GoLang's defer in C++

defer.hpp

template<typename Func>
class imp_defer_obj {
public:
	imp_defer_obj(Func f) : FinalActionFunc(f) {}
	~imp_defer_obj() {
		FinalActionFunc();
	}
private:
	Func FinalActionFunc;
};

template <typename F>
static inline imp_defer_obj<F> imp_defer(F f) {
	return imp_defer_obj<F>(f);
}

#define PP_CAT(a, b) PP_CAT_I(a, b)
#define PP_CAT_I(a, b) PP_CAT_II(~, a ## b)
#define PP_CAT_II(p, res) res
#define UNIQUE_NAME(base) PP_CAT(base, __COUNTER__)

#define defer(x) auto UNIQUE_NAME(finally_obj) = imp_defer([&]() { \
      x;\
})


/*
Example:
#include "defer.hpp"
int main() {
    
        char* tmp = new char[256];
        defer(if(tmp != nullptr) { 
            delete[] tmp; 
        });
}
*/