#include #include using namespace std;class Data{public: Data(int val = 0) { mVal = val; } int getVal() const { return mVal; } void setVal(int val) {mVal = val; }protected: int mVal;};int main(int argc, char** argv){ map dataMap; dataMap[1] = Data(4); cout << "There are " << dataMap.count(1) << " elements with key 1\n"; dataMap.erase(1); cout << "There are " << dataMap.count(1) << " elements with key 1\n"; return (0);}