jai defer in C++ (as a macro)

defer.hpp

// creates a variable called "__defer + line number" this variable is destructed at the end of the scope.
// on destruction it calls a lambda function that was generated by the macro.

// example:
// This program outputs "x: 1"
/*
  {
    int x = 0;
    defer(printf("x: %d\n", x));
    x++;
  }
*/

#define defer(...) auto __defer##__LINE__ = lambda_defer([&](void){##__VA_ARGS__##;});

template <typename Callable>
struct Defer_Template {
    Callable func;
	
	Defer_Template(Callable f) : func(f) {}
	~Defer_Template() {
		func();
	}
};

template <typename Callable>
inline Defer_Template<Callable> lambda_defer(Callable f) {
	return Defer_Template<Callable>(f);
}