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Variadic function: Difference between revisions
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(varargs "Mary "had "a "little "lamb)
apply "varargs [Mary had a little lamb]
=={{header|Objective-C}}==
Objective-C uses the same varargs functionality as C. Like C, it has no way of knowing the number or types of the arguments. Often, varargs parameters will be of type <code>id</code> (object); and the convention is that, if the number of arguments is undetermined, then the list must be "terminated" with <code>nil</code>. Functions that follow this convention include the constructors of data structures that take an undetermined number of elements, like <code>[NSArray arrayWithObjects:...]</code>.
<lang objc>#include <stdarg.h>
void printAll(id firstObject, ...)
{
va_list args;
va_start(args, firstObject);
id obj;
for (obj = firstObject; obj != nil; obj = va_arg(args, id))
NSLog(@"%@", obj);
va_end(args);
}
// This function can be called with any number or type of objects, as long as you terminate it with <code>nil</code>:
printAll(@"Rosetta", @"Code", @"Is", @"Awseome!", nil);
printAll([NSNumber numberWithInt:4],
[NSNumber numberWithInt:3],
@"foo", nil);</lang>
=={{header|Perl}}==
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