feat(containers): add TCountedIterator and operations support
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4bbb8e395a
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@ -125,7 +125,7 @@ public:
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NODISCARD FORCEINLINE constexpr ElementType& operator*() const { CheckThis(true); return *Pointer; }
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NODISCARD FORCEINLINE constexpr ElementType* operator->() const { CheckThis(true); return Pointer; }
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NODISCARD FORCEINLINE constexpr ElementType& operator[](ptrdiff Index) const { TArrayIterator Temp = *this + Index; Temp.CheckThis(); return *Temp; }
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NODISCARD FORCEINLINE constexpr ElementType& operator[](ptrdiff Index) const { TArrayIterator Temp = *this + Index; return *Temp; }
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FORCEINLINE constexpr TArrayIterator& operator++() { ++Pointer; CheckThis(); return *this; }
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FORCEINLINE constexpr TArrayIterator& operator--() { --Pointer; CheckThis(); return *this; }
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@ -136,21 +136,15 @@ public:
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FORCEINLINE constexpr TArrayIterator& operator+=(ptrdiff Offset) { Pointer += Offset; CheckThis(); return *this; }
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FORCEINLINE constexpr TArrayIterator& operator-=(ptrdiff Offset) { Pointer -= Offset; CheckThis(); return *this; }
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NODISCARD friend FORCEINLINE constexpr TArrayIterator operator+(TArrayIterator Iter, ptrdiff Offset) { TArrayIterator Temp = Iter; Temp += Offset; Temp.CheckThis(); return Temp; }
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NODISCARD friend FORCEINLINE constexpr TArrayIterator operator+(ptrdiff Offset, TArrayIterator Iter) { TArrayIterator Temp = Iter; Temp += Offset; Temp.CheckThis(); return Temp; }
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NODISCARD friend FORCEINLINE constexpr TArrayIterator operator+(TArrayIterator Iter, ptrdiff Offset) { TArrayIterator Temp = Iter; Temp += Offset; return Temp; }
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NODISCARD friend FORCEINLINE constexpr TArrayIterator operator+(ptrdiff Offset, TArrayIterator Iter) { TArrayIterator Temp = Iter; Temp += Offset; return Temp; }
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NODISCARD FORCEINLINE constexpr TArrayIterator operator-(ptrdiff Offset) const { TArrayIterator Temp = *this; Temp -= Offset; Temp.CheckThis(); return Temp; }
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NODISCARD FORCEINLINE constexpr TArrayIterator operator-(ptrdiff Offset) const { TArrayIterator Temp = *this; Temp -= Offset; return Temp; }
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NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(const TArrayIterator& LHS, const TArrayIterator& RHS)
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{
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LHS.CheckThis();
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RHS.CheckThis();
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NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(const TArrayIterator& LHS, const TArrayIterator& RHS) { LHS.CheckThis(); RHS.CheckThis(); return LHS.Pointer - RHS.Pointer; }
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return LHS.Pointer - RHS.Pointer;
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}
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NODISCARD FORCEINLINE constexpr explicit operator ElementType*() requires (!CConst<ElementType>) { return Pointer; }
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NODISCARD FORCEINLINE constexpr explicit operator const ElementType*() const { return Pointer; }
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NODISCARD FORCEINLINE constexpr explicit operator ElementType*() requires (!CConst<ElementType>) { CheckThis(); return Pointer; }
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NODISCARD FORCEINLINE constexpr explicit operator const ElementType*() const { CheckThis(); return Pointer; }
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private:
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@ -153,11 +153,11 @@ public:
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template <CBidirectionalIterator J> requires (!CSameAs<IteratorType, J> && CConvertibleTo<const J&, IteratorType> && CAssignableFrom<IteratorType&, const J&>)
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FORCEINLINE constexpr TReverseIterator& operator=(const TReverseIterator<J>& InValue) { Current = InValue.GetBase(); return *this; }
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template <CBidirectionalIterator J> requires (CWeaklyEqualityComparable<IteratorType, J>)
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template <CBidirectionalIterator J> requires (CSentinelFor<J, IteratorType>)
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NODISCARD friend FORCEINLINE constexpr bool operator==(const TReverseIterator& LHS, const TReverseIterator<J>& RHS) { return LHS.GetBase() == RHS.GetBase(); }
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template <CBidirectionalIterator J> requires (CThreeWayComparable<IteratorType, J>)
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NODISCARD friend FORCEINLINE constexpr TCompareThreeWayResult<IteratorType, J> operator<=>(const TReverseIterator& LHS, const TReverseIterator<J>& RHS) { return RHS.GetBase() <=> LHS.GetBase(); }
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template <CBidirectionalIterator J> requires (CSizedSentinelFor<J, IteratorType>)
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NODISCARD friend FORCEINLINE constexpr TCompareThreeWayResult<J, IteratorType> operator<=>(const TReverseIterator& LHS, const TReverseIterator<J>& RHS) { return RHS.GetBase() <=> LHS.GetBase(); }
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NODISCARD FORCEINLINE constexpr ElementType& operator*() const { IteratorType Temp = GetBase(); return *--Temp; }
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NODISCARD FORCEINLINE constexpr ElementType* operator->() const { return AddressOf(operator*()); }
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@ -176,10 +176,9 @@ public:
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NODISCARD friend FORCEINLINE constexpr TReverseIterator operator+(TReverseIterator Iter, ptrdiff Offset) requires (CRandomAccessIterator<IteratorType>) { TReverseIterator Temp = Iter; Temp -= Offset; return Temp; }
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NODISCARD friend FORCEINLINE constexpr TReverseIterator operator+(ptrdiff Offset, TReverseIterator Iter) requires (CRandomAccessIterator<IteratorType>) { TReverseIterator Temp = Iter; Temp -= Offset; return Temp; }
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NODISCARD FORCEINLINE constexpr TReverseIterator operator-(ptrdiff Offset) const requires (CRandomAccessIterator<IteratorType>) { return TReverseIterator(GetBase() + Offset); }
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NODISCARD FORCEINLINE constexpr TReverseIterator operator-(ptrdiff Offset) const requires (CRandomAccessIterator<IteratorType>) { TReverseIterator Temp = *this; Temp += Offset; return Temp; }
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template <CBidirectionalIterator J> requires (requires(IteratorType Iter, J Jter) { { Iter - Jter } -> CSameAs<ptrdiff>; })
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NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(const TReverseIterator& LHS, const TReverseIterator<J>& RHS) { return RHS.GetBase() - LHS.GetBase(); }
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NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(const TReverseIterator& LHS, const TReverseIterator& RHS) { return RHS.GetBase() - LHS.GetBase(); }
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NODISCARD FORCEINLINE constexpr IteratorType GetBase() const { return Current; }
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@ -197,9 +196,7 @@ TReverseIterator(I) -> TReverseIterator<I>;
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template <typename I, typename J> requires (!CSizedSentinelFor<I, J>)
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inline constexpr bool bDisableSizedSentinelFor<TReverseIterator<I>, TReverseIterator<J>> = true;
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template <CSemiregular S>
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class TMoveSentinel;
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/** An iterator adaptor which dereferences to an rvalue reference. */
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template <CInputIterator I>
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class TMoveIterator final
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{
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@ -224,21 +221,21 @@ public:
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template <CInputIterator J> requires (!CSameAs<IteratorType, J> && CConvertibleTo<const J&, IteratorType> && CAssignableFrom<IteratorType&, const J&>)
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FORCEINLINE constexpr TMoveIterator& operator=(const TMoveIterator<J>& InValue) { Current = InValue.GetBase(); return *this; }
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template <CInputIterator J> requires (CWeaklyEqualityComparable<IteratorType, J>)
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template <CInputIterator J> requires (CSentinelFor<J, IteratorType>)
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NODISCARD friend FORCEINLINE constexpr bool operator==(const TMoveIterator& LHS, const TMoveIterator<J>& RHS) { return LHS.GetBase() == RHS.GetBase(); }
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template <CInputIterator J> requires (CThreeWayComparable<IteratorType, J>)
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NODISCARD friend FORCEINLINE constexpr TCompareThreeWayResult<IteratorType, J> operator<=>(const TMoveIterator& LHS, const TMoveIterator<J>& RHS) { return LHS.GetBase() <=> RHS.GetBase(); }
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template <CInputIterator J> requires (CSizedSentinelFor<J, IteratorType>)
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NODISCARD friend FORCEINLINE constexpr TCompareThreeWayResult<J, IteratorType> operator<=>(const TMoveIterator& LHS, const TMoveIterator<J>& RHS) { return LHS.GetBase() <=> RHS.GetBase(); }
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NODISCARD FORCEINLINE constexpr ElementType&& operator*() const { return MoveTemp(*GetBase()); }
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NODISCARD FORCEINLINE constexpr ElementType* operator->() const = delete;
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NODISCARD FORCEINLINE constexpr ElementType&& operator[](ptrdiff Index) const requires (CRandomAccessIterator<IteratorType>) { return MoveTemp(GetBase()[Index]); }
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NODISCARD FORCEINLINE constexpr ElementType&& operator[](ptrdiff Index) const requires (CRandomAccessIterator<IteratorType>) { return MoveTemp(GetBase()[Index]); }
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FORCEINLINE constexpr TMoveIterator& operator++() { ++Current; return *this; }
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FORCEINLINE constexpr TMoveIterator& operator--() requires (CBidirectionalIterator<IteratorType>) { --Current; return *this; }
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FORCEINLINE constexpr void operator++(int) { return TMoveIterator(Current++); }
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FORCEINLINE constexpr void operator++(int) { Current++; }
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FORCEINLINE constexpr TMoveIterator operator++(int) requires (CForwardIterator<IteratorType>) { return TMoveIterator(Current++); }
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FORCEINLINE constexpr TMoveIterator operator--(int) requires (CBidirectionalIterator<IteratorType>) { return TMoveIterator(Current--); }
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@ -248,10 +245,9 @@ public:
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NODISCARD friend FORCEINLINE constexpr TMoveIterator operator+(TMoveIterator Iter, ptrdiff Offset) requires (CRandomAccessIterator<IteratorType>) { TMoveIterator Temp = Iter; Temp += Offset; return Temp; }
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NODISCARD friend FORCEINLINE constexpr TMoveIterator operator+(ptrdiff Offset, TMoveIterator Iter) requires (CRandomAccessIterator<IteratorType>) { TMoveIterator Temp = Iter; Temp += Offset; return Temp; }
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NODISCARD FORCEINLINE constexpr TMoveIterator operator-(ptrdiff Offset) const requires (CRandomAccessIterator<IteratorType>) { return TMoveIterator(GetBase() - Offset); }
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NODISCARD FORCEINLINE constexpr TMoveIterator operator-(ptrdiff Offset) const requires (CRandomAccessIterator<IteratorType>) { TMoveIterator Temp = *this; Temp -= Offset; return Temp; }
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template <CInputIterator J> requires (requires(IteratorType Iter, J Jter) { { Iter - Jter } -> CSameAs<ptrdiff>; })
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NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(const TMoveIterator& LHS, const TMoveIterator<J>& RHS) { return LHS.GetBase() - RHS.GetBase(); }
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NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(const TMoveIterator& LHS, const TMoveIterator& RHS) { return LHS.GetBase() - RHS.GetBase(); }
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NODISCARD FORCEINLINE constexpr IteratorType GetBase() const { return Current; }
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@ -266,6 +262,7 @@ static_assert(CRandomAccessIterator<TMoveIterator<int32*>>);
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template <typename I>
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TMoveIterator(I) -> TMoveIterator<I>;
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/** A sentinel adaptor for use with TMoveIterator. */
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template <CSemiregular S>
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class TMoveSentinel
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{
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@ -313,6 +310,113 @@ static_assert(CSizedSentinelFor<TMoveSentinel<int32*>, TMoveIterator<int32*>>);
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template <typename I>
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TMoveSentinel(I) -> TMoveSentinel<I>;
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struct FDefaultSentinel { explicit FDefaultSentinel() = default; };
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inline constexpr FDefaultSentinel DefaultSentinel{ };
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struct FUnreachableSentinel
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{
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explicit FUnreachableSentinel() = default;
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template<CInputOrOutputIterator I>
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NODISCARD FORCEINLINE constexpr bool operator==(const I&) const& { return false; }
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};
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inline constexpr FUnreachableSentinel UnreachableSentinel{ };
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/** An iterator adaptor that tracks the distance to the end of the range. */
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template <CInputOrOutputIterator I>
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class TCountedIterator final
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{
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public:
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using IteratorType = I;
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using ElementType = TIteratorElementType<I>;
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# if DO_CHECK
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FORCEINLINE constexpr TCountedIterator() requires CDefaultConstructible<IteratorType> : Length(1), MaxLength(0) { };
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# else
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FORCEINLINE constexpr TCountedIterator() requires CDefaultConstructible<IteratorType> = default;
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# endif
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FORCEINLINE constexpr TCountedIterator(const TCountedIterator&) = default;
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FORCEINLINE constexpr TCountedIterator(TCountedIterator&&) = default;
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FORCEINLINE constexpr TCountedIterator& operator=(const TCountedIterator&) = default;
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FORCEINLINE constexpr TCountedIterator& operator=(TCountedIterator&&) = default;
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FORCEINLINE constexpr explicit TCountedIterator(IteratorType InValue, ptrdiff N) : Current(InValue), Length(N) { check_code({ MaxLength = N; }); }
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template <CInputOrOutputIterator J> requires (!CSameAs<IteratorType, J> && CConvertibleTo<const J&, IteratorType>)
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FORCEINLINE constexpr TCountedIterator(const TCountedIterator<J>& InValue) : Current(InValue.GetBase()), Length(InValue.Num()) { check_code({ MaxLength = InValue.Max(); }); }
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template <CInputOrOutputIterator J> requires (!CSameAs<IteratorType, J> && CConvertibleTo<const J&, IteratorType> && CAssignableFrom<IteratorType&, const J&>)
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FORCEINLINE constexpr TCountedIterator& operator=(const TCountedIterator<J>& InValue) { Current = InValue.GetBase(); Length = InValue.Num(); check_code({ MaxLength = InValue.Max(); }); return *this; }
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template <CInputOrOutputIterator J> requires (CSentinelFor<J, IteratorType>)
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NODISCARD friend FORCEINLINE constexpr bool operator==(const TCountedIterator& LHS, const TCountedIterator<J>& RHS) { return LHS.GetBase() == RHS.GetBase(); }
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template <CInputOrOutputIterator J> requires (CSizedSentinelFor<J, IteratorType>)
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NODISCARD friend FORCEINLINE constexpr TCompareThreeWayResult<IteratorType, J> operator<=>(const TCountedIterator& LHS, const TCountedIterator<J>& RHS) { return LHS.GetBase() <=> RHS.GetBase(); }
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NODISCARD FORCEINLINE constexpr bool operator==(FDefaultSentinel) const& { return Length == static_cast<ptrdiff>(0); }
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NODISCARD FORCEINLINE constexpr strong_ordering operator<=>(FDefaultSentinel) const& { return static_cast<ptrdiff>(0) <=> Length; }
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NODISCARD FORCEINLINE constexpr decltype(auto) operator*() const { CheckThis(true); return *Current; }
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NODISCARD FORCEINLINE constexpr decltype(auto) operator->() const { CheckThis(true); return AddressOf(operator*()); }
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NODISCARD FORCEINLINE constexpr decltype(auto) operator[](ptrdiff Index) const requires (CRandomAccessIterator<IteratorType>) { TCountedIterator Temp = *this + Index; return *Temp; }
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FORCEINLINE constexpr TCountedIterator& operator++() { ++Current; --Length; CheckThis(); return *this; }
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FORCEINLINE constexpr TCountedIterator& operator--() requires (CBidirectionalIterator<IteratorType>) { --Current; ++Length; CheckThis(); return *this; }
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FORCEINLINE constexpr decltype(auto) operator++(int) { --Length; CheckThis(); return Current++; }
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FORCEINLINE constexpr TCountedIterator operator++(int) requires (CForwardIterator<IteratorType>) { TCountedIterator Temp = *this; ++Current; --Length; CheckThis(); return Temp; }
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FORCEINLINE constexpr TCountedIterator operator--(int) requires (CBidirectionalIterator<IteratorType>) { TCountedIterator Temp = *this; --Current; ++Length; CheckThis(); return Temp; }
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FORCEINLINE constexpr TCountedIterator& operator+=(ptrdiff Offset) requires (CRandomAccessIterator<IteratorType>) { Current += Offset; Length -= Offset; CheckThis(); return *this; }
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FORCEINLINE constexpr TCountedIterator& operator-=(ptrdiff Offset) requires (CRandomAccessIterator<IteratorType>) { Current -= Offset; Length += Offset; CheckThis(); return *this; }
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NODISCARD friend FORCEINLINE constexpr TCountedIterator operator+(TCountedIterator Iter, ptrdiff Offset) requires (CRandomAccessIterator<IteratorType>) { TCountedIterator Temp = Iter; Temp += Offset; return Temp; }
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NODISCARD friend FORCEINLINE constexpr TCountedIterator operator+(ptrdiff Offset, TCountedIterator Iter) requires (CRandomAccessIterator<IteratorType>) { TCountedIterator Temp = Iter; Temp += Offset; return Temp; }
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NODISCARD FORCEINLINE constexpr TCountedIterator operator-(ptrdiff Offset) const requires (CRandomAccessIterator<IteratorType>) { TCountedIterator Temp = *this; Temp -= Offset; return Temp; }
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NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(const TCountedIterator& LHS, const TCountedIterator& RHS) { LHS.CheckThis(); RHS.CheckThis(); return LHS.GetBase() - RHS.GetBase(); }
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NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(const TCountedIterator& LHS, FDefaultSentinel) { CheckThis(); return -LHS.Num(); }
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NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(FDefaultSentinel, const TCountedIterator& RHS) { CheckThis(); return RHS.Num(); }
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NODISCARD FORCEINLINE constexpr explicit operator ElementType*() requires (CContiguousIterator<IteratorType> && !CConst<ElementType>) { CheckThis(); return Current; }
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NODISCARD FORCEINLINE constexpr explicit operator const ElementType*() const requires (CContiguousIterator<IteratorType>) { CheckThis(); return Current; }
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NODISCARD FORCEINLINE constexpr IteratorType GetBase() const { CheckThis(); return Current; }
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NODISCARD FORCEINLINE constexpr ptrdiff Num() const { CheckThis(); return Length; }
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private:
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IteratorType Current;
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ptrdiff Length;
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# if DO_CHECK
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ptrdiff MaxLength;
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# endif
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FORCEINLINE void CheckThis(bool bExceptEnd = false) const
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{
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checkf(static_cast<ptrdiff>(0) <= Length && Length <= MaxLength, TEXT("Read access violation. Please check Num()."));
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checkf(!(bExceptEnd && Length == static_cast<ptrdiff>(0)), TEXT("Read access violation. Please check Num()."));
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}
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template <CInputOrOutputIterator J>
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friend class TCountedIterator;
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};
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static_assert(CContiguousIterator<TCountedIterator<int32*>>);
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static_assert(CSizedSentinelFor<FDefaultSentinel, TCountedIterator<int32*>>);
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NAMESPACE_BEGIN(Iteration)
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/** Increments given iterator 'Iter' by 'N' elements. */
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@ -415,16 +519,16 @@ FORCEINLINE constexpr decltype(auto) RBegin(T&& Container)
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}
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/** Overloads the RBegin algorithm for arrays. */
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template <typename T, size_t N> FORCEINLINE constexpr decltype(auto) RBegin( T(& Container)[N]) { return MakeReverseIterator(End(Container)); }
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template <typename T, size_t N> FORCEINLINE constexpr decltype(auto) RBegin( T(&& Container)[N]) { return MakeReverseIterator(End(Container)); }
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template <typename T, size_t N> FORCEINLINE constexpr decltype(auto) RBegin(const T(& Container)[N]) { return MakeReverseIterator(End(Container)); }
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template <typename T, size_t N> FORCEINLINE constexpr decltype(auto) RBegin(const T(&& Container)[N]) { return MakeReverseIterator(End(Container)); }
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template <typename T, size_t N> FORCEINLINE constexpr decltype(auto) RBegin( T(& Container)[N]) { return TReverseIterator(End(Container)); }
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template <typename T, size_t N> FORCEINLINE constexpr decltype(auto) RBegin( T(&& Container)[N]) { return TReverseIterator(End(Container)); }
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template <typename T, size_t N> FORCEINLINE constexpr decltype(auto) RBegin(const T(& Container)[N]) { return TReverseIterator(End(Container)); }
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template <typename T, size_t N> FORCEINLINE constexpr decltype(auto) RBegin(const T(&& Container)[N]) { return TReverseIterator(End(Container)); }
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/** Overloads the RBegin algorithm for T::rbegin(). */
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template <typename T>
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FORCEINLINE constexpr decltype(auto) RBegin(initializer_list<T> Container)
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{
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return MakeReverseIterator(Container.end());
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return TReverseIterator(Container.end());
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}
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/** @return The reverse iterator to the end of a container. */
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@ -435,16 +539,16 @@ FORCEINLINE constexpr decltype(auto) REnd(T&& Container)
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}
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/** Overloads the REnd algorithm for arrays. */
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template <typename T, size_t N> FORCEINLINE constexpr decltype(auto) REnd( T(& Container)[N]) { return MakeReverseIterator(Begin(Container)); }
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template <typename T, size_t N> FORCEINLINE constexpr decltype(auto) REnd( T(&& Container)[N]) { return MakeReverseIterator(Begin(Container)); }
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template <typename T, size_t N> FORCEINLINE constexpr decltype(auto) REnd(const T(& Container)[N]) { return MakeReverseIterator(Begin(Container)); }
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template <typename T, size_t N> FORCEINLINE constexpr decltype(auto) REnd(const T(&& Container)[N]) { return MakeReverseIterator(Begin(Container)); }
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template <typename T, size_t N> FORCEINLINE constexpr decltype(auto) REnd( T(& Container)[N]) { return TReverseIterator(Begin(Container)); }
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template <typename T, size_t N> FORCEINLINE constexpr decltype(auto) REnd( T(&& Container)[N]) { return TReverseIterator(Begin(Container)); }
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template <typename T, size_t N> FORCEINLINE constexpr decltype(auto) REnd(const T(& Container)[N]) { return TReverseIterator(Begin(Container)); }
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template <typename T, size_t N> FORCEINLINE constexpr decltype(auto) REnd(const T(&& Container)[N]) { return TReverseIterator(Begin(Container)); }
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/** Overloads the REnd algorithm for T::end(). */
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template <typename T>
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FORCEINLINE constexpr decltype(auto) REnd(initializer_list<T> Container)
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{
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return MakeReverseIterator(Container.begin());
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return TReverseIterator(Container.begin());
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}
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NAMESPACE_END(Iteration)
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