for_each

#include <algorithm>
#include <iostream>
#include <vector>
                                                                                                                
using std::vector,
    std::cerr;
                                        
class Temp{
    public:
        int a, b;
        Temp(int i, int j):a(i), b(j){}
};
                        
typedef vector<Temp> my_vector;
            
int main(){
    my_vector a = { Temp(2, 4), Temp(3, 9), Temp(4, 16), Temp(5, 25)};
    auto inc = [](Temp &t){
        t.a +=1;
        t.b *=2;
    };

    auto print = [](Temp t){
        cerr << "Temp(" << t.a << ", " << t.b << ")\n";
    };
    cerr << "before inc:\n";
    for_each(a.begin(), a.end(), print);
    for_each(a.begin(), a.end(), inc);
    cerr << "after inc:\n";
    for_each(a.begin(), a.end(), print);
    return 0;
}