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feat(containers): add TFunctionalInputIterator and operations support

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This commit is contained in:
_Redstone_c_ 2023-02-18 19:09:39 +08:00
parent f521c2b5d5
commit 5909d20605
1 changed files with 68 additions and 11 deletions
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79
Redcraft.Utility/Source/Public/Containers/Iterator.h
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@ -1,7 +1,9 @@
#pragma once #pragma once
#include "CoreTypes.h" #include "CoreTypes.h"
#include "Templates/Invoke.h"
#include "Templates/Utility.h" #include "Templates/Utility.h"
#include "Templates/Noncopyable.h"
#include "TypeTraits/TypeTraits.h" #include "TypeTraits/TypeTraits.h"
#include "Miscellaneous/Compare.h" #include "Miscellaneous/Compare.h"
#include "Miscellaneous/AssertionMacros.h" #include "Miscellaneous/AssertionMacros.h"
@ -35,17 +37,17 @@ template <typename T>
concept CDereferenceable = requires(T& A) { { *A } -> CReferenceable; }; concept CDereferenceable = requires(T& A) { { *A } -> CReferenceable; };
template <typename I> template <typename I>
using TIteratorElementType = typename NAMESPACE_PRIVATE::TIteratorElementType<I>::Type; using TIteratorElementType = typename NAMESPACE_PRIVATE::TIteratorElementType<TRemoveCVRef<I>>::Type;
template <CReferenceable I> template <CReferenceable I>
using TIteratorReferenceType = decltype(*DeclVal<I&>()); using TIteratorReferenceType = decltype(*DeclVal<I&>());
template <CReferenceable T> requires (requires(T& Iter) { { MoveTemp(*Iter) } -> CReferenceable; }) template <CReferenceable I> requires (requires(I& Iter) { { MoveTemp(*Iter) } -> CReferenceable; })
using TIteratorRValueReferenceType = decltype(MoveTemp(*DeclVal<T&>())); using TIteratorRValueReferenceType = decltype(MoveTemp(*DeclVal<I&>()));
template <typename I> template <typename I>
concept CIndirectlyReadable = concept CIndirectlyReadable =
requires(const I Iter) requires(const TRemoveCVRef<I> Iter)
{ {
typename TIteratorElementType<I>; typename TIteratorElementType<I>;
typename TIteratorReferenceType<I>; typename TIteratorReferenceType<I>;
@ -59,7 +61,7 @@ concept CIndirectlyReadable =
template <typename I, typename T> template <typename I, typename T>
concept CIndirectlyWritable = concept CIndirectlyWritable =
requires(I && Iter, T && A) requires(I&& Iter, T&& A)
{ {
*Iter = Forward<T>(A); *Iter = Forward<T>(A);
*Forward<I>(Iter) = Forward<T>(A); *Forward<I>(Iter) = Forward<T>(A);
@ -68,7 +70,7 @@ concept CIndirectlyWritable =
}; };
template <typename I> template <typename I>
concept CWeaklyIncrementable = CDefaultConstructible<I> && CMovable<I> concept CWeaklyIncrementable = CMovable<I>
&& requires(I Iter) { { ++Iter } -> CSameAs<I&>; Iter++; }; && requires(I Iter) { { ++Iter } -> CSameAs<I&>; Iter++; };
template <typename I> template <typename I>
@ -180,7 +182,8 @@ public:
NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(const TReverseIterator& LHS, const TReverseIterator& RHS) { return RHS.GetBase() - LHS.GetBase(); } NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(const TReverseIterator& LHS, const TReverseIterator& RHS) { return RHS.GetBase() - LHS.GetBase(); }
NODISCARD FORCEINLINE constexpr IteratorType GetBase() const { return Current; } NODISCARD FORCEINLINE constexpr const IteratorType& GetBase() const& { return Current; }
NODISCARD FORCEINLINE constexpr IteratorType GetBase() && { return Current; }
private: private:
@ -249,7 +252,8 @@ public:
NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(const TMoveIterator& LHS, const TMoveIterator& RHS) { return LHS.GetBase() - RHS.GetBase(); } NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(const TMoveIterator& LHS, const TMoveIterator& RHS) { return LHS.GetBase() - RHS.GetBase(); }
NODISCARD FORCEINLINE constexpr IteratorType GetBase() const { return Current; } NODISCARD FORCEINLINE constexpr const IteratorType& GetBase() const& { return Current; }
NODISCARD FORCEINLINE constexpr IteratorType GetBase() && { return Current; }
private: private:
@ -297,7 +301,8 @@ public:
template <CInputIterator I> requires (CSizedSentinelFor<SentinelType, I>) template <CInputIterator I> requires (CSizedSentinelFor<SentinelType, I>)
NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(const TMoveIterator<I>& Iter, const TMoveSentinel& Sentinel) { return Iter.GetBase() - Sentinel.GetBase(); } NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(const TMoveIterator<I>& Iter, const TMoveSentinel& Sentinel) { return Iter.GetBase() - Sentinel.GetBase(); }
NODISCARD FORCEINLINE constexpr SentinelType GetBase() const { return Last; } NODISCARD FORCEINLINE constexpr const SentinelType& GetBase() const& { return Last; }
NODISCARD FORCEINLINE constexpr SentinelType GetBase() && { return Last; }
private: private:
@ -391,8 +396,9 @@ public:
NODISCARD FORCEINLINE constexpr explicit operator ElementType*() requires (CContiguousIterator<IteratorType> && !CConst<ElementType>) { CheckThis(); return Current; } NODISCARD FORCEINLINE constexpr explicit operator ElementType*() requires (CContiguousIterator<IteratorType> && !CConst<ElementType>) { CheckThis(); return Current; }
NODISCARD FORCEINLINE constexpr explicit operator const ElementType*() const requires (CContiguousIterator<IteratorType>) { CheckThis(); return Current; } NODISCARD FORCEINLINE constexpr explicit operator const ElementType*() const requires (CContiguousIterator<IteratorType>) { CheckThis(); return Current; }
NODISCARD FORCEINLINE constexpr IteratorType GetBase() const { CheckThis(); return Current; } NODISCARD FORCEINLINE constexpr const IteratorType& GetBase() const& { CheckThis(); return Current; }
NODISCARD FORCEINLINE constexpr ptrdiff Num() const { CheckThis(); return Length; } NODISCARD FORCEINLINE constexpr IteratorType GetBase() && { CheckThis(); return Current; }
NODISCARD FORCEINLINE constexpr ptrdiff Num() const { CheckThis(); return Length; }
private: private:
@ -417,6 +423,57 @@ private:
static_assert(CContiguousIterator<TCountedIterator<int32*>>); static_assert(CContiguousIterator<TCountedIterator<int32*>>);
static_assert(CSizedSentinelFor<FDefaultSentinel, TCountedIterator<int32*>>); static_assert(CSizedSentinelFor<FDefaultSentinel, TCountedIterator<int32*>>);
template <typename I>
TCountedIterator(I, ptrdiff) -> TCountedIterator<I>;
template <CInvocable F, CInvocable G> requires (CReferenceable<TInvokeResult<F>> && CBooleanTestable<TInvokeResult<G>> && CMovable<F> && CMovable<G>)
class TFunctionalInputIterator final : private FNoncopyable
{
public:
using Inputer = F;
using Sentinel = G;
using ElementType = TRemoveReference<TInvokeResult<Inputer>>;
FORCEINLINE constexpr TFunctionalInputIterator() = default;
FORCEINLINE constexpr TFunctionalInputIterator(TFunctionalInputIterator&&) = default;
FORCEINLINE constexpr TFunctionalInputIterator& operator=(TFunctionalInputIterator&&) = default;
template <typename T, typename U> requires (CConvertibleTo<T, Inputer> && CConvertibleTo<U, Sentinel>)
FORCEINLINE constexpr TFunctionalInputIterator(T&& InInputer, U&& InSentinel) : InputerStorage(Forward<T>(InInputer)), SentinelStorage(Forward<U>(InSentinel)), bIsConsumed(false) { }
NODISCARD FORCEINLINE constexpr bool operator==(FDefaultSentinel) const& { return Invoke(SentinelStorage); }
NODISCARD FORCEINLINE constexpr decltype(auto) operator*() const { checkf(!bIsConsumed, TEXT("The element are consumed. Please check IsConsumed().")); bIsConsumed = true; return Invoke(InputerStorage); }
NODISCARD FORCEINLINE constexpr void operator->() const = delete;
FORCEINLINE constexpr TFunctionalInputIterator& operator++() { if (!bIsConsumed) Invoke(InputerStorage); bIsConsumed = false; return *this; }
FORCEINLINE constexpr void operator++(int) { if (!bIsConsumed) Invoke(InputerStorage); bIsConsumed = false; }
NODISCARD FORCEINLINE constexpr const Inputer& GetInputer() const& { return InputerStorage; }
NODISCARD FORCEINLINE constexpr Inputer GetInputer() && { return InputerStorage; }
NODISCARD FORCEINLINE constexpr const Sentinel& GetSentinel() const& { return SentinelStorage; }
NODISCARD FORCEINLINE constexpr Sentinel GetSentinel() && { return SentinelStorage; }
NODISCARD FORCEINLINE constexpr bool IsConsumed() const { return bIsConsumed; }
private:
Inputer InputerStorage;
Sentinel SentinelStorage;
mutable bool bIsConsumed;
};
static_assert(CInputIterator<TFunctionalInputIterator<int32(*)(), bool(*)()>>);
template <typename F, typename G>
TFunctionalInputIterator(F, G) -> TFunctionalInputIterator<F, G>;
NAMESPACE_BEGIN(Iteration) NAMESPACE_BEGIN(Iteration)
/** Increments given iterator 'Iter' by 'N' elements. */ /** Increments given iterator 'Iter' by 'N' elements. */