### async_read

The `async_read` function is a composed asynchronous operation that reads a certain amount of data from a stream before completion.

Start an asynchronous operation to read a certain amount of data from a stream.

    template<
        typename AsyncReadStream,
        typename MutableBufferSequence,
        typename ReadHandler>
    DEDUCED async_read(
        AsyncReadStream & s,
        const MutableBufferSequence & buffers,
        ReadHandler && handler,
        typename enable_if< is_mutable_buffer_sequence< MutableBufferSequence >::value >::type *  = 0);
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    template<
        typename AsyncReadStream,
        typename MutableBufferSequence,
        typename CompletionCondition,
        typename ReadHandler>
    DEDUCED async_read(
        AsyncReadStream & s,
        const MutableBufferSequence & buffers,
        CompletionCondition completion_condition,
        ReadHandler && handler,
        typename enable_if< is_mutable_buffer_sequence< MutableBufferSequence >::value >::type *  = 0);
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    template<
        typename AsyncReadStream,
        typename DynamicBuffer,
        typename ReadHandler>
    DEDUCED async_read(
        AsyncReadStream & s,
        DynamicBuffer && buffers,
        ReadHandler && handler,
        typename enable_if< is_dynamic_buffer< typename decay< DynamicBuffer >::type >::value >::type *  = 0);
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    template<
        typename AsyncReadStream,
        typename DynamicBuffer,
        typename CompletionCondition,
        typename ReadHandler>
    DEDUCED async_read(
        AsyncReadStream & s,
        DynamicBuffer && buffers,
        CompletionCondition completion_condition,
        ReadHandler && handler,
        typename enable_if< is_dynamic_buffer< typename decay< DynamicBuffer >::type >::value >::type *  = 0);
      » more...

    template<
        typename AsyncReadStream,
        typename Allocator,
        typename ReadHandler>
    DEDUCED async_read(
        AsyncReadStream & s,
        basic_streambuf< Allocator > & b,
        ReadHandler && handler);
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    template<
        typename AsyncReadStream,
        typename Allocator,
        typename CompletionCondition,
        typename ReadHandler>
    DEDUCED async_read(
        AsyncReadStream & s,
        basic_streambuf< Allocator > & b,
        CompletionCondition completion_condition,
        ReadHandler && handler);
      » more...

##### Requirements

Header: `asio/read.hpp`

Convenience header: `asio.hpp`