not lisp

#include <iostream>
#include <functional>
#include <initializer_list>
#define args(x) initializer_list<x>

using namespace std;

function<int(args(int))> add = [](args(int) arg) -> int{
    int total = 0;
    for(int x : arg)
        total += x;
    return total;
};

int main() {
    cout << add({5,4,1,9});
    return 0;
}