Why do nil / NULL blocks cause bus errors when run?

Question

I started using blocks a lot and soon noticed that nil blocks cause bus errors:

typedef void (^SimpleBlock)(void);
SimpleBlock aBlock = nil;
aBlock(); // bus         


        

Answer 1

This is my simple nicest solution… Maybe there is possible to write one universal run function with those c var-args but I don’t know how to write that.

void run(void (^block)()) {
    if (block)block();
}

void runWith(void (^block)(id), id value) {
    if (block)block(value);
}