STL transform() demo

#include <iostream>#include <vector>#include <algorithm>using namespace std;int main(){    vector<int> ivec = { 1, 2, 3, 4 };    transform(ivec.begin(), ivec.end(), ivec.begin(),              [](int v){return v*v;});    for_each(ivec.begin(), ivec.end(), [](int v){cout << v << " ";});    return 0;}