// functional_mem_fun.cpp// compile with: /EHsc#include <vector>#include <functional>#include <algorithm>#include <iostream>#include <ext/functional>using namespace std;class StoreVals   {    int val;public:    StoreVals() { val = 0; }    StoreVals(int j) { val = j; }    bool display() { cout << val << " "; return true; }    int squareval() { val *= val; return val; }    int lessconst(int k) {val -= k; return val; }};int main( ){    vector<StoreVals *> v1;    StoreVals sv1(5);    v1.push_back(&sv1);    StoreVals sv2(10);    v1.push_back(&sv2);    StoreVals sv3(15);    v1.push_back(&sv3);    StoreVals sv4(20);    v1.push_back(&sv4);    StoreVals sv5(25);    v1.push_back(&sv5);    cout << "The original values stored are: " ;    for_each(v1.begin(), v1.end(), mem_fun<bool, StoreVals>(&StoreVals::display));    cout << endl;    // Use of mem_fun calling member function through a pointer    // square each value in the vector using squareval ()    for_each(v1.begin(), v1.end(), mem_fun<int, StoreVals>(&StoreVals::squareval));       cout << "The squared values are: " ;    for_each(v1.begin(), v1.end(), mem_fun<bool, StoreVals>(&StoreVals::display));    cout << endl;    // Use of mem_fun1 calling member function through a pointer    // subtract 5 from each value in the vector using lessconst ()    for_each(v1.begin(), v1.end(),         bind2nd (__gnu_cxx::mem_fun1<int, StoreVals,int>(&StoreVals::lessconst), 5));       cout << "The squared values less 5 are: " ;    for_each(v1.begin(), v1.end(), mem_fun<bool, StoreVals>(&StoreVals::display));    cout << endl;}