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_stream::in_avail

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

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