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std::fflush(3) C++ Standard Libary std::fflush(3) NAME std::fflush - std::fflush Synopsis Defined in header <cstdio> int fflush( std::FILE* stream ); For output streams (and for update streams on which the last opera- tion was output), writes any unwritten data from the stream's buffer to the associated output device. For input streams (and for update streams on which the last opera- tion was input), the behavior is undefined. If stream is a null pointer, all open output streams are flushed, including the ones manipulated within library packages or otherwise not directly acces- sible to the program. Parameters stream - the file stream to write out Return value Returns zero on success. Otherwise EOF is returned and the error in- dicator of the file stream is set. Notes POSIX extends the specification of fflush by defining its effects on an input stream, as long as that stream represents a file or another seekable device: in that case the POSIX file pointer is repositioned to match the C stream pointer (which effectively undoes any read buffering) and the effects of any std::ungetc or std::ungetwc that weren't yet read back from the stream are dis- carded. Microsoft also extends the specification of fflush by defining its effects on an input stream: in Visual Studio 2013 and prior, it discarded the in- put buffer, in Visual Studio 2015 and newer, it has no effect, buffers are re- tained. See also fopen opens a file (function) fclose closes a file (function) http://cppreference.com 2022.07.31 std::fflush(3)
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