Question

Suppose we have a class in C++

class X {
    int i;
public:
    X(int y): i(y) {}
};

X r(10);

int main() {
    return 0;
}

So we have an global object r.
My question is that when the constructor for global or static objects is been called, at compile-time or at runtime? Because the execution of the program starts at the main function.
And till then all the global objects should be intitialized.

Answer 1

Certainly not at compile time. It’s called at run-time, before main enters. All globals and statics (excluding method scoped statics) are initialized then.