Question

I have a class whose private member is a static map:

Class Devices
{   
    ...
    private:
    struct DevicePair
    {
       int nCtr;
       bool isToAdd;
    };
    DevicePair m_DevPair;
    static map <string, DevicePair> m_SYSdeviceMap;    
};

Why can’t I just do this in the cpp file?

map <string, DevicePair> Devices::m_SYSdeviceMap;

How do I initialize this in the cpp file?

Answer 1

With this line:

map<string, Devices::DevicePair> Devices::m_SYSdeviceMap;

Also, as a good coding practice, remove the using namespace std; from your header, and qualify your use of map – std::map.