匿名再帰

anonymous_recursion.cc

#include <iostream>
#include <functional>

using namespace std;

int main()
{
  function<int(int)> fac = [&] (int n)
  {
    if (n == 1)
      return 1;
    else
      return n * fac(n-1);
  };

  cout << fac(5) << endl;
}