Example of custom literal suffixes in c++11

suffixes

#include <cstdio>

struct _Ms { int x; };
struct _Us { int x; };

constexpr _Ms operator "" ms(long long unsigned x) { return {(int)x}; }
constexpr _Us operator"" us(long long unsigned x) { return {(int)x}; }

void fun(_Ms x) { printf("%d milisekund\n", x.x); }
void fun(_Us x) { printf("%d mikrosekund\n", x.x); }

int main() {
	fun(5ms);
	fun(500us);
	
	return {};
}