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c++c++23

How to flush a stream in C++23 when using std::print or std::println?

I am using the new C++23 std::print function from the <print> utility.

My understanding is that the C++ standard does not define whether or not std::print and std::println should flush the stream after writing to it.

If I wanted to flush the stream (stdout or stderr), what is the most appropriate solution in C++ 23?

Solution

  • Use one of

    std::flush

    which flushes a std::basic_ostream

    or

    std::fflush

    which operates on a FILE*.

    Detailed references can be found below