ラムダ式で階乗を求めるやつ

Factorial.cpp

#include <functional>
#include <iostream>

using std::function;
using std::cout;

int main(void)
{
    function<int(int)> LambdaFactorial=[&](int n)->int{!n?1:n*LambdaFactorial(n-1);};
    cout<<LambdaFactorial(5);
    return 0;
}