list-front

////////////////////////////////////////
//      2018/04/25 21:39:52
//      list-front

// return the first element
#include <iostream>
#include <list>

using namespace std;

template<class T>
void print(list<T> l){
    list<T>::iterator it = l.begin();
    while (it != l.end()){
        cout << *(it++) << " ";
    }
    cout << endl;
}

int main(){
    int ary[] = { 1, 2, 3, 4, 5 };
    list<int> li;

    for (int i = 0; i < 5; i++){
        li.push_front(ary[i]);
        cout << "front:" << li.front() << endl;
        print<int>(li);
    }
    return 0;
}

/*
OUTPUT:
    front:1
    1
    front:2
    2 1
    front:3
    3 2 1
    front:4
    4 3 2 1
    front:5
    5 4 3 2 1
*/