27.streambuf.imbue.stdcxx-307.cpp

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#include <cassert>
#include <locale>
#include <streambuf>
 
struct MyFacet: std::locale::facet
{
    static std::locale::id id;
};
 
std::locale::id MyFacet::id;
 
int main ()
{
    struct MyBuf: std::streambuf {
        void imbue (const std::locale &loc) {
            std::streambuf::imbue (loc);
        }
    } buf;
 
    const std::locale loc (buf.getloc (), new MyFacet);
 
    assert (_STD_HAS_FACET (MyFacet, loc));
    assert (!_STD_HAS_FACET (MyFacet, buf.getloc ()));
 
    buf.imbue (loc);
 
    assert (!_STD_HAS_FACET (MyFacet, buf.getloc ()));
 
    buf.pubimbue (loc);
 
    assert (_STD_HAS_FACET (MyFacet, buf.getloc ()));
 
    return 0;
}