replace_copy

#include <algorithm>
#include <iostream>
#include <vector>
                                                                                                                
using std::vector,
    std::replace_copy,
    std::cerr;
                                        
class Temp{
    public:
        int a, b;
        Temp(){};
        Temp(int i, int j):a(i), b(j){}
};

bool operator==(const Temp& l, const Temp& r)
{
    return l.a == r.a && l.b == r.b;
} 
                        
typedef vector<Temp> my_vector;
            
int main(){
    my_vector a = {Temp(8, 64), Temp(1, 1), Temp(1, 5), Temp(2, 4), Temp(3, 9), Temp(2, 4)};
    my_vector b;
    b.resize(a.size());

    auto print = [] (Temp t){
        cerr << "Temp(" << t.a << ", " << t.b << ")\n";
    }; 

    for_each(a.begin(), a.end(), print);
    cerr << "\n";

    my_vector::iterator i = replace_copy(a.begin(), a.end(), b.begin(), Temp(2, 4), Temp(7, 49));

    cerr << "b after replace_copy\n";
    for_each(b.begin(), b.end(), print);
    return 0;
}