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in Technique[技术] by (71.8m points)

C++ How can I access to an inner enum class?

I am facing a problem in c++:

#include <iostream>
 class Apple{
public:
    int price = 100;
    enum class color {
    red =1, green, yellow
    };



};
int main() {
 Apple apple;
 std::cout << Apple::color::green << std::endl;

}

When I try to compile this code following message appears:

[Error] 'Apple::color' is not a class or namespace

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0 votes
by (71.8m points)
  1. Looks like you're using a pre C++11 compiler or c++11 flag is not enabled.
  2. After using correct c++11 flag, you will have to overload operator <<

    friend std::ostream& operator <<( std::ostream& os, const color& c )
    {
      /* ... */
      return os;
    }
    

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