Passing block parameter that doesn't match signature

Question

I\'m working with a block-based API and stumbled across a scenario where I was passing in a block parameter that had a signature that didn\'t match the typedef\'d parameter

Answer 1

This is a C thing. A function or block prototype with an empty argument list means "the function (or block) takes any arguments you like". If you want to convey that the block should have no arguments, you need to explicitly say so like this:

typedef void(^MyBlock)(void)

This is largely historical from the days before ANSI when there weren't function prototypes and all function declarations (as opposed to definitions) looked like this:

some_type function();