Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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buffered_write_stream::in_avail (2 of 2 overloads)

buffered_write_stream::in_avail (2 of 2 overloads)

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

std::size_t in_avail(
    boost::system::error_code & ec);