thoseliterals

#include <iostream>
#include <string>
//#include <string_view>

constexpr long operator"" _KB(unsigned long long int value) { return value * 1024; }
long operator"" _MB(unsigned long long int value) { return value * 1024 * 1024; }
long operator"" _GB(unsigned long long int value) { return value * 1024 * 1024 * 1024; }

class A
{
public:
    A(std::string str) { std::cout << "A(string) called\n"; }
    //A(std::string_view str) { std::cout << "A(string_view) called\n"; }
    A(const char* str) { std::cout << "A(const char*) called\n"; }
};

int main(int argc, char** argv)
{
    //using namespace std::literals;
    using namespace std::string_literals;
    
    std::cout << "5 KB is " << 5_KB << " 7 MB is " << 7_MB << " 2 GB is " << 2_GB << "\n";
    A a("whats up\n");
    A b("whats up\n"s);
    //A c("whats up\n"sv);
    return 0;
}