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

From this question:

struct T
{
    bool flag;
    T() : flag(false) {}
    T(const T&) : flag(true) {}
};

std::vector test(1);
bool is_cpp0x = !test[0].flag;