Question

I’m working on a C++ project and one of the libraries that I’m using has the following line:

typedef void (*thread_startfunc_t) (void *);

Can someone please explain what this is doing. Thanks

Answer 1

It defines thread_startfunc_t as a synonym for the type “pointer to a function that takes a single argument, of type void *, and returns void“.

Note that the _t suffix is actually reserved by POSIX, so I think this is bad code in that respect, but the use of a typedef for pointer-to-function types is always a good idea. This is a very common practice.