Collection_Array.inl

/*
 * Copyright(c) Sophist Solutions, Inc. 1990-2026.  All rights reserved
 */
#include "Stroika/Foundation/Containers/DataStructures/Array.h"
#include "Stroika/Foundation/Containers/Private/ArraySupport.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 {
 
    /*
     ********************************************************************************
     ********************** Collection_Array<T,TRAITS>::Rep_ ************************
     ********************************************************************************
     */
    template <typename T>
    class Collection_Array<T>::Rep_ : public Collection_Array<T>::IImplRep_, public Memory::UseBlockAllocationIfAppropriate<Rep_> {
    private:
        using inherited = typename Collection<T>::_IRep;
 
    public:
        Rep_ ()                 = default;
        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_)};
        }
        // MakeIterator () walks fData_ from 0, so storage order IS iteration order.
        virtual optional<span<const value_type>> PeekContiguousStorage () const override
        {
            Debug::AssertExternallySynchronizedChecker::ReadContext declareContext{fData_};
            return span<const value_type>{fData_.data (), fData_.size ()};
        }
        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, Execution::SequencePolicy seq) const override
        {
            Debug::AssertExternallySynchronizedChecker::ReadContext declareContext{fData_};
            fData_.Apply (doToElement, seq);
        }
        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 i = fData_.Find (that)) {
                return Iterator<value_type>{make_unique<IteratorRep_> (&fChangeCounts_, i)};
            }
            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_> ();
        }
        virtual shared_ptr<typename Collection<T>::_IRep> CloneAndPatchIterator (Iterator<value_type>* 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_};
            // Appending is fastest, and Array::Insert () takes the whole span in one go
            fData_.Insert (fData_.size (), items);
            fChangeCounts_.PerformedChange ();
            if (oAddedI != nullptr) [[unlikely]] {
                *oAddedI = Iterator<value_type>{make_unique<IteratorRep_> (&fData_, &fChangeCounts_, fData_.size () - 1)};
            }
        }
        virtual void Update (const Iterator<value_type>& i, ArgByValueType<value_type> newValue, Iterator<value_type>* nextI) override
        {
            Debug::AssertExternallySynchronizedChecker::WriteContext         declareWriteContext{fData_};
            optional<typename DataStructureImplType_::UnderlyingIteratorRep> savedUnderlyingIndex;
            if (nextI != nullptr) {
                savedUnderlyingIndex = Debug::UncheckedDynamicCast<const IteratorRep_&> (i.ConstGetRep ()).fIterator.GetUnderlyingIteratorRep ();
            }
            fData_.SetAt (Debug::UncheckedDynamicCast<const IteratorRep_&> (i.ConstGetRep ()).fIterator, newValue);
            fChangeCounts_.PerformedChange ();
            if (nextI != nullptr) {
                *nextI = Iterator<value_type>{make_unique<IteratorRep_> (&fData_, &fChangeCounts_, *savedUnderlyingIndex)};
            }
        }
        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) {
                fData_.Remove (mir.fIterator);
                fChangeCounts_.PerformedChange ();
            }
            else {
                auto retI = fData_.erase (mir.fIterator);
                fChangeCounts_.PerformedChange ();
                *nextI = Iterator<value_type>{make_unique<IteratorRep_> (&fChangeCounts_, retI)};
            }
        }
 
    private:
        using DataStructureImplType_ = DataStructures::Array<value_type>;
        using IteratorRep_           = Private::IteratorImplHelper_<value_type, DataStructureImplType_>;
 
    private:
        DataStructureImplType_                       fData_;
        qStroika_ATTRIBUTE_NO_UNIQUE_ADDRESS_VCFORCE Private::ContainerDebugChangeCounts_ fChangeCounts_;
    };
 
    /*
     ********************************************************************************
     ************************* Collection_Array<T,TRAITS> ***************************
     ********************************************************************************
     */
    template <typename T>
    inline Collection_Array<T>::Collection_Array ()
        : inherited{Memory::MakeSharedPtr<Rep_> ()}
    {
        AssertRepValidType_ ();
    }
    template <typename T>
    template <IInputIterator<T> ITERATOR_OF_ADDABLE>
    inline Collection_Array<T>::Collection_Array (ITERATOR_OF_ADDABLE&& start, ITERATOR_OF_ADDABLE&& end)
        : Collection_Array{}
    {
        if constexpr (random_access_iterator<ITERATOR_OF_ADDABLE>) {
            if (start != end) {
                reserve (end - start);
            }
        }
        this->AddAll (forward<ITERATOR_OF_ADDABLE> (start), forward<ITERATOR_OF_ADDABLE> (end));
        AssertRepValidType_ ();
    }
    template <typename T>
    inline Collection_Array<T>::Collection_Array (const initializer_list<value_type>& src)
        : Collection_Array{}
    {
        reserve (src.size ());
        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>, Collection_Array<T>>)
    inline Collection_Array<T>::Collection_Array (ITERABLE_OF_ADDABLE&& src)
        : Collection_Array{}
    {
        reserve (src.size ());
        this->AddAll (forward<ITERABLE_OF_ADDABLE> (src));
        AssertRepValidType_ ();
    }
#endif
    template <typename T>
    inline void Collection_Array<T>::AssertRepValidType_ () const
    {
        if constexpr (qStroika_Foundation_Debug_AssertionsChecked) {
            typename inherited::template _SafeReadRepAccessor<Rep_> tmp{this}; // for side-effect of AssertMemeber
        }
    }
 
}