Question

I am new to C++ and experimenting with using pointers to return a values. I have written up a simple program, but I cannot understand why it crashes.

main.cpp

int main() {
    bool *pMyBool;

    bar myBar;
    myBar.foo(pMyBool);

    cout << *pMyBool << endl;

    return 0;
}

bar.cpp

int bar::foo(bool *pMyBool) {
    bool myBool = true;
    *pMyBool = myBool;
    return 0;
}

output

1
//then it crashes

Answer 1

In C++, you don’t want to use pointers in your case, but to use references:

int bar::foo(bool &MyBool) {
   MyBool = true;
   return 0;
}

Of course, you’ll just call from your main

   bool MyMainBool = false;
   bar.foo(MyMainBool);