You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

380 B

When a block captures weakSelf in the following pattern:

__weak __typeof(self) weakSelf = self;
  int (^my_block)() = ^() {
    __strong __typeof(weakSelf) strongSelf = weakSelf;
    int y = strongSelf->x;

the variable strongSelf should be checked for null before being used, otherwise this could cause a crash because the weak pointer weakSelf could be null.