You've answered 0 of 175 questions correctly. (Clear)

Question #208 Difficulty: 1

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

    #include <iostream>
#include <map>

bool default_constructed = false;
bool constructed = false;
bool assigned = false;

class C {
public:
    C() { default_constructed = true; }
    C(int) { constructed = true; }
    C& operator=(const C&) { assigned = true; return *this;}
};

int main() {
    std::map<int, C> m;
    m[7] = C(1);

    std::cout << default_constructed << constructed << assigned;
}

Hint:

What does the [] operator do if the key is not present?

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