Fix __weak keywork position mistake. #102
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Based on Apple's doc: Transitioning to ARC Release Notes,
__weakis type qualifier. So, the correct position of__weakisType * __weak weakPtr, which is weakPtr is a weak pointer points to a variable with Type, instant of__weak Type * notWeakPtr, which is notWeakPtr is a pointer points to a weak variable with Type.Since
constis type qualifier too, replacing__weakbyconstis a easy way to verify it. The following is the example to show the difference:Type * const constPtrandconst Type * ptrToConstType.