I just started to learn c++ and i have the following problem in this simple code:
enum class color_type {green,red,black};
color_type color(color_type::red);
I get the error "color_type is not a class or namespace". My goal is to create a variable of type color_type that can only take values red, black and green. Could you please help me? Thank you
Your code looks like valid c++11 to me.
If your compiler does not support c++11 then you simulate an enum class with a namespace or struct like so
struct colour_type
{
enum value
{
red,
green,
blue
}
}
//usage is like so
colour_type::value myColour = colour_type::red;
It's not perfect but it keeps the enum in its own scope.
It seems that your compiler does not support qualified names of unscoped enumerators (I mean your post before its edition when there was shown an unscoped enumeration). Write simply
enum color_type {green,red,back};
color_type color(red);
Or you could use a scoped enumeration as for example
enum class color_type {green,red,back};
color_type color(color_type::red);
In fact these declarations
enum color_type {green,red,back};
color_type color(color_type::red);
are correct according to the current C++ Standard.
enum class's scope, is not it? It does not compile also on g++ 4.9.2 with c++11 so you may be wrong and I am right :)