asio C++ library
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buffered_write_stream::in_avail (1 of 2 overloads)

Determine the amount of data that may be read without blocking. 

std::size_t in_avail();
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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