#include "helper.h"
#include <list>
using namespace std;
int main(int argc, const char * argv[]) {

    //switch between list and vector
    list<int> a = {0, 1};
    list<char> b = {'a', 'b'};

    func(a, b);

    return 0;
}

template <class C1, class C2>
void func(C1 &a, C2 &b)

#include <list>

template <class C1, class C2>
void func (C1 &a, C2 &b)
{
    //do stuff
}