Question

For instance:

template <typename Type1, typename Type2>
void fun(const Type1 &v1, const Type2 &v2)
{
    largest<Type1, Type2>::type val = v1 + v2;
    .
    .
    .
};

I’d like to know if there’s a “largest” somewhere, perhaps in boost.

Answer 1

template<bool, typename T1, typename T2>
struct is_cond {
    typedef T1 type;
};

template<typename T1, typename T2>
struct is_cond<false, T1, T2> {
    typedef T2 type;
};

template<typename T1, typename T2>
struct largest {
     typedef typename is_cond< (sizeof(T1)>sizeof(T2)), T1, T2>::type type;
};