literal class type, C++ (vc++)

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//Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x64

#include <iostream>
#include <type_traits>

struct A
{
    constexpr A( unsigned long long x, int y ) : x(x), y(y) {}

A& zero()
    {
        std::cout << "zeroing object " << *this << " at address " << this << '\n' ;
        x = y = 0 ;
        return *this ;
    }

unsigned long long x ;
    int y ;

friend std::ostream& operator<< ( std::ostream& stm, const A& a )
    { return stm << "A{ " << a.x << ", " << a.y << " }" ; }
};

constexpr A operator"" _xy( unsigned long long xy )
{ return { xy/1000, int(xy%1000) } ; }

template < typename T > void print_stuff()
{
    std::cout << std::boolalpha
              << "object type? " << std::is_object<T>::value << '\n'

<< "scalar type? " << std::is_scalar<T>::value << '\n'

<< "literal type? "
              << std::is_literal_type<T>::value << "\n\n" ;
}

#define PRINT_STUFF(x) { std::cout << #x << '\n' ; print_stuff< decltype(x) >() ; }

int main()
{
    PRINT_STUFF(1234) ; // object type, scalar type, literal type

PRINT_STUFF(79552476868968_xy) ; // object type, non-scalar type, literal type

// modify an anonymous object of a literal type
    std::cout << 123456_xy .zero() << '\n' ; // zeroing object A{ 123, 456 } at address ...
                                             // A{ 0, 0 }
}

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Compilation time: 1,79 sec, absolute running time: 1,62 sec, absolute service time: 3,42 sec