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#include <iostream>
using namespace std;
 
class MainMenu {
public:
    MainMenu(const MainMenu& other) = delete;
    MainMenu& operator=(const MainMenu& other) = delete;
    static MainMenu& GetInstance() { return _instance; }
 
private:
    static MainMenu _instance;
 
    MainMenu() { cout << __PRETTY_FUNCTION__ << endl;}
};
 
// HERE HERE HERE!!
MainMenu MainMenu::_instance = MainMenu(); // Or just MainMenu MainMenu::_instance;
 
int main() {
    MainMenu::GetInstance();
    return 0;
}

prog.cpp:17:41: error: use of deleted function ‘MainMenu::MainMenu(const MainMenu&)’
 MainMenu MainMenu::_instance = MainMenu(); // Or just MainMenu MainMenu::_instance;
                                         ^
prog.cpp:6:5: note: declared here
     MainMenu(const MainMenu& other) = delete;
     ^~~~~~~~

Standard output is empty