What differences, if any, between C++03 and C++11 can be detected at run-time?

Question

It is possible to write a function, which, when compiled with a C compiler will return 0, and when compiled with a C++ compiler, will return 1 (the trivial sulution with

Answer 1

#include 

template void test(T t) { t.first = false; }

bool isCpp0x()
{
   bool b = true;
   test( std::make_pair(b, 0) );
   return b;
}