C SCNetworkReachabilityContext ARC conversion

2018-06-15 20:00:33

While converting an app to use Automatic Reference Counting I came across this error:

SCNetworkReachabilityContext context = {0, self, NULL, NULL, NULL};

Implicit conversion of an Objective-C pointer to 'void *' is disallowed with ARC

This fixes the compiler error, but gives a warning:

SCNetworkReachabilityContext context = {0, objc_unretainedPointer(self), NULL, NULL, NULL};

How to get rid of this warning?

Initializing 'void *' with an expression of type 'objc_objectptr_t' (aka 'const void *') discards qualifiers

你应该能够将自己（id）投给void *而没有问题。

SCNetworkReachabilityContext context = {0, ( void * )self, NULL, NULL, NULL};

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