Question

I use an external C library in my C++ program and the library uses a callback function, that must return void*. The library checks if return value is not NULL, which means success.

So what is the best way to tell it that all is fine?

I use:

return reinterpret_cast<void*>(1);

but it looks ugly…

Edit: thanks for reply, i will stay with this:

static int success;
return &success;

Answer 1

static int dummy;
return &dummy;

Strictly speaking, static is probably not required, but it feels a bit gauche to return a pointer to a local that’s going out of scope.

EDIT: Note @sharptooth’s comment. Strictly speaking, static is required.