Redcraft/Redcraft.Utility/Source/Public/Containers/StaticArray.h

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#pragma once
#include "CoreTypes.h"
#include "Templates/Meta.h"
#include "Templates/Utility.h"
#include "Templates/TypeHash.h"
#include "Templates/Container.h"
#include "Containers/Iterator.h"
#include "Containers/ArrayView.h"
#include "TypeTraits/TypeTraits.h"
#include "Miscellaneous/Compare.h"
#include "Memory/ObserverPointer.h"
#include "Miscellaneous/AssertionMacros.h"
NAMESPACE_REDCRAFT_BEGIN
NAMESPACE_MODULE_BEGIN(Redcraft)
NAMESPACE_MODULE_BEGIN(Utility)
/** TStaticArray is a container that encapsulates fixed size arrays. */
template <CObject T, size_t N>
struct TStaticArray final
{
private:
template <bool bConst>
class IteratorImpl;
public:
using ElementType = T;
using Reference = T&;
using ConstReference = const T&;
using Iterator = IteratorImpl<false>;
using ConstIterator = IteratorImpl<true >;
using ReverseIterator = TReverseIterator< Iterator>;
using ConstReverseIterator = TReverseIterator<ConstIterator>;
static_assert(CContiguousIterator< Iterator>);
static_assert(CContiguousIterator<ConstIterator>);
/** Compares the contents of two arrays. */
NODISCARD friend constexpr bool operator==(const TStaticArray& LHS, const TStaticArray& RHS) requires (CWeaklyEqualityComparable<ElementType>)
{
if (LHS.Num() != RHS.Num()) return false;
ConstIterator LHSIter = LHS.Begin();
ConstIterator RHSIter = RHS.Begin();
while (LHSIter != LHS.End())
{
if (*LHSIter != *RHSIter) return false;
++LHSIter;
++RHSIter;
}
check(RHSIter == RHS.End());
return true;
}
/** Compares the contents of 'LHS' and 'RHS' lexicographically. */
NODISCARD friend constexpr auto operator<=>(const TStaticArray& LHS, const TStaticArray& RHS) requires (CSynthThreeWayComparable<ElementType>)
{
using OrderingType = TSynthThreeWayResult<ElementType>;
ConstIterator LHSIter = LHS.Begin();
ConstIterator RHSIter = RHS.Begin();
while (LHSIter != LHS.End() || RHSIter != RHS.End())
{
TSynthThreeWayResult<ElementType> Ordering = SynthThreeWayCompare(*LHSIter, *RHSIter);
if (Ordering != OrderingType::equivalent) return Ordering;
++LHSIter;
++RHSIter;
}
return LHS.Num() <=> RHS.Num();
}
/** @return The pointer to the underlying element storage. */
NODISCARD FORCEINLINE constexpr TObserverPtr< ElementType[]> GetData() { return TObserverPtr< ElementType[]>(_); }
NODISCARD FORCEINLINE constexpr TObserverPtr<const ElementType[]> GetData() const { return TObserverPtr<const ElementType[]>(_); }
/** @return The iterator to the first or end element. */
NODISCARD FORCEINLINE constexpr Iterator Begin() { return Iterator(this, _); }
NODISCARD FORCEINLINE constexpr ConstIterator Begin() const { return ConstIterator(this, _); }
NODISCARD FORCEINLINE constexpr Iterator End() { return Iterator(this, _ + Num()); }
NODISCARD FORCEINLINE constexpr ConstIterator End() const { return ConstIterator(this, _ + Num()); }
/** @return The reverse iterator to the first or end element. */
NODISCARD FORCEINLINE constexpr ReverseIterator RBegin() { return ReverseIterator(End()); }
NODISCARD FORCEINLINE constexpr ConstReverseIterator RBegin() const { return ConstReverseIterator(End()); }
NODISCARD FORCEINLINE constexpr ReverseIterator REnd() { return ReverseIterator(Begin()); }
NODISCARD FORCEINLINE constexpr ConstReverseIterator REnd() const { return ConstReverseIterator(Begin()); }
/** @return The number of elements in the container. */
NODISCARD FORCEINLINE constexpr size_t Num() const { return N; }
/** @return true if the container is empty, false otherwise. */
NODISCARD FORCEINLINE constexpr bool IsEmpty() const { return Num() == 0; }
/** @return true if the iterator is valid, false otherwise. */
NODISCARD FORCEINLINE constexpr bool IsValidIterator(ConstIterator Iter) const { return Begin() <= Iter && Iter <= End(); }
/** @return The reference to the requested element. */
NODISCARD FORCEINLINE constexpr ElementType& operator[](size_t Index) { checkf(Index < Num(), TEXT("Read access violation. Please check IsValidIterator().")); return _[Index]; }
NODISCARD FORCEINLINE constexpr const ElementType& operator[](size_t Index) const { checkf(Index < Num(), TEXT("Read access violation. Please check IsValidIterator().")); return _[Index]; }
/** @return The reference to the first or last element. */
NODISCARD FORCEINLINE constexpr ElementType& Front() { return *Begin(); }
NODISCARD FORCEINLINE constexpr const ElementType& Front() const { return *Begin(); }
NODISCARD FORCEINLINE constexpr ElementType& Back() { return *(End() - 1); }
NODISCARD FORCEINLINE constexpr const ElementType& Back() const { return *(End() - 1); }
/** Overloads the GetTypeHash algorithm for TStaticArray. */
NODISCARD friend FORCEINLINE constexpr size_t GetTypeHash(const TStaticArray& A) requires (CHashable<ElementType>)
{
size_t Result = 0;
for (ConstIterator Iter = A.Begin(); Iter != A.End(); ++Iter)
{
Result = HashCombine(Result, GetTypeHash(*Iter));
}
return Result;
}
/** Overloads the Swap algorithm for TStaticArray. */
friend FORCEINLINE constexpr void Swap(TStaticArray& A, TStaticArray& B) requires (CSwappable<ElementType>) { Swap(A._, B._); }
ENABLE_RANGE_BASED_FOR_LOOP_SUPPORT
T _[N];
private:
template <bool bConst>
class IteratorImpl
{
public:
using ElementType = TConditional<bConst, const T, T>;
FORCEINLINE constexpr IteratorImpl() = default;
# if DO_CHECK
FORCEINLINE IteratorImpl(const IteratorImpl<false>& InValue) requires (bConst)
: Owner(InValue.Owner), Pointer(InValue.Pointer)
{ }
# else
FORCEINLINE IteratorImpl(const IteratorImpl<false>& InValue) requires (bConst)
: Pointer(InValue.Pointer)
{ }
# endif
FORCEINLINE constexpr IteratorImpl(const IteratorImpl&) = default;
FORCEINLINE constexpr IteratorImpl(IteratorImpl&&) = default;
FORCEINLINE constexpr IteratorImpl& operator=(const IteratorImpl&) = default;
FORCEINLINE constexpr IteratorImpl& operator=(IteratorImpl&&) = default;
NODISCARD friend FORCEINLINE constexpr bool operator==(const IteratorImpl& LHS, const IteratorImpl& RHS) { return LHS.Pointer == RHS.Pointer; }
NODISCARD friend FORCEINLINE constexpr strong_ordering operator<=>(const IteratorImpl& LHS, const IteratorImpl& RHS) { return LHS.Pointer <=> RHS.Pointer; }
NODISCARD FORCEINLINE constexpr ElementType& operator*() const { CheckThis(true); return *Pointer; }
NODISCARD FORCEINLINE constexpr ElementType* operator->() const { CheckThis(true); return Pointer; }
NODISCARD FORCEINLINE constexpr ElementType& operator[](ptrdiff Index) const { IteratorImpl Temp = *this + Index; return *Temp; }
FORCEINLINE constexpr IteratorImpl& operator++() { ++Pointer; CheckThis(); return *this; }
FORCEINLINE constexpr IteratorImpl& operator--() { --Pointer; CheckThis(); return *this; }
FORCEINLINE constexpr IteratorImpl operator++(int) { IteratorImpl Temp = *this; ++*this; return Temp; }
FORCEINLINE constexpr IteratorImpl operator--(int) { IteratorImpl Temp = *this; --*this; return Temp; }
FORCEINLINE constexpr IteratorImpl& operator+=(ptrdiff Offset) { Pointer += Offset; CheckThis(); return *this; }
FORCEINLINE constexpr IteratorImpl& operator-=(ptrdiff Offset) { Pointer -= Offset; CheckThis(); return *this; }
NODISCARD friend FORCEINLINE constexpr IteratorImpl operator+(IteratorImpl Iter, ptrdiff Offset) { IteratorImpl Temp = Iter; Temp += Offset; return Temp; }
NODISCARD friend FORCEINLINE constexpr IteratorImpl operator+(ptrdiff Offset, IteratorImpl Iter) { IteratorImpl Temp = Iter; Temp += Offset; return Temp; }
NODISCARD FORCEINLINE constexpr IteratorImpl operator-(ptrdiff Offset) const { IteratorImpl Temp = *this; Temp -= Offset; return Temp; }
NODISCARD friend FORCEINLINE constexpr ptrdiff operator-(const IteratorImpl& LHS, const IteratorImpl& RHS) { LHS.CheckThis(); RHS.CheckThis(); return LHS.Pointer - RHS.Pointer; }
NODISCARD FORCEINLINE constexpr explicit operator TObserverPtr<ElementType[]>() const { CheckThis(); return TObserverPtr<ElementType[]>(Pointer); }
private:
# if DO_CHECK
const TStaticArray* Owner = nullptr;
# endif
ElementType* Pointer = nullptr;
# if DO_CHECK
FORCEINLINE constexpr IteratorImpl(const TStaticArray* InContainer, ElementType* InPointer)
: Owner(InContainer), Pointer(InPointer)
{ }
# else
FORCEINLINE constexpr IteratorImpl(const TStaticArray* InContainer, ElementType* InPointer)
: Pointer(InPointer)
{ }
# endif
FORCEINLINE constexpr void CheckThis(bool bExceptEnd = false) const
{
checkf(Owner && Owner->IsValidIterator(*this), TEXT("Read access violation. Please check IsValidIterator()."));
checkf(!(bExceptEnd && Owner->End() == *this), TEXT("Read access violation. Please check IsValidIterator()."));
}
template <bool> friend class IteratorImpl;
friend TStaticArray;
};
};
template <typename T, typename... U> requires (true && ... && CSameAs<T, U>)
TStaticArray(T, U...) -> TStaticArray<T, 1 + sizeof...(U)>;
/** Creates a TStaticArray object from a built-in array. */
template <typename T, size_t N>
constexpr TStaticArray<TRemoveCV<T>, N> ToArray(T(& Array)[N])
{
return [&Array]<size_t... Indices>(TIndexSequence<Indices...>) -> TStaticArray<TRemoveCV<T>, N> { return { Array[Indices]... }; } (TMakeIndexSequence<N>());
}
/** Creates a TStaticArray object from a built-in array. */
template <typename T, size_t N>
constexpr TStaticArray<TRemoveCV<T>, N> ToArray(T(&& Array)[N])
{
return [&Array]<size_t... Indices>(TIndexSequence<Indices...>) -> TStaticArray<TRemoveCV<T>, N> { return { MoveTemp(Array[Indices])... }; } (TMakeIndexSequence<N>());
}
NAMESPACE_MODULE_END(Utility)
NAMESPACE_MODULE_END(Redcraft)
NAMESPACE_REDCRAFT_END
NAMESPACE_STD_BEGIN
// Support structure binding, should not be directly used.
template <typename T, size_t N> struct tuple_size<NAMESPACE_REDCRAFT::TStaticArray<T, N>> : integral_constant<size_t, N> { };
template <size_t I, typename T, size_t N> struct tuple_element<I, NAMESPACE_REDCRAFT::TStaticArray<T, N>> { using type = T; };
NAMESPACE_STD_END
NAMESPACE_REDCRAFT_BEGIN
NAMESPACE_MODULE_BEGIN(Redcraft)
NAMESPACE_MODULE_BEGIN(Utility)
// Support structure binding, should not be directly used.
template <size_t Index, typename T, size_t N> FORCEINLINE constexpr decltype(auto) get( TStaticArray<T, N>& InValue) { return static_cast< TStaticArray<T, N>& >(InValue)[Index]; }
template <size_t Index, typename T, size_t N> FORCEINLINE constexpr decltype(auto) get(const TStaticArray<T, N>& InValue) { return static_cast<const TStaticArray<T, N>& >(InValue)[Index]; }
template <size_t Index, typename T, size_t N> FORCEINLINE constexpr decltype(auto) get( TStaticArray<T, N>&& InValue) { return static_cast< TStaticArray<T, N>&&>(InValue)[Index]; }
template <size_t Index, typename T, size_t N> FORCEINLINE constexpr decltype(auto) get(const TStaticArray<T, N>&& InValue) { return static_cast<const TStaticArray<T, N>&&>(InValue)[Index]; }
NAMESPACE_MODULE_END(Utility)
NAMESPACE_MODULE_END(Redcraft)
NAMESPACE_REDCRAFT_END