>(
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SyncReadStream & s,
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DynamicBuffer_v2 buffers,
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CompletionCondition completion_condition,
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typename constraint< is_dynamic_buffer_v2< DynamicBuffer_v2 >::value >::type = 0);
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<span class="emphasis"><em>» <a class="link" href="read/overload15.html" title="read (15 of 16 overloads)">more...</a></em></span>
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template<
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typename <a class="link" href="SyncReadStream.html" title="Buffer-oriented synchronous read stream requirements">SyncReadStream</a>,
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typename <a class="link" href="DynamicBuffer_v2.html" title="Dynamic buffer requirements (version 2)">DynamicBuffer_v2</a>,
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typename <a class="link" href="CompletionCondition.html" title="Completion condition requirements">CompletionCondition</a>>
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std::size_t <a class="link" href="read/overload16.html" title="read (16 of 16 overloads)">read</a>(
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SyncReadStream & s,
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DynamicBuffer_v2 buffers,
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CompletionCondition completion_condition,
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boost::system::error_code & ec,
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typename constraint< is_dynamic_buffer_v2< DynamicBuffer_v2 >::value >::type = 0);
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<span class="emphasis"><em>» <a class="link" href="read/overload16.html" title="read (16 of 16 overloads)">more...</a></em></span>
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</pre>
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<h5>
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<a name="boost_asio.reference.read.h0"></a>
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<span class="phrase"><a name="boost_asio.reference.read.requirements"></a></span><a class="link" href="read.html#boost_asio.reference.read.requirements">Requirements</a>
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</h5>
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<p>
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<span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/read.hpp</code>
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</p>
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<p>
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<span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio.hpp</code>
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</p>
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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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