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#### basic_streambuf::underflow

Override std::streambuf behaviour.

    int_type underflow();

Behaves according to the specification of `std::streambuf::underflow()`.

| Copyright © 2003-2020 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)