SortedCollection_SkipList.inl

/*
 * Copyright(c) Sophist Solutions, Inc. 1990-2026.  All rights reserved
 */
#include "Stroika/Foundation/Containers/DataStructures/SkipList.h"
#include "Stroika/Foundation/Containers/Private/IteratorImplHelper.h"
#include "Stroika/Foundation/Debug/Cast.h"
#include "Stroika/Foundation/Memory/BlockAllocated.h"
 
namespace Stroika::Foundation::Containers::Concrete {
 
    /*
     ********************************************************************************
     *********************** SortedCollection_SkipList<T>::Rep_ *********************
     ********************************************************************************
     */
    template <typename T>
    template <qCompilerAndStdLib_ConstraintDiffersInTemplateRedeclaration_BWA (Common::IThreeWayComparer<T>) COMPARER>
    class SortedCollection_SkipList<T>::Rep_ : public Private::SkipListBasedContainerRepImpl<Rep_<COMPARER>, IImplRepBase_>,
                                               public Memory::UseBlockAllocationIfAppropriate<Rep_<COMPARER>> {
    private:
        using inherited = Private::SkipListBasedContainerRepImpl<Rep_<COMPARER>, IImplRepBase_>;
 
    public:
        static_assert (not is_reference_v<COMPARER>);
 
    public:
        Rep_ (const COMPARER& comparer)
            : fData_{comparer}
        {
        }
        Rep_ (const Rep_& from) = default;
 
    public:
        nonvirtual Rep_& operator= (const Rep_&) = delete;
 
        // Iterable<T>::_IRep overrides
    public:
        virtual shared_ptr<typename Iterable<T>::_IRep> Clone () const override
        {
            Debug::AssertExternallySynchronizedChecker::ReadContext declareContext{fData_};
            return Memory::MakeSharedPtr<Rep_> (*this);
        }
        virtual Iterator<value_type> MakeIterator () const override
        {
            Debug::AssertExternallySynchronizedChecker::ReadContext declareContext{fData_};
            return Iterator<value_type>{make_unique<IteratorRep_> (&fData_, &fChangeCounts_)};
        }
        virtual size_t size () const override
        {
            Debug::AssertExternallySynchronizedChecker::ReadContext declareContext{fData_};
            return fData_.size ();
        }
        virtual bool empty () const override
        {
            Debug::AssertExternallySynchronizedChecker::ReadContext declareContext{fData_};
            return fData_.empty ();
        }
        virtual void Apply (const function<void (ArgByValueType<value_type> item)>& doToElement, [[maybe_unused]] Execution::SequencePolicy seq) const override
        {
            Debug::AssertExternallySynchronizedChecker::ReadContext declareContext{fData_};
            fData_.Apply ([&] (auto arg) { doToElement (arg.fKey); });
        }
        virtual Iterator<value_type> Find ([[maybe_unused]] bool findFirst, const function<bool (ArgByValueType<value_type> item)>& that,
                                           [[maybe_unused]] Execution::SequencePolicy seq) const override
        {
            Debug::AssertExternallySynchronizedChecker::ReadContext declareContext{fData_};
            if (auto iLink = fData_.Find ([&] (auto arg) { return that (arg.fKey); })) {
                return Iterator<value_type>{make_unique<IteratorRep_> (&fChangeCounts_, iLink)};
            }
            return nullptr;
        }
 
        // Collection<T>::_IRep overrides
    public:
        virtual shared_ptr<typename Collection<T>::_IRep> CloneEmpty () const override
        {
            Debug::AssertExternallySynchronizedChecker::ReadContext declareContext{fData_};
            return Memory::MakeSharedPtr<Rep_> (fData_.key_comp ()); // keep comparer, but lose data in clone
        }
        virtual shared_ptr<typename Collection<T>::_IRep> CloneAndPatchIterator (Iterator<T>* i) const override
        {
            RequireNotNull (i);
            Debug::AssertExternallySynchronizedChecker::ReadContext declareContext{fData_};
            auto                                                    result = Memory::MakeSharedPtr<Rep_> (*this);
            auto& mir = Debug::UncheckedDynamicCast<const IteratorRep_&> (i->ConstGetRep ());
            result->fData_.MoveIteratorHereAfterClone (&mir.fIterator, &fData_);
            i->Refresh (); // reflect updated rep
            return result;
        }
#if qCompilerAndStdLib_MemoryInsertAt_Buggy
        // see the note on qCompilerAndStdLib_MemoryInsertAt_Buggy - without this, g++ <= 14 drops
        // the `if (oAddedI != nullptr)` guard below and writes through the null pointer
        [[gnu::noinline, gnu::optimize ("O0")]]
#endif
        virtual void Add (const span<const value_type>& items, Iterator<value_type>* oAddedI) override
        {
            Require (not items.empty ());
            Require (oAddedI == nullptr or items.size () == 1);
            Debug::AssertExternallySynchronizedChecker::WriteContext declareContext{fData_};
            if (oAddedI == nullptr) [[likely]] {
                for (const value_type& i : items) {
                    fData_.Add (i); // skiplist insert; no bulk form
                }
                fChangeCounts_.PerformedChange ();
            }
            else {
                typename DataStructureImplType_::ForwardIterator retIt;
                fData_.Add (items[0], &retIt);
                fChangeCounts_.PerformedChange ();
                *oAddedI = Iterator<value_type>{make_unique<IteratorRep_> (&fChangeCounts_, retIt)};
            }
        }
        virtual void Update (const Iterator<value_type>& i, ArgByValueType<value_type> newValue, Iterator<value_type>* nextI) override
        {
            Debug::AssertExternallySynchronizedChecker::WriteContext declareWriteContext{fData_};
            auto& mir = Debug::UncheckedDynamicCast<const IteratorRep_&> (i.ConstGetRep ());
            fData_.Remove (mir.fIterator);
            if (nextI == nullptr) {
                fData_.Add (newValue);
                fChangeCounts_.PerformedChange ();
            }
            else {
                typename DataStructureImplType_::ForwardIterator retIt;
                fData_.Add (newValue, &retIt);
                fChangeCounts_.PerformedChange ();
                *nextI = Iterator<value_type>{make_unique<IteratorRep_> (&fChangeCounts_, retIt)};
            }
        }
        virtual void Remove (const Iterator<value_type>& i, Iterator<value_type>* nextI) override
        {
            Debug::AssertExternallySynchronizedChecker::WriteContext declareContext{fData_};
            auto& mir = Debug::UncheckedDynamicCast<const IteratorRep_&> (i.ConstGetRep ());
            if (nextI == nullptr) [[likely]] {
                fData_.Remove (mir.fIterator);
                fChangeCounts_.PerformedChange ();
            }
            else {
                auto ret = fData_.erase (mir.fIterator);
                fChangeCounts_.PerformedChange ();
                *nextI = Iterator<value_type>{make_unique<IteratorRep_> (&fChangeCounts_, ret)};
            }
        }
 
        // SortedCollection<T>::_IRep overrides
    public:
        virtual ElementThreeWayComparerType GetElementThreeWayComparer () const override
        {
            Debug::AssertExternallySynchronizedChecker::ReadContext declareContext{fData_};
            return fData_.key_comp ();
        }
        virtual bool Contains (ArgByValueType<value_type> item) const override
        {
            Debug::AssertExternallySynchronizedChecker::ReadContext declareContext{fData_};
            return not fData_.Find (item).AtEnd ();
        }
        virtual void Remove (ArgByValueType<value_type> item) override
        {
            Debug::AssertExternallySynchronizedChecker::WriteContext declareContext{fData_};
            fData_.Remove (item);
            fChangeCounts_.PerformedChange ();
        }
 
    private:
        using DataStructureImplType_ = SKIPLIST<COMPARER>;
        struct IterTraits_ : Private::IteratorImplHelper_DefaultTraits<value_type, DataStructureImplType_> {
            static constexpr value_type ConvertDataStructureIterationResult2ContainerIteratorResult (const typename DataStructureImplType_::value_type& t)
            {
                return t.fKey;
            }
        };
        using IteratorRep_ = Private::IteratorImplHelper_<value_type, DataStructureImplType_, IterTraits_>;
 
    private:
        DataStructureImplType_                       fData_;
        qStroika_ATTRIBUTE_NO_UNIQUE_ADDRESS_VCFORCE Private::ContainerDebugChangeCounts_ fChangeCounts_;
 
    private:
        friend inherited;
    };
 
    /*
     ********************************************************************************
     *********************** SortedCollection_SkipList<T> ***************************
     ********************************************************************************
     */
    template <typename T>
    inline SortedCollection_SkipList<T>::SortedCollection_SkipList ()
        : SortedCollection_SkipList{compare_three_way{}}
    {
        AssertRepValidType_ ();
    }
    template <typename T>
    template <IThreeWayComparer<T> COMPARER>
    inline SortedCollection_SkipList<T>::SortedCollection_SkipList (COMPARER&& inorderComparer)
        : inherited{Memory::MakeSharedPtr<Rep_<remove_cvref_t<COMPARER>>> (inorderComparer)}
    {
        AssertRepValidType_ ();
    }
    template <typename T>
    inline SortedCollection_SkipList<T>::SortedCollection_SkipList (const initializer_list<T>& src)
        : SortedCollection_SkipList{}
    {
        this->AddAll (src);
        AssertRepValidType_ ();
    }
    template <typename T>
    template <IThreeWayComparer<T> COMPARER>
    inline SortedCollection_SkipList<T>::SortedCollection_SkipList (COMPARER&& inOrderComparer, const initializer_list<T>& src)
        : SortedCollection_SkipList{forward<COMPARER> (inOrderComparer)}
    {
        this->AddAll (src);
        AssertRepValidType_ ();
    }
#if !qCompilerAndStdLib_RequiresNotMatchInlineOutOfLineForTemplateClassBeingDefined_Buggy
    template <typename T>
    template <IIterableOfTo<T> ITERABLE_OF_ADDABLE>
        requires (not derived_from<remove_cvref_t<ITERABLE_OF_ADDABLE>, SortedCollection_SkipList<T>>)
    inline SortedCollection_SkipList<T>::SortedCollection_SkipList (ITERABLE_OF_ADDABLE&& src)
        : SortedCollection_SkipList{}
    {
        this->AddAll (forward<ITERABLE_OF_ADDABLE> (src));
        AssertRepValidType_ ();
    }
#endif
    template <typename T>
    template <IThreeWayComparer<T> COMPARER, IIterableOfTo<T> ITERABLE_OF_ADDABLE>
    inline SortedCollection_SkipList<T>::SortedCollection_SkipList (COMPARER&& inOrderComparer, ITERABLE_OF_ADDABLE&& src)
        : SortedCollection_SkipList{forward<COMPARER> (inOrderComparer)}
    {
        this->AddAll (forward<ITERABLE_OF_ADDABLE> (src));
        AssertRepValidType_ ();
    }
    template <typename T>
    template <IInputIterator<T> ITERATOR_OF_ADDABLE>
    inline SortedCollection_SkipList<T>::SortedCollection_SkipList (ITERATOR_OF_ADDABLE&& start, ITERATOR_OF_ADDABLE&& end)
        : SortedCollection_SkipList{}
    {
        this->AddAll (forward<ITERATOR_OF_ADDABLE> (start), forward<ITERATOR_OF_ADDABLE> (end));
        AssertRepValidType_ ();
    }
    template <typename T>
    template <IThreeWayComparer<T> COMPARER, IInputIterator<T> ITERATOR_OF_ADDABLE>
    inline SortedCollection_SkipList<T>::SortedCollection_SkipList (COMPARER&& inOrderComparer, ITERATOR_OF_ADDABLE&& start, ITERATOR_OF_ADDABLE&& end)
        : SortedCollection_SkipList{forward<COMPARER> (inOrderComparer)}
    {
        this->AddAll (forward<ITERATOR_OF_ADDABLE> (start), forward<ITERATOR_OF_ADDABLE> (end));
        AssertRepValidType_ ();
    }
    template <typename T>
    inline void SortedCollection_SkipList<T>::AssertRepValidType_ () const
    {
        if constexpr (qStroika_Foundation_Debug_AssertionsChecked) {
            typename inherited::template _SafeReadRepAccessor<IImplRepBase_> tmp{this}; // for side-effect of AssertMember
        }
    }
 
}