27.basic.ios.copyfmt.stdcxx-766.cpp

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#include <cassert>
#include <ios>
#include <iosfwd>
#include <locale>
#include <ostream>
 
 
int main ()
{
    struct sbuf : std::streambuf { } xsb, ysb;
    std::ostream xstrm (0);
    std::ostream ystrm (0);
 
    std::ios x (&xsb);
    std::ios y (&ysb);
 
    x.tie (&xstrm);
 
    const std::ios::iostate     x_rdstate = x.rdstate ();
    const std::streambuf* const x_rdbuf   = x.rdbuf ();
 
    const std::locale loc =
        std::locale (std::locale::classic (), new std::numpunct<char>());
 
    // set up y to be different from x
    y.tie (&ystrm);
    y.exceptions (y.eofbit);
    y.setf (y.boolalpha);
    y.precision (x.precision () + 1);
    y.width (x.width () + 1);
    y.fill (x.fill () + 1);
    y.imbue (loc);
 
    // verify test preconditions
    assert (x.tie ()    != y.tie ());
    assert (x.getloc () != y.getloc ());
 
    x.copyfmt (y);
 
    // verify copyfmt() postconditions
    assert (x.rdbuf ()      == x_rdbuf);
    assert (x.tie ()        == y.tie ());
    assert (x.rdstate ()    == x_rdstate);
    assert (x.exceptions () == y.exceptions ());
    assert (x.flags ()      == y.flags ());
    assert (x.precision ()  == y.precision ());
    assert (x.width ()      == y.width ());
    assert (x.fill ()       == y.fill ());
    assert (x.getloc ()     == y.getloc ());
}