...one of the most highly
regarded and expertly designed C++ library projects in the
world. — Herb Sutter and Andrei
Create a new modifiable buffer from an existing buffer.
mutable_buffer buffer( const mutable_buffer & b, std::size_t max_size_in_bytes);
value equivalent to:
mutable_buffer( b.data(), min(b.size(), max_size_in_bytes));