27.filebuf.close.stdcxx-969.cpp

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#include <cassert>
#include <fstream>
 
int main ()
{
    struct Filebuf : std::filebuf
    {
        char* pubgptr () const {
            return gptr ();
        }
 
        char* pubpptr () const {
            return pptr ();
        }
    };
 
    Filebuf fb;
    fb.open (__FILE__, std::ios::in);
 
    fb.sgetc ();
    fb.close ();
 
    // verify that get area is not active after close()
    assert (0 == fb.pubgptr ());
    // verify that put area is not active after close()
    assert (0 == fb.pubpptr ());
 
    // verify that calling pubsync() after close()
    // doesn't abort the program on MSVC 8.0 and later
    fb.pubsync ();
 
    return 0;
}