LAB1 / Исходники / 2.07.decltype_changkunmodern-cpp-tutorial_GNAQ

//
// 2.7.decltype.cpp
// chapter 2 language usability
// modern cpp tutorial
//
// created by changkun at changkun.de
// https://github.com/changkun/modern-cpp-tutorial
//

#include <iostream>
#include <type_traits>

int main() {
    auto x = 1;
    auto y = 2;
    decltype(x+y) z = 3;
    if (std::is_same<decltype(x), int>::value)
        std::cout << "type x == int" << std::endl;
    if (std::is_same<decltype(x), float>::value)
        std::cout << "type z == float" << std::endl;
    if (std::is_same<decltype(x), decltype(z)>::value)
        std::cout << "type z == type x" << std::endl;
    return 0;
}