Read some message data.

template<
    class DynamicBuffer>
std::size_t
read_some(
    DynamicBuffer& buffer,
    std::size_t limit);
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template<
    class DynamicBuffer>
std::size_t
read_some(
    DynamicBuffer& buffer,
    std::size_t limit,
    error_code& ec);
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template<
    class MutableBufferSequence>
std::size_t
read_some(
    MutableBufferSequence const& buffers);
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template<
    class MutableBufferSequence>
std::size_t
read_some(
    MutableBufferSequence const& buffers,
    error_code& ec);
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