Re: pointers in objective-c?
Re: pointers in objective-c?
- Subject: Re: pointers in objective-c?
- From: "Clark S. Cox III" <email@hidden>
- Date: Fri, 01 Aug 2008 12:24:10 -0700
On Aug 1, 2008, at 12:10 PM, Glenn English wrote:
Wayne Shao wrote:
It seems that every object is a pointer in the sample code I have
seen. Is there any distinction between an object and its pointer?
In C++, C* c; would be an uninitialized pointer. But the following
line will creates an object with the constructor C().
C c;
It seems that there is no such equivalent syntax in Objective-C.
objects are created either from factory pattern or [[A alloc]
someInitMethod ....];
so, is it possible to write?
NSString a;
NSNumber b;
Sure. And it'll even compile. But you'd better not try to do much
with them:-)
No, it won't compile:
[ccox@clarkco:~]% cat test.m
#import <Cocoa/Cocoa.h>
int main()
{
NSString s;
return 0;
}
[ccox@clarkco:~]% cc test.m
test.m: In function ‘main’:
test.m:5: error: statically allocated instance of Objective-C class
‘NSString’
--
Clark S. Cox III
email@hidden
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