std::basic_filebuf<CharT,Traits>::underflow
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< cpp | io | basic filebuf
| protected: virtual int_type underflow() |
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Reads more data into the input area.
Behaves like the base class std::basic_streambuf::underflow, except that to read the data from the associated character sequence (the file) into the get area, first reads the bytes from the file into a temporary buffer (allocated as large as necessary), then uses std::codecvt::in of the imbued locale to convert the external (typically, multibyte) representation to the internal form which is then used to populate the get area. The conversion may be skipped if the locale's std::codecvt::always_noconv returns true.
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