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Static member function means that we can be called directly by using the class name and the scope operator.
for example :
class IDGenerator{private: static int s_nNextID;public: static int GetNextID() { return s_nNextID++; }};// We'll start generating IDs at 1int IDGenerator::s_nNextID = 1;int main(){ for (int i=0; i < 5; i++) cout << "The next ID is: " << IDGenerator::GetNextID() << endl; return 0;}ref : http://www.learncpp.com/cpp-tutorial/812-static-member-functions/
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