Many good features were added to C++11 to simplify the metaprogramming. One such feature is the alternative function syntax. It allows deducing the result type of a template function. Here is an example:

template <class T1, class T2>
auto my_function_cpp11(const T1& v1, const T2& v2)
    -> decltype(v1 + v2)
{
    return v1 + v2;
}

It allows us to write generic functions more easily:

#include <cassert>

struct s1 {};
struct s2 {};
struct s3 {};

inline s3 operator + (const s1& /*v1*/, const s2& /*v2*/) {
    return s3();
}

inline s3 operator + (const s2& /*v1*/, const s1& /*v2*/) {
    return s3();
}
 
int main() {
    s1 v1;
    s2 v2;

    s3 res0 = my_function_cpp11(v1, v2);
    assert(my_function_cpp11('\0', 1) == 1);
}

But, Boost has a lot of functions like these and it does not require C++11 to...