Parametric polymorphism: Difference between revisions

=={{header|Objective-C}}==

{{trans|C++}}

{{works with|Xcode|7}}

<lang objc>@interface Tree<T> : NSObject {

T value;

Tree<T> *left;

Tree<T> *right;

}

- (void)replaceAll:(T)v;

@end

@implementation Tree

- (void)replaceAll:(id)v {

value = v;

[left replaceAll:v];

[right replaceAll:v];

}

@end</lang>

Note that the generic type variable is only used in the declaration, but not in the implementation.