lambdas.cpp

// lambda syntax; construction & call
int x = 0;
int y = 10;
[x, &y] (int z) { return x + (++y) + (++z); } (5);

// desugared
struct __lambda1 {
  int x;
  int &y;
  
  constexpr __lambda1(int _x, int &_y) : x(_x), y(_y) { }
  
  decltype(auto) operator() (int z) const {
    return x + (++y) + (++z);
  }
};
// construction & call
int x = 0;
int y = 10;
__lambda1(x, y)(5);