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Get a list of buffers that represents the output sequence, with the given size.
mutable_buffers_type prepare( std::size_t n);
Ensures that the output sequence can accommodate n
characters, reallocating character array objects as necessary.
An object of type mutable_buffers_type
that satisfies MutableBufferSequence requirements, representing character
array objects at the start of the output sequence such that the sum of
the buffer sizes is n.
If size()
+ n
> max_size().
The returned object is invalidated by any basic_streambuf
member function that modifies the input sequence or output sequence.