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refactor(templates): optimize visit functions for TOptional, TVariant and TAny, add necessary constraints

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This commit is contained in:
_Redstone_c_
2022-03-23 17:49:30 +08:00
parent 2f55c84c32
commit 0c6bf06a56
3 changed files with 64 additions and 56 deletions
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30
Redcraft.Utility/Source/Public/Templates/Optional.h
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@ -9,12 +9,12 @@ NAMESPACE_REDCRAFT_BEGIN
NAMESPACE_MODULE_BEGIN(Redcraft)
NAMESPACE_MODULE_BEGIN(Utility)
template <typename OptionalType> requires (TIsObject<OptionalType>::Value && !TIsArray<OptionalType>::Value&& TIsDestructible<OptionalType>::Value)
template <typename OptionalType> requires TIsObject<OptionalType>::Value && (!TIsArray<OptionalType>::Value) && TIsDestructible<OptionalType>::Value
struct TOptional
{
public:
using Type = OptionalType;
using ValueType = OptionalType;
constexpr TOptional() : bIsValid(false) { }
@ -29,7 +29,7 @@ public:
template <typename T = OptionalType> requires TIsConstructible<OptionalType, T&&>::Value
&& (!TIsSame<typename TRemoveCVRef<T>::Type, FInPlace>::Value) && (!TIsSame<typename TRemoveCVRef<T>::Type, TOptional>::Value)
constexpr explicit(!TIsConvertible<T&&, OptionalType>::Value) TOptional(T&& InValue)
constexpr explicit (!TIsConvertible<T&&, OptionalType>::Value) TOptional(T&& InValue)
: TOptional(InPlace, Forward<T>(InValue))
{ }
@ -46,14 +46,14 @@ public:
}
template <typename T = OptionalType> requires TIsConstructible<OptionalType, const T&>::Value
constexpr explicit(!TIsConvertible<const T&, OptionalType>::Value) TOptional(const TOptional<T>& InValue)
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
constexpr explicit(!TIsConvertible<T&&, OptionalType>::Value) TOptional(TOptional<T>&& InValue)
constexpr explicit (!TIsConvertible<T&&, OptionalType>::Value) TOptional(TOptional<T>&& InValue)
: bIsValid(InValue.IsValid())
{
if (InValue.IsValid()) new(&Value) OptionalType(MoveTemp(InValue.GetValue()));
@ -61,7 +61,7 @@ public:
constexpr ~TOptional()
{
Reset();
if constexpr (!TIsTriviallyDestructible<OptionalType>::Value) Reset();
}
constexpr TOptional& operator=(const TOptional& InValue)
@ -168,11 +168,14 @@ public:
constexpr bool IsValid() const { return bIsValid; }
constexpr explicit operator bool() const { return bIsValid; }
constexpr void* GetData() { return &Value; }
constexpr const void* GetData() const { return &Value; }
constexpr OptionalType& GetValue() & { checkf(IsValid(), TEXT("It is an error to call GetValue() on an unset TOptional. Please either check IsValid() or use Get(DefaultValue) instead.")); return *(OptionalType*)&Value; }
constexpr OptionalType&& GetValue() && { checkf(IsValid(), TEXT("It is an error to call GetValue() on an unset TOptional. Please either check IsValid() or use Get(DefaultValue) instead.")); return MoveTemp(*(OptionalType*)&Value); }
constexpr const OptionalType& GetValue() const& { checkf(IsValid(), TEXT("It is an error to call GetValue() on an unset TOptional. Please either check IsValid() or use Get(DefaultValue) instead.")); return *(OptionalType*)&Value; }
constexpr const OptionalType&& GetValue() const&& { checkf(IsValid(), TEXT("It is an error to call GetValue() on an unset TOptional. Please either check IsValid() or use Get(DefaultValue) instead.")); return MoveTemp(*(OptionalType*)&Value); }
constexpr OptionalType& GetValue() & { checkf(IsValid(), TEXT("It is an error to call GetValue() on an unset TOptional. Please either check IsValid() or use Get(DefaultValue) instead.")); return *reinterpret_cast< OptionalType*>(&Value); }
constexpr OptionalType&& GetValue() && { checkf(IsValid(), TEXT("It is an error to call GetValue() on an unset TOptional. Please either check IsValid() or use Get(DefaultValue) instead.")); return MoveTemp(*reinterpret_cast< OptionalType*>(&Value)); }
constexpr const OptionalType& GetValue() const& { checkf(IsValid(), TEXT("It is an error to call GetValue() on an unset TOptional. Please either check IsValid() or use Get(DefaultValue) instead.")); return *reinterpret_cast<const OptionalType*>(&Value); }
constexpr const OptionalType&& GetValue() const&& { checkf(IsValid(), TEXT("It is an error to call GetValue() on an unset TOptional. Please either check IsValid() or use Get(DefaultValue) instead.")); return MoveTemp(*reinterpret_cast<const OptionalType*>(&Value)); }
constexpr const OptionalType* operator->() const { return &GetValue(); }
constexpr OptionalType* operator->() { return &GetValue(); }
@ -182,11 +185,8 @@ public:
constexpr const OptionalType& operator*() const& { return GetValue(); }
constexpr const OptionalType&& operator*() const&& { return GetValue(); }
template <typename T = OptionalType>
constexpr OptionalType Get(T&& DefaultValue) && { return IsValid() ? GetValue() : DefaultValue; }
template <typename T = OptionalType>
constexpr OptionalType Get(T&& DefaultValue) const& { return IsValid() ? GetValue() : DefaultValue; }
constexpr OptionalType& Get( OptionalType& DefaultValue) & { return IsValid() ? GetValue() : DefaultValue; }
constexpr const OptionalType& Get(const OptionalType& DefaultValue) const& { return IsValid() ? GetValue() : DefaultValue; }
constexpr void Reset()
{