Start an asynchronous receive on a connected socket.

template<
    typename MutableBufferSequence,
    typename ReadHandler>
void async_receive(
    const MutableBufferSequence & buffers,
    ReadHandler handler);
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template<
    typename MutableBufferSequence,
    typename ReadHandler>
void async_receive(
    const MutableBufferSequence & buffers,
    socket_base::message_flags flags,
    ReadHandler handler);
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