#include <map>
#include <iostream>
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<int, Data> 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);
}
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