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refactor(templates): refining TOptional's constraints

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This commit is contained in:
_Redstone_c_ 2022-04-13 22:35:30 +08:00
parent 4f769a9207
commit 5c82ab1e0d
1 changed files with 19 additions and 5 deletions
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24
Redcraft.Utility/Source/Public/Templates/Optional.h
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@ -14,6 +14,20 @@ NAMESPACE_MODULE_BEGIN(Utility)
template <typename OptionalType> requires TIsObject<OptionalType>::Value && (!TIsArray<OptionalType>::Value) && TIsDestructible<OptionalType>::Value
struct TOptional
{
private:
template <typename T>
struct TAllowUnwrapping : TBoolConstant<!(
TIsConstructible<OptionalType, TOptional<T>& >::Value
|| TIsConstructible<OptionalType, const TOptional<T>& >::Value
|| TIsConstructible<OptionalType, TOptional<T>&&>::Value
|| TIsConstructible<OptionalType, const TOptional<T>&&>::Value
|| TIsConvertible< TOptional<T>&, OptionalType>::Value
|| TIsConvertible<const TOptional<T>&, OptionalType>::Value
|| TIsConvertible< TOptional<T>&&, OptionalType>::Value
|| TIsConvertible<const TOptional<T>&&, OptionalType>::Value
)> { };
public:
using ValueType = OptionalType;
@ -47,14 +61,14 @@ public:
if (InValue.IsValid()) new(&Value) OptionalType(MoveTemp(InValue.GetValue()));
}
template <typename T = OptionalType> requires TIsConstructible<OptionalType, const T&>::Value
template <typename T = OptionalType> requires TIsConstructible<OptionalType, const T&>::Value && TAllowUnwrapping<T>::Value
constexpr explicit (!TIsConvertible<const T&, OptionalType>::Value) TOptional(const TOptional<T>& InValue)
: bIsValid(InValue.IsValid())
{
if (InValue.IsValid()) new(&Value) OptionalType(InValue.GetValue());
}
template <typename T = OptionalType> requires TIsConstructible<OptionalType, T&&>::Value
template <typename T = OptionalType> requires TIsConstructible<OptionalType, T&&>::Value && TAllowUnwrapping<T>::Value
constexpr explicit (!TIsConvertible<T&&, OptionalType>::Value) TOptional(TOptional<T>&& InValue)
: bIsValid(InValue.IsValid())
{
@ -106,7 +120,7 @@ public:
return *this;
}
template <typename T = OptionalType> requires TIsConstructible<OptionalType, const T&>::Value && TIsAssignable<OptionalType, const T&>::Value
template <typename T = OptionalType> requires TIsConstructible<OptionalType, const T&>::Value && TIsAssignable<OptionalType, const T&>::Value && TAllowUnwrapping<T>::Value
constexpr TOptional& operator=(const TOptional<T>& InValue)
{
if (&InValue == this) return *this;
@ -127,7 +141,7 @@ public:
return *this;
}
template <typename T = OptionalType> requires TIsConstructible<OptionalType, T&&>::Value && TIsAssignable<OptionalType, T&&>::Value
template <typename T = OptionalType> requires TIsConstructible<OptionalType, T&&>::Value && TIsAssignable<OptionalType, T&&>::Value && TAllowUnwrapping<T>::Value
constexpr TOptional& operator=(TOptional<T>&& InValue)
{
if (&InValue == this) return *this;
@ -219,7 +233,7 @@ private:
};
template <typename T>
TOptional(T) ->TOptional<T>;
TOptional(T) -> TOptional<T>;
template <typename T, typename U> requires CWeaklyEqualityComparableWith<T, U>
constexpr bool operator==(const TOptional<T>& LHS, const TOptional<U>& RHS)