is there an equivalent to [[SomeClass new] autorelease] in objective-C

I know that I could implement as a category on NSObject, but is the开发者_运维知识库re an existing method for:

+(id)auto
{
    return [[self new]autorelease];
}

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Many classes provide convenience methods to do just that:

+ (id)string

is a method of NSString, for example.