asio C++ library
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buffer_size (1 of 5 overloads)

Get the number of bytes in a modifiable buffer. 

std::size_t buffer_size(
    const mutable_buffer & b);
Copyright © 2003-2015 Christopher M. Kohlhoff

Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

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