Check if nullptr in Dart FFI

What would be the best way to check if a pointer is a nullpointer in Dart using FFI?

Current approach is this:

ffi.Pointer<Thing> thing = ... // can potentially return null
if(thing == ffi.nullptr) {
 ...

But, of course, this gives a "Equality operator == invocation with references of unrelated types." warning message.

The API is still quite new, and I am not exactly sure how to approach this. I could also be overthinking this and there's a super simple answer.

Solution

Well, I have yet to try dart:ffi but from the API documentation for == you can see:

Equality for Pointers only depends on their address

So, what you can do is just to compare the address of the two pointers:

ffi.Pointer<Thing> thing = ... // can potentially return null
if(thing.address == ffi.nullptr.address) {
 ...

In fact, a nullpointer are just a Pointer which points to the address 0:

final Pointer<Void> nullptr = Pointer.fromAddress(0)