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refactor(templates): make FTypeInfo behave more like std::type_info and optimize TAny

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This commit is contained in:
_Redstone_c_
2022-04-05 17:00:33 +08:00
parent 2a3a5aec35
commit a539f70535
4 changed files with 60 additions and 65 deletions
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71
Redcraft.Utility/Source/Public/Templates/Any.h
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@ -135,11 +135,11 @@ struct TAny
template <typename T>
struct TIsTriviallyStorable : TBoolConstant<TIsInlineStorable<T>::Value && TIsTrivial<T>::Value && TIsTriviallyCopyable<T>::Value> { };
constexpr TAny() : TypeInfo(Typeid(void)), RTTI(nullptr) { }
constexpr TAny() : TypeInfo(nullptr), RTTI(nullptr) { }
constexpr TAny(FInvalid) : TAny() { }
TAny(const TAny& InValue)
FORCEINLINE TAny(const TAny& InValue)
: TypeInfo(InValue.TypeInfo), RTTI(InValue.RTTI)
{
if (!IsValid()) return;
@ -149,7 +149,7 @@ struct TAny
else DynamicValue = RTTI->CopyNew(InValue.GetData());
}
TAny(TAny&& InValue)
FORCEINLINE TAny(TAny&& InValue)
: TypeInfo(InValue.TypeInfo), RTTI(InValue.RTTI)
{
if (!IsValid()) return;
@ -159,14 +159,14 @@ struct TAny
else
{
DynamicValue = InValue.DynamicValue;
InValue.TypeInfo = Typeid(void);
InValue.TypeInfo = nullptr;
}
}
template <typename T, typename... Types> requires TIsObject<typename TDecay<T>::Type>::Value
&& (!TIsArray<typename TDecay<T>::Type>::Value) && TIsDestructible<typename TDecay<T>::Type>::Value
&& TIsConstructible<typename TDecay<T>::Type, Types...>::Value
explicit TAny(TInPlaceType<T>, Types&&... Args)
FORCEINLINE explicit TAny(TInPlaceType<T>, Types&&... Args)
{
using SelectedType = typename TDecay<T>::Type;
EmplaceImpl<SelectedType>(Forward<Types>(Args)...);
@ -175,15 +175,15 @@ struct TAny
template <typename T> requires (!TIsSame<typename TDecay<T>::Type, TAny>::Value) && (!TIsTInPlaceType<typename TDecay<T>::Type>::Value)
&& TIsObject<typename TDecay<T>::Type>::Value && (!TIsArray<typename TDecay<T>::Type>::Value) && TIsDestructible<typename TDecay<T>::Type>::Value
&& TIsConstructible<typename TDecay<T>::Type, T&&>::Value
TAny(T&& InValue) : TAny(InPlaceType<typename TDecay<T>::Type>, Forward<T>(InValue))
FORCEINLINE TAny(T&& InValue) : TAny(InPlaceType<typename TDecay<T>::Type>, Forward<T>(InValue))
{ }
~TAny()
FORCEINLINE ~TAny()
{
Reset();
ResetImpl();
}
TAny& operator=(const TAny& InValue)
FORCEINLINE TAny& operator=(const TAny& InValue)
{
if (&InValue == this) return *this;
@ -191,14 +191,14 @@ struct TAny
{
Reset();
}
else if (TypeInfo == InValue.TypeInfo)
else if (GetTypeInfo() == InValue.GetTypeInfo())
{
if (IsTrivial()) Memory::Memcpy(InlineValue, InValue.InlineValue);
else RTTI->CopyAssign(GetData(), InValue.GetData());
}
else
{
Reset();
ResetImpl();
TypeInfo = InValue.TypeInfo;
RTTI = InValue.RTTI;
@ -211,7 +211,7 @@ struct TAny
return *this;
}
TAny& operator=(TAny&& InValue)
FORCEINLINE TAny& operator=(TAny&& InValue)
{
if (&InValue == this) return *this;
@ -219,7 +219,7 @@ struct TAny
{
Reset();
}
else if (TypeInfo == InValue.TypeInfo)
else if (GetTypeInfo() == InValue.GetTypeInfo())
{
if (IsTrivial()) Memory::Memcpy(InlineValue, InValue.InlineValue);
else if (IsInline()) RTTI->MoveAssign(GetData(), InValue.GetData());
@ -227,12 +227,12 @@ struct TAny
{
RTTI->Delete(DynamicValue);
DynamicValue = InValue.DynamicValue;
InValue.TypeInfo = Typeid(void);
InValue.TypeInfo = nullptr;
}
}
else
{
Reset();
ResetImpl();
TypeInfo = InValue.TypeInfo;
RTTI = InValue.RTTI;
@ -248,11 +248,11 @@ struct TAny
template <typename T> requires (!TIsSame<typename TDecay<T>::Type, TAny>::Value) && (!TIsTInPlaceType<typename TDecay<T>::Type>::Value)
&& TIsObject<typename TDecay<T>::Type>::Value && (!TIsArray<typename TDecay<T>::Type>::Value) && TIsDestructible<typename TDecay<T>::Type>::Value
&& TIsConstructible<typename TDecay<T>::Type, T&&>::Value
TAny& operator=(T&& InValue)
FORCEINLINE TAny& operator=(T&& InValue)
{
using SelectedType = typename TDecay<T>::Type;
if (TypeInfo == Typeid(SelectedType))
if (HoldsAlternative<SelectedType>())
{
if constexpr (TIsTriviallyStorable<SelectedType>::Value)
Memory::Memcpy(&InlineValue, &InValue, sizeof(SelectedType));
@ -270,22 +270,23 @@ struct TAny
template <typename T, typename... Types> requires TIsObject<typename TDecay<T>::Type>::Value
&& (!TIsArray<typename TDecay<T>::Type>::Value) && TIsDestructible<typename TDecay<T>::Type>::Value
&& TIsConstructible<typename TDecay<T>::Type, T&&>::Value
typename TDecay<T>::Type& Emplace(Types&&... Args)
FORCEINLINE typename TDecay<T>::Type& Emplace(Types&&... Args)
{
Reset();
ResetImpl();
using SelectedType = typename TDecay<T>::Type;
EmplaceImpl<SelectedType>(Forward<Types>(Args)...);
return GetValue<SelectedType>();
}
constexpr FTypeInfo GetTypeInfo() const { return TypeInfo; }
constexpr bool IsValid() const { return TypeInfo != Typeid(void); }
constexpr explicit operator bool() const { return TypeInfo != Typeid(void); }
constexpr const FTypeInfo& GetTypeInfo() const { return TypeInfo != nullptr ? *TypeInfo : Typeid(void); }
constexpr bool IsValid() const { return TypeInfo != nullptr; }
constexpr explicit operator bool() const { return TypeInfo != nullptr; }
constexpr bool IsInline() const { return RTTI != nullptr ? RTTI->bIsInline : true; }
constexpr bool IsTrivial() const { return RTTI == nullptr; }
template <typename T> constexpr bool HoldsAlternative() const { return IsValid() ? TypeInfo == Typeid(T) : false; }
template <typename T> constexpr bool HoldsAlternative() const { return IsValid() ? GetTypeInfo() == Typeid(T) : false; }
constexpr void* GetData() { return IsInline() ? &InlineValue : DynamicValue; }
constexpr const void* GetData() const { return IsInline() ? &InlineValue : DynamicValue; }
@ -308,17 +309,10 @@ struct TAny
template <typename T> requires TIsSame<T, typename TDecay<T>::Type>::Value&& TIsObject<typename TDecay<T>::Type>::Value && (!TIsArray<typename TDecay<T>::Type>::Value) && TIsDestructible<typename TDecay<T>::Type>::Value
constexpr const T& Get(const T& DefaultValue) const& { return HoldsAlternative<T>() ? GetValue<T>() : DefaultValue; }
void Reset()
FORCEINLINE void Reset()
{
if (!IsValid()) return;
TypeInfo = Typeid(void);
if (IsTrivial());
else if (IsInline()) RTTI->Destroy(&InlineValue);
else RTTI->Delete(DynamicValue);
RTTI = nullptr;
TypeInfo = nullptr;
ResetImpl();
}
private:
@ -329,13 +323,13 @@ private:
void* DynamicValue;
};
FTypeInfo TypeInfo;
const FTypeInfo* TypeInfo;
const NAMESPACE_PRIVATE::FAnyRTTI* RTTI;
template <typename SelectedType, typename... Types>
FORCEINLINE void EmplaceImpl(Types&&... Args)
{
TypeInfo = Typeid(SelectedType);
TypeInfo = &Typeid(SelectedType);
if constexpr (TIsTriviallyStorable<SelectedType>::Value)
{
@ -354,6 +348,13 @@ private:
}
}
FORCEINLINE void ResetImpl()
{
if (!IsValid() || IsTrivial()) return;
else if (IsInline()) RTTI->Destroy(&InlineValue);
else RTTI->Delete(DynamicValue);
}
};
template <typename T, size_t InlineSize, size_t InlineAlignment>