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#### read (4 of 6 overloads)

Attempt to read a certain amount of data from a stream before returning.

    template<
        typename SyncReadStream,
        typename Allocator>
    std::size_t read(
        SyncReadStream & s,
        basic_streambuf< Allocator > & b);

This function is used to read a certain number of bytes of data from a stream. The call will block until one of the following conditions is true:

- An error occurred.

This operation is implemented in terms of one or more calls to the stream's read_some function.

###### Parameters

s

  The stream from which the data is to be read. The type must support the SyncReadStream concept.

b

  The basic_streambuf object into which the data will be read.

###### Return Value

The number of bytes transferred.

###### Exceptions

boost::system::system_error

  Thrown on failure.

###### Remarks

This overload is equivalent to calling:

    boost::asio::read(
        s, b,
        boost::asio::transfer_all());