Can someone explain this template code that gives me the size of an array? [duplicate]

Answer 1

A little weird way to get the result as compile-time const for those of us who don't have "constexpr":

#include 

namespace
{

    template 
    struct helper
    {
        enum
        {
            value = V
        };
    };


    template
    auto get_size(T(&)[Size]) -> helper < Size >
    {
        return helper < Size >() ;
    }

    template
    struct get_value
    {
        enum
        {
            value = T::value
        };
    };

}

int main()
{
    std::cout << get_value::value;
}