You've answered 0 of 177 questions correctly. (Clear)

Question #242 Difficulty: 2

According to the C++23 standard, what is the output of this program? 

    #include <iostream>
#include <type_traits>
#include <utility>

void g(int&) { std::cout << 'L'; }
void g(int&&) { std::cout << 'R'; }

template<typename T>
void f(T&& t) {
    if (std::is_same_v<T, int>) { std::cout << 1; }
    if (std::is_same_v<T, int&>) { std::cout << 2; }
    if (std::is_same_v<T, int&&>) { std::cout << 3; }
    g(std::forward<T>(t));
}

int main() {
    f(42);
    int i = 0;
    f(i);
}

Answer:

Problems? View a hint or try another question.

I give up, show me the answer (make 3 more attempts first).

Mode : Training

You are currently in training mode, answering random questions. Why not Start a new quiz? Then you can boast about your score, and invite your friends.

Contribute

Create your own!

Android app

Get Sergey Vasilchenko's CppQuiz Android app.

C++ Brain Teasers

Get the book, support the site! C++ Brain Teasers cover