#RXTraits

Traits are a tool for leveraging composition and interface inheritance to build a more flexible result than can be achieved with implementation inheritance alone. RXTraits applies them to instances on a case by case basis using dynamic subclassing:

@protocol Herbivore
-(void)eatPlants;
@end

@interface HerbivoreTrait : NSObject <RXTrait, Herbivore>
@end
@implementation HerbivoreTrait

+(Protocol *)traitProtocol {
	return @protocol(Herbivore);
}

-(void)eatPlants {
	// with gusto
}

@end

…

Lion<Herbivore> *omnivorousLion = RXTraitApply([HerbivoreTrait class], [Lion new]);
[omnivorousLion eatPlants];

Note that unlike RXConcreteProtocol, this doesn’t apply to the class as a whole; only the instances passed to RXTraitApply have the trait applied to them.

NB: You probably can’t use super in your trait methods. This probably isn’t that big a deal.