geopoly_overlap return codes
(1) By Boris (boris.gontar) on 2020-04-22 21:39:54 [link] [source]
The source code of geopoly.c contains very useful comment on return codes of geopoly_overlap:
** 0 The two polygons are disjoint ** 1 They overlap ** 2 P1 is completely contained within P2 ** 3 P2 is completely contained within P1 ** 4 P1 and P2 are the same polygon ** NULL Either P1 or P2 or both are not valid polygons
The doc page only mentions zero and non-zero return codes. Is it intentional and it's better not to rely on the comment above?
(2) By Richard Hipp (drh) on 2020-04-22 23:28:37 in reply to 1 [source]
I left the description a little vague with the idea that I might change or enhance it in the future. When you promise to support something for decades into the future, it is important to leave wiggle room.
I don't have any plans to change the return values of the geopoly_overlap() function. You can probably go ahead and use them if you want to. But if in the future I do need to change them - no tears. OK?
(3) By Boris (boris.gontar) on 2020-04-23 00:12:40 in reply to 2 [link] [source]