C++ scoped object trick

gistfile1.cpp

#include <stdio.h>

class A {
public:
	A() { printf("A : begin\n"); }
	~A() { printf("A : end\n"); }
	operator bool() const { return true; }
};

#define SCOPED_OBJ() if(A a = A())

int main() {
	SCOPED_OBJ() {
		printf("in scope (1)\n");
	}
	return 0;
}