#include <set>#include <iostream>#include "MyPrint.h"using namespace std;template<class T>class RuntimeCmp{public:enum cmp_mode{normal, reverse};private:cmp_mode mode;public:RuntimeCmp(cmp_mode m = normal) : mode(m){}bool operator() (const T& t1, const T& t2) const {return mode == normal ? t1 < t2 : t2 < t1;}bool operator== (const RuntimeCmp &rc){return mode == rc.mode;}};typedef set<int,RuntimeCmp<int>> IntSet;void fill (IntSet & set);int main(int argc, char * argv[]){IntSet coll1;fill(coll1);MyPrint(coll1, "coll1: ");RuntimeCmp<int> reverse_order(RuntimeCmp<int>::reverse);IntSet coll2(reverse_order);fill(coll2);MyPrint(coll2,"coll2: ");coll1 = coll2;coll1.insert(3);MyPrint(coll1, "coll1: ");if(coll1.value_comp() == coll2.value_comp()){cout << "coll1 and coll2 have same sorting criterion" << endl;}else cout << "coll1 and coll2 have different sorting criterion" << endl;system("pause");return 0;}void fill (IntSet& set){set.insert(4);set.insert(7);set.insert(5);set.insert(1);set.insert(6);set.insert(2);set.insert(5);}其中MyPrint函數就是個簡單打印函數，我想問在RuntimeCmp類中重寫的operator在后面的main中什么地方調用了，還有就是value_comp()這個函數的返回值是什么，請說的詳細點，謝謝。