76 lines
2.4 KiB
C++
76 lines
2.4 KiB
C++
#pragma once
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#include "CoreTypes.h"
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#include "Iterator/Utility.h"
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#include "Iterator/Sentinel.h"
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#include "Iterator/ForwardIterator.h"
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#include "TypeTraits/TypeTraits.h"
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NAMESPACE_REDCRAFT_BEGIN
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NAMESPACE_MODULE_BEGIN(Redcraft)
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NAMESPACE_MODULE_BEGIN(Utility)
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#if PLATFORM_COMPILER_GCC
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# pragma GCC diagnostic push
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# pragma GCC diagnostic ignored "-Wnon-template-friend"
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#endif
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/** A concept specifies a type is a bidirectional iterator. Add the decrement operator to the forward iterator. */
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template <typename I>
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concept CBidirectionalIterator = CForwardIterator<I>
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&& requires(I Iter) {
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{ --Iter } -> CSameAs<I&>;
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{ Iter-- } -> CSameAs<I >;
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};
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/**
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* This is an example of a bidirectional iterator, indicate the traits that define a bidirectional iterator.
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* Regardless of the order in which the increment and decrement operators are applied,
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* the result is always the same if both operations are performed the same number of times.
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*/
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template <CReference T>
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struct IBidirectionalIterator /* : IForwardIterator<T> */
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{
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/** The element type of the indirectly readable type. See 'IIndirectlyReadable'. */
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using ElementType = TRemoveCVRef<T>;
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/** Default constructor. See 'IIncrementable' and 'ISentinelFor'. */
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IBidirectionalIterator();
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/** Copy constructor. See 'IIncrementable' and 'ISentinelFor'. */
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IBidirectionalIterator(const IBidirectionalIterator&);
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/** Copy assignment operator. See 'IIncrementable' and 'ISentinelFor'. */
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IBidirectionalIterator* operator=(const IBidirectionalIterator&);
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/** Equality operator. See 'IIncrementable' and 'ISentinelFor'. */
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friend bool operator==(const IBidirectionalIterator&, const IBidirectionalIterator&);
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/** Dereference operator. See 'IForwardIterator'. */
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T operator*() const;
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/** Pre-increment operator. See 'IWeaklyIncrementable'. */
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IBidirectionalIterator& operator++();
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/** Pre-decrement operator. */
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IBidirectionalIterator& operator--();
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/** Post-increment operator. See 'IIncrementable'. */
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IBidirectionalIterator operator++(int);
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/** Post-decrement operator. */
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IBidirectionalIterator operator--(int);
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};
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// Use 'IBidirectionalIterator<int>' represents a bidirectional iterator.
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static_assert(CBidirectionalIterator<IBidirectionalIterator<int&>>);
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static_assert( COutputIterator<IBidirectionalIterator<int&>, int>);
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#if PLATFORM_COMPILER_GCC
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# pragma GCC diagnostic pop
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#endif
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NAMESPACE_MODULE_END(Utility)
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NAMESPACE_MODULE_END(Redcraft)
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NAMESPACE_REDCRAFT_END
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