class Simple{

private:
int m_nID;

public:
Simple(int nID) {m_nID = nID};
~Simple() {}

Simple(const Simple &other){ m_nID = other.m_nID; }
int getid(){return m_nID;}
};

int main ()
{
std::map<int,Simple> myMap;

Simple s1(1);
Simple s2(2);
myMap.insert(std::make_pair(1, s1));
myMap[2]=s2;// this doesn't work

return 0;
}