typedef枚举不起作用C ++

Question

I have a very basic question.

.h

private:
list <int> Stack;

typedef enum
{
    Push,
    Pop,
    Min,
    Display
}Operation;

Operation map(string s);

.Cpp:

Operation min_Stack::map(string s)
{

The compiler is not complaining for .h file but for .cpp its giving error : "identifier operation is unidentified".

I am unable to find what I did wrong here.

Answer 1

Instead of

Operation min_Stack::map(string s)

write

min_Stack::Operation min_Stack::map(string s)

The compiler searches the return type in the namespace scope and it did not find the name because the name is defined inside class min_Stack.