Re: Introspecting the current method
Re: Introspecting the current method
- Subject: Re: Introspecting the current method
- From: Greg Parker <email@hidden>
- Date: Mon, 19 Apr 2010 11:43:53 -0700
On Apr 19, 2010, at 7:09 AM, Michael Ash wrote:
> On Mon, Apr 19, 2010 at 3:27 AM, Jean-Daniel Dupas
> <email@hidden> wrote:
>>
>> Le 19 avr. 2010 à 04:21, Michael Ash a écrit :
>>> On Sun, Apr 18, 2010 at 10:15 PM, Dave DeLong <email@hidden> wrote:
>>>> Yes, code should obviously be written with this knowledge in mind. The use case I have for it is for macros. I like to use a debugging macro like the following to ensure that methods are getting called (without having to break execution to stop at a breakpoint):
>>>>
>>>> #define LogMethod NSLog(@"-[%@ %@]", NSStringFromClass([self class]), NSStringFromSelector(_cmd))
>>>>
>>>> This, of course, is only accurate for instance methods (since I'm logging a "-"). I was just wondering if there was a way I could use some sort of introspection to appropriately place a + or a -.
>>>>
>>>> I like the ([self class] == self) method, simply because it's shorter, but the [[self class] instancesRespondToSelector:_cmd] is also a great solution.
>>>
>>> The magic __func__ identifier produces a C string which I believe, in
>>> an ObjC method, has exactly the format you're looking for.
>>>
>>> Mike
>>
>> It is fine for most cases, but __func__ is defined at compile time, and so, does not log the real type of the instance (if this is a subclass).
>
> For me, if you're using this in a logging function, this is a feature,
> not a bug. If I'm logging a message like "X is Y, should be Z" then I
> want to know what code triggered that, and logging the actual object
> type is much less useful for that. If you're interested in the actual
> type as well, then I'd say just log that too, like:
>
> NSLog(@"%s:%d %@: %@", __func__, __LINE__, self, yourMessageGoesHere);
Alternatively, if you if you already know what you want to log and just can't decide between '-' and '+', then use __func__[0] for that.
--
Greg Parker email@hidden Runtime Wrangler
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