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fix: numerical enum comparison #123

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@yuta-game-music yuta-game-music commented Apr 23, 2023

Currently, U# doesn't allow us to directly compare enum variable with number like:

EnumHoge fuga = EnumHoge.Fuga;
var comp = fuga >= 3;

When EnumHoge.Fuga is 1, our expected result is comp=false, but the current implementation transcodes like: var comp = fuga != 3;
which leads comp to be TRUE.

Note that this phenomenon doesn't occur when you write enum in the comparison code like: var comp = HogeEnum.Fuga >= 3;
because HogeEnum.Fuga is transcoded to const 1, which makes the >= operation int>=int.

This change let you appropreately convert fuga >= 3 as it is.

Currently, U# doesn't allow us to directly compare enum variable with number like:

EnumHoge fuga = EnumHoge.Fuga;
var comp = fuga >= 3;

When EnumHoge.Fuga is 1, our expected result is comp=false, but the current implementation transcodes like:
var comp = fuga != 3;
which leads comp to be TRUE.

Note that this phenomenon doesn't occur when you write enum in the comparison code like:
var comp = HogeEnum.Fuga >= 3;
because HogeEnum.Fuga is transcoded to const -1, which makes the >= operation int>=int.

This change let you appropreately convert fuga >= 3 as it is.
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I have read the CLA Document and I hereby sign the CLA

@yuta-game-music yuta-game-music changed the title numerical enum comparison fix: numerical enum comparison Apr 23, 2023
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This will fix #68

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