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AK: Allow testing Empty instances for equality
This also makes it possible to compare `Variant<Empty, Ts...>` objects if operator== exists for all Ts
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parent
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bf7af25a82
Notes:
sideshowbarker
2024-07-16 23:34:49 +09:00
Author: https://github.com/shannonbooth Commit: https://github.com/SerenityOS/serenity/commit/bf7af25a82 Pull-request: https://github.com/SerenityOS/serenity/pull/20219 Reviewed-by: https://github.com/Hendiadyoin1 Reviewed-by: https://github.com/alimpfard Reviewed-by: https://github.com/gmta
@ -217,6 +217,7 @@ using MergeAndDeduplicatePacks = InheritFromPacks<MakeIndexSequence<sizeof...(Ps
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namespace AK {
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struct Empty {
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constexpr bool operator==(Empty const&) const = default;
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};
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template<typename T>
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@ -273,3 +273,32 @@ TEST_CASE(type_list_specialization)
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EXPECT((IsSame<typename MyList::template Type<1>, int>));
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EXPECT((IsSame<typename MyList::template Type<2>, String>));
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}
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TEST_CASE(variant_equality)
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{
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using MyVariant = Variant<Empty, int, float>;
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{
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MyVariant variant1 = 1;
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MyVariant variant2 = 1;
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EXPECT_EQ(variant1, variant2);
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}
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{
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MyVariant variant1 = 1;
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MyVariant variant2 = 1.5f;
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EXPECT_NE(variant1, variant2);
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}
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{
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MyVariant variant1 = 1;
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MyVariant variant2;
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EXPECT_NE(variant1, variant2);
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}
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{
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MyVariant variant1;
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MyVariant variant2;
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EXPECT_EQ(variant1, variant2);
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}
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}
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