27.stringbuf.overflow.stdcxx-149.cpp

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#include <cassert>
#include <sstream>
 
int main ()
{
    // Exercise the implementation of the resolution of LWG issue 432:
    // http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#432
 
    struct MyBuf : std::stringbuf {
        using std::stringbuf::eback;
        using std::stringbuf::egptr;
        using std::stringbuf::pbase;
        using std::stringbuf::pptr;
        using std::stringbuf::epptr;
        using std::stringbuf::overflow;
    } buf;
 
    buf.overflow ('x');
 
    const int write_positions = int (buf.epptr () - buf.pbase ());
 
    const int pass = 1 < write_positions;
 
    assert (pass);
 
    return 1 - pass;
}