ldas-tools-al
2.6.5
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#include <fstream.hh>
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static int_type | _M_doit (basic_filebuf< _CharT, _Traits > *__this) |
underflow() may be called for one of two reasons. (1) We've been going through the special putback buffer, and we need to move back to the regular internal buffer. (2) We've exhausted the internal buffer, and we need to replentish it.
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There is a specialized version of underflow, for basic_filebuf<char>, in fstream.cxx.