-isKindOfClass Macro Shortcut

gistfile1.m

  		
    #define EXPECT(anObj, aClass)\
    aClass * anObj##_valid = nil;\
    BOOL anObj##_isClass = [anObj isKindOfClass:[aClass class]];\
    if (! anObj##_isClass) { NSLog(@"Warning: Invalid class, '%s' is %@, expecting %@", #anObj, [anObj class], [aClass class]); }\
    if ( anObj##_isClass )\
    { anObj##_valid = (aClass *) anObj; }\
    if ( anObj##_isClass )
		
	// ...replaces this:
		
	id webServiceResponse;
	if ([webServiceResponse isKindOfClass:[NSDictionary class]])
	{
		NSDictionary *typeCast = (NSDictionary *)webServiceResponse;
		[typeCast dictionarySpecificMethod];
	}
	else
	{
		NSLog(@"Warning: expecting dictionary");
	}
		
	// ...with this:
		
	EXPECT(webServiceResponse, NSDictionary)
	{
		[webServiceResponse_valid dictionarySpecificMethod];
	}