C++在全局范围内是否有代码?

Ch programming language (C/C++)的解释器,不能在C++程序的全局范围内拥有代码。代码/指令只能在函数体[期间]内!

但是,我发现,C++中的主函数之前,可以将函数赋值给全局变量!这将涉及 call 汇编代码中的指令。也可以将两个变量的和赋给程序集代码外的另一个全局变量。几乎可以肯定的是 add 和 mov + 如果类类型的重载运算符中包含print语句,则该运算符何时执行?

这个问题是对我之前发布的一个问题的回应: Why can't I assign values to global variables outside a function in C?

int foo() {
    cout << "Inside foo()" << endl;
    return 5;
}

// is this not code?
int global_variable = foo();

// How does this statement work without generating code?
int a = 4;
int b = 5;
int c = a + b;

int main() {
    // The program behaves as if the statements above were executed from
    // top to bottom before entering the main() function.
    cout << "Inside main()" << endl;
    cout << "int c = " << c << endl;
    return 0;
}