enable_if example

gistfile1.cpp

#include <type_traits>
#include <stdio.h>
using namespace std;

template <typename T, typename Ty>
typename enable_if<sizeof(Ty)==sizeof(T), typename T>::type convertToType(Ty type)
{
    return *(T*)&type;
}

int main()
{
    int i = convertToType<int, float>(46843.0f);  // Valid
    int i = convertToType<int, double>(78615.0);  // Invalid
    printf("%i\n",i);
    return 0;
}