Alternative to Objective-C objects in structs (ARC)

问题

I have the following code here that won't run on ARC since it combines Objective-C objects in structs:

struct SingleToManyRelation {
    id singleObject;
    NSSet* manyObjects;
}

I know this is reminiscent of Core Data, but that's not the point ;) I am just looking for a solution to implement something like that without having to create a "container" class.

Thanks in advance for your advices, Christian

回答1:

Give your objects the __unsafe_unretained attribute and ARC will stop complaining (but keep in mind that they aren't retained! So you have to somehow store a strong relationship to them, if you don't want to lose them)

来源：https://stackoverflow.com/questions/10055404/alternative-to-objective-c-objects-in-structs-arc