Variable ' bop ' is uninitialized when captured by block

Code:

-(void) dotest {    * bop = [nsblockoperation blockoperationwithblock:^{        if (! bop.iscancelled) {            //  ...             // dosomething         }            }];        [Mqueue Addoperation:bop];}

This code is obviously problematic, if you use analyze to check, there will be a warning variable ' bop ' is the uninitialized when the captured by block.

In fact, the problem is the use of bop inside the block. When entering the block, bop is an uninitialized variable.

The workaround is simple, plus the __block modifier is a block variable.

-(void) dotest {    * bop = [nsblockoperation blockoperationwithblock:^{        if (! bop.iscancelled) {            //  ...             // dosomething         }            }];        [Mqueue Addoperation:bop];}

Variable ' bop ' is uninitialized when captured by block