Array decay to pointers in templates

Question

Please consider this code:

#include 

template
void f(T x) {
    std::cout << sizeof(T) << \'\\n\';
}

int main         


        

Answer 1

You can also use templates like the following:

template 
inline std::size_t number_of_elements(T (&ary)[N]) {
    return N;
}

This little trick will cause compile errors if the function is used on a non-array type.