Re: BOOL attribute types.
Re: BOOL attribute types.
- Subject: Re: BOOL attribute types.
- From: Akis Kesoglou <email@hidden>
- Date: Mon, 16 Feb 2015 23:27:58 +0200
> Yeah. Thanks.
>
> What I'm asking is how can I identify the property as a BOOL when analyzing property structures so that I can output "BOOL" to a descriptive string and if I analyze a char, I can output "char" as a descriptive string.
>
> Obviously, I can't use property_getAttributes() since it returns the same values for BOOL and char.
>
> What options are available here to detect that a property declared as a BOOL is a BOOL?
>
objc.h typedefs BOOL as char/bool, as David says, so I don’t think you can infer that a property is BOOL by introspecting the property — you’ll always see char or bool.
> Thanks.
>
> Sent from my iPad. Please pardon typos.
>
> On Feb 16, 2015, at 4:13 PM, David Duncan <email@hidden> wrote:
>
>>
>>> On Feb 16, 2015, at 1:06 PM, Alex Zavatone <email@hidden> wrote:
>>>
>>> Xcode 5.1.1
>>> IOS 7.x
>>>
>>> I'm messing with an auto description category for NSObjects with the interest of dumping out a class's properties in the format of property name, property class and string equivalent of property value.
>>>
>>> I'm also considering supporting scalar primitive types that are not NSObjects, such as CGRects, BOOLs and so on.
>>>
>>> In doing this, I'm checking the property's attributes with property_getAttributes().
>>>
>>> What is confusing here is that for properties that are declared as a non atomic BOOL, the attributes are Tc,N,V, where c codes for a char, according to the docs, according to the Runtime Property Attribute Description Examples.
>>>
>>> A char declared as a property returns exactly the same attributes as a BOOL with property_getAttributes().
>>>
>>> But for an NSString, property_getAttributes()returns "T@"NSString",&,N
>>>
>>> It's easy to detect the NSString properties, but why isn't BOOL included in a BOOL's property attributes? Is a BOOL just a char (that's what this is telling me)? What is going on under the hood here. How can I properly identify a BOOL and tell the difference between a BOOL and a char if they are represented the same way?
>>
>> On Mac OS X and 32-bit iOS targets, BOOL is a char, on 64-bit iOS targets its a C/C++ style ‘bool’.
>>
>>> Thanks much,
>>> Alex Zavatone.
>>>
>>> Sent from my iPad. Please pardon typos.
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>>
>> --
>> David Duncan
>>
>
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