main.cpp

#include <iostream>
enum class Color { RED, GREEN, BLUE };
Color redColor = Color::RED; // RED -> Color::RED
int num = ( int ) Color::GREEN; // RED -> ( int ) Color::RED
int main()
{
    if ( redColor == Color::GREEN ) { std::cout << "RED == GREEN"; } // false
    if ( num == (int) Color::GREEN ) { std::cout << "x=1 == GREEN"; } // true
}