#include <iostream>
#include <functional>

std::function<int(int)> makeLambda1(int x) {
  return [x] (int y) { return x * y; };
}

auto makeLambda2(int x) {
  return [x] (int y) { return x * y; };
}

auto makeLambda3() {
  return [] (int y) { return 10 * y; };
}

int main() {
  auto lambda1 = makeLambda1(10);
  auto lambda2 = makeLambda2(10);
  auto lambda3 = makeLambda3();
  std::cout << sizeof(lambda1) << " ";
  std::cout << sizeof(lambda2) << " ";
  std::cout << sizeof(lambda3) << " ";
  std::cout << sizeof(int(*)(int)) << std::endl;
}