Can't initialize an enum with a value from its underlying type

Question

enum class Color { red, blue, green };
Color x = Color{5}; 

The second statement gives me error (main.cpp:20:23: error: cannot convert 'int' to 'Color' in initialization) . I was going through the c++ book it says it's OK to initialize the way in the second statement. I'm confused whether can we use int in initializing the enum type (Color here).

Answer 1

Initialization of scope enumerations with an integer without cast is a C++17 feature, see cppreference . You have to enable C++17 in your compile step.