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#include <iostream>
#include <map>
class NoCopyClass
{
public:
NoCopyClass() {};
NoCopyClass(int value) {};
NoCopyClass& operator=(const NoCopyClass&) = delete;
};
int main()
{
std::map<int, NoCopyClass> my_map;
my_map[3] = NoCopyClass(20);
}