27.filebuf.virtuals.stdcxx-522.cpp

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#include <cassert>
#include <fstream>
#include <ios>
 
int main ()
{
    struct MyBuf : std::filebuf {
        int_type overflow (int_type c) {
            return std::filebuf::overflow (c);
        }
    } buf;
 
    buf.open ("file", std::ios::out);
    buf.pubsetbuf (0, 0);
    buf.overflow (std::filebuf::traits_type::eof ());
    buf.close ();
 
    std::ifstream in ("file");
    assert (std::istream::traits_type::eof () == in.get ());
}