iterators.cpp

#include <iostream>
#include <iterator>
#include <vector>
#include <algorithm>
#include <functional>

using namespace std;

template<typename It, typename OutIt>
OutIt printContainer(It begin, It end, OutIt ot) {
    for(auto it=begin; it != end; ++it) {
        *ot++ = *it;
    }
    return ot;    
}

template<typename It, typename OutIt, typename Func>
OutIt printContainer(It begin, It end, OutIt ot, Func F) {
    for(auto it=begin; it != end; ++it) {
        if (F(*it)) {
            *ot++ = *it;
        }
    }
    return ot;    
}

int main() {
    vector<int> v { 1, 4, 5, 19, 2 };    
    printContainer(v.begin(), v.end(), ostream_iterator<int>(cout, " "), [](auto x) {
                if(x % 2 == 0) {
                    return true;
                }
                return false;
            });
    return 0;
}