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AK: Add explicit Variant conversion operators

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This allows converting between Variants of different types with less
pain.
This commit is contained in:
Ali Mohammad Pur 2021-06-27 00:04:46 +04:30 committed by Linus Groh
parent dff3439ad0
commit bda19a9ff3
Notes: sideshowbarker 2024-07-18 11:27:46 +09:00 
Author: https://github.com/alimpfard
Commit: https://github.com/SerenityOS/serenity/commit/bda19a9ff3a
Pull-request: https://github.com/SerenityOS/serenity/pull/8264
Reviewed-by: https://github.com/Lubrsi ✅
1 changed files with 13 additions and 1 deletions
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14
AK/Variant.h
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@ -331,7 +331,7 @@ public:
}
template<typename... NewTs>
Variant<NewTs...> downcast() &
Variant<NewTs...> downcast() const&
{
Variant<NewTs...> instance { Variant<NewTs...>::invalid_index, Detail::VariantConstructTag {} };
visit([&](const auto& value) {
@ -342,6 +342,18 @@ public:
return instance;
}
template<typename... NewTs>
explicit operator Variant<NewTs...>() &&
{
return downcast<NewTs...>();
}
template<typename... NewTs>
explicit operator Variant<NewTs...>() const&
{
return downcast<NewTs...>();
}
private:
static constexpr auto data_size = integer_sequence_generate_array<size_t>(0, IntegerSequence<size_t, sizeof(Ts)...>()).max();
static constexpr auto data_alignment = integer_sequence_generate_array<size_t>(0, IntegerSequence<size_t, alignof(Ts)...>()).max();