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feat(algorithms): add more iterator algorithm and the corresponding testing

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Redstone1024
2024-12-21 21:35:59 +08:00
parent a68a6d16b6
commit 04bb4be901
2 changed files with 205 additions and 13 deletions
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112
Redcraft.Utility/Source/Public/Algorithms/Basic.h
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@ -6,6 +6,7 @@
#include "Iterators/Sentinel.h"
#include "Iterators/BasicIterator.h"
#include "Ranges/Utility.h"
#include "Numerics/Math.h"
#include "Miscellaneous/AssertionMacros.h"
NAMESPACE_REDCRAFT_BEGIN
@ -15,7 +16,7 @@ NAMESPACE_MODULE_BEGIN(Utility)
NAMESPACE_BEGIN(Algorithms)
/** Increments given iterator 'Iter' by 'N' elements. */
template <CInputIterator I>
template <CInputOrOutputIterator I>
FORCEINLINE constexpr void Advance(I& Iter, ptrdiff N)
{
if constexpr (CRandomAccessIterator<I>)
@ -32,22 +33,84 @@ FORCEINLINE constexpr void Advance(I& Iter, ptrdiff N)
else
{
checkf(N >= 0, TEXT("The iterator must satisfy the CBidirectionalIterator in order to be decremented."));
for (; N > 0; --N) ++Iter;
}
}
/** Increments given iterator 'Iter' to the 'Sent' position. */
template <CInputOrOutputIterator I, CSentinelFor<I> S>
FORCEINLINE constexpr void Advance(I& Iter, S Sent)
{
if constexpr (CAssignableFrom<I&, S>)
{
Iter = Sent;
}
else if constexpr (CSizedSentinelFor<S, I>)
{
Algorithms::Advance(Iter, Sent - Iter);
}
else
{
for (; Iter != Sent; ++Iter);
}
}
/** Increments given iterator 'Iter' by 'N' elements, up to the 'Sent' position. */
template <CInputOrOutputIterator I, CSentinelFor<I> S>
FORCEINLINE constexpr ptrdiff Advance(I& Iter, ptrdiff N, S Sent)
{
if constexpr (CSizedSentinelFor<S, I>)
{
const ptrdiff Distance = Sent - Iter;
if (Math::Abs(N) > Math::Abs(Distance))
{
Algorithms::Advance(Iter, Sent);
return N - Distance;
}
Algorithms::Advance(Iter, N);
return 0;
}
else if constexpr (CBidirectionalIterator<I>)
{
for (; N > 0 && Iter != Sent; --N) ++Iter;
for (; N < 0 && Iter != Sent; ++N) --Iter;
return N;
}
else
{
checkf(N >= 0, TEXT("The iterator must satisfy the CBidirectionalIterator in order to be decremented."));
for (; N > 0 && Iter != Sent; --N) ++Iter;
return N;
}
}
/** @return The number of hops from 'First' to 'Last'. */
template <CInputIterator I, CSentinelFor<I> S>
template <CInputOrOutputIterator I, CSentinelFor<I> S>
NODISCARD FORCEINLINE constexpr ptrdiff Distance(I First, S Last)
{
if constexpr (CSizedSentinelFor<S, I>)
{
return Last - First;
}
else
{
ptrdiff Result = 0;
for (; First != Last; ++First) ++Result;
return Result;
}
}
@ -60,25 +123,64 @@ NODISCARD FORCEINLINE constexpr ptrdiff Distance(R&& Range)
{
return static_cast<ptrdiff>(Ranges::Num(Range));
}
else return Algorithms::Distance(Ranges::Begin(Range), Ranges::End(Range));
}
/** @return The 1-th successor of iterator 'Iter'. */
template <CInputOrOutputIterator I>
NODISCARD FORCEINLINE constexpr I Next(I Iter)
{
return ++Iter;
}
/** @return The 'N'-th successor of iterator 'Iter'. */
template <CInputIterator I>
NODISCARD FORCEINLINE constexpr I Next(I Iter, ptrdiff N = 1)
template <CInputOrOutputIterator I>
NODISCARD FORCEINLINE constexpr I Next(I Iter, ptrdiff N)
{
Algorithms::Advance(Iter, N);
return Iter;
}
/** @return The successor of iterator 'Iter' to the 'Sent' position. */
template <CInputOrOutputIterator I, CSentinelFor<I> S>
NODISCARD FORCEINLINE constexpr I Next(I Iter, S Sent)
{
Algorithms::Advance(Iter, Sent);
return Iter;
}
/** @return The 'N'-th successor of iterator 'Iter', up to the 'Sent' position. */
template <CInputOrOutputIterator I, CSentinelFor<I> S>
NODISCARD FORCEINLINE constexpr I Next(I Iter, ptrdiff N, S Sent)
{
Algorithms::Advance(Iter, N, Sent);
return Iter;
}
/** @return The 1-th predecessor of iterator 'Iter'. */
template <CBidirectionalIterator I>
NODISCARD FORCEINLINE constexpr I Prev(I Iter)
{
return --Iter;
}
/** @return The 'N'-th predecessor of iterator 'Iter'. */
template <CBidirectionalIterator I>
NODISCARD FORCEINLINE constexpr I Prev(I Iter, ptrdiff N = 1)
NODISCARD FORCEINLINE constexpr I Prev(I Iter, ptrdiff N)
{
Algorithms::Advance(Iter, -N);
return Iter;
}
/** @return The predecessor of iterator 'Iter', up to the 'First' position. */
template <CBidirectionalIterator I>
NODISCARD FORCEINLINE constexpr I Prev(I Iter, ptrdiff N, I First)
{
Algorithms::Advance(Iter, -N, First);
return Iter;
}
NAMESPACE_END(Algorithms)
NAMESPACE_MODULE_END(Utility)