Good question. Haven't heard of this distinction before. When I search for "class operators" I find this, but I doubt that is what you mean. This sounds more like it, but I haven't found the documentation for that. Maybe you can point me to the correct documentation?
Oops. I see now that the remark i made is a bit unclear. Sorry for that
(tbh i would have no idea how to call/name it otherwise)
Yes, i meant as in the second link you posted.
I was unable to find specific documentation on that in the available manuals. The information i got is from examples posted on the forums as well as the (test) examples that are part of the fpc project.
In short: an advanced record with the operator defined as class operator (just as showed in the 2nd link you posted).
There was a discussion on this board a while ago that there seem to be a difference between operators being global vs local when the type is being used/specialized when using generics, causing the incompatibility notice from the compiler.
Again, take note that i'm guessing that is what you are currently facing.
PS:
this might perhaps be able to help you out a little, except that FPC has other operator names (but those can be found in the FPC documentation).