Strict Type Checking in Objective-C Part 2

Question

In this question I was looking for a way to ensure that a variable is of a certain type using a define. But sometimes I have this situation:

- (void) theSitu         


        

Answer 1

When you get the arguments of a method (using method_copyArgumentType as mentioned in the other answer), the "type" it returns is either a C type (like int, float, etc) or just Object (returned as a "@"). Sadly it's not possible to get the objective-C type that a method is expecting — that information is lost when you compile.

Answer to a similar problem found here.

Answer 2

Hmm... Interesting question. I have a few things that should work (theoratically).

You can get the function name that is being executed using __func__. (See this).

You can get the Selector from a string:

SEL selector = selectorFromString(@"doWork");

You can get Method object of an instance of a class using objective C runtime.

Method *m = class_getInstanceMethod(self, selector);

You can get number of arguments of a method from:

method_getNumberOfArguments

you can get argument type using

method_copyArgumentType

And from here you should be able to assert.

I know, long shot - I have not tried to run the code. I'll update the answer if I get on a Mac soon.