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AK: Allow Optional<T&> to exist

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This implements Optional<T&> as a T*, whose presence has been missing
since the early days of Optional.
As a lot of find_foo() APIs return an Optional<T> which imposes a
pointless copy on the underlying value, and can sometimes be very
misleading, with this change, those APIs can return Optional<T&>.
This commit is contained in:
Ali Mohammad Pur 2022-04-03 15:36:34 +04:30 • committed by Andreas Kling
parent 8f1ba8db4f
commit 221ecf17d3
3 changed files with 238 additions and 1 deletions
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19
AK/StdLibExtraDetails.h
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@ -25,6 +25,24 @@ using TrueType = IntegralConstant<bool, true>;
template<class T>
using AddConst = const T;
template<class T>
struct __AddConstToReferencedType {
using Type = T;
};
template<class T>
struct __AddConstToReferencedType<T&> {
using Type = AddConst<T>&;
};
template<class T>
struct __AddConstToReferencedType<T&&> {
using Type = AddConst<T>&&;
};
template<class T>
using AddConstToReferencedType = typename __AddConstToReferencedType<T>::Type;
template<class T>
struct __RemoveConst {
using Type = T;
@ -577,6 +595,7 @@ inline constexpr bool IsOneOf = (IsSame<T, Ts> || ...);
}
using AK::Detail::AddConst;
using AK::Detail::AddConstToReferencedType;
using AK::Detail::AddLvalueReference;
using AK::Detail::AddRvalueReference;
using AK::Detail::AssertSize;