Re: Variadic arguments to methods in Objective-C - How ?
Re: Variadic arguments to methods in Objective-C - How ?
- Subject: Re: Variadic arguments to methods in Objective-C - How ?
- From: Evan Schoenberg <email@hidden>
- Date: Sat, 8 Jan 2005 14:19:55 -0600
Vincent,
Below is an example method which takes a variable number of arguments; it's a glorified printf, really. Hope it helps.
- (void)adiumDebug:(NSString *)message, ...
{
va_list ap; /* Points to each unamed argument in turn */
NSString *actualMessage;
va_start(ap, message); /* Make ap point to the first unnamed argument */
actualMessage = [[NSString alloc] initWithFormat:message
arguments:ap];
/* Do something with actual message */
/* clean up when done */
[actualMessage release];
va_end(ap);
}
-Evan
www.adiumx.com
On Jan 8, 2005, at 2:13 PM, Vincent Coetzee wrote:
I am sorry to disagree, but I must, Objective-C must allow variadic arguments, because many of the Foundation classes uses them such as NSArray, for example
[NSArray arrayWithObjects: obj1,obj2,etc,nil]
also
[NSString stringWithFormat: string,arg1,...argn]
Vincent
On Jan 08, 2005, at 22:04, Tommy Nordgren wrote:
Jan 8, 2005 kl. 8:38 PM skrev Vincent Coetzee:
Dear List,
How does one create methods in Objective-C that use a variable number of arguments. I am familiar with the normal C mechanism, but does this work in Objective-C considering the hidden arguments to methods (i.e. _self and _cmd) ? So can I use the normal C mechanism and if not how is it done ? Some sample code would be appreciated.
As far as I know, the objective C syntax don't allow variadic methods. However,
by giving the source files the suffix .mm, you can use C++ as well to a certain extent, although it is tricky, and according to the documentation not possible to embed c++ objects with virtual methods directly in Objective C classes. You can hovever use pointers to refer to objective c classes from c++ code and vice versa.
Also, it IS possible to embed most C++ classes in Objective C, althought it can be tricky because there is no built in language support for this.
Hope this helps.
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