ObjectFieldUtilities.inl

/*
 * Copyright(c) Sophist Solutions, Inc. 1990-2025.  All rights reserved
 */
#include "Stroika/Foundation/Debug/Assertions.h"
 
#include "Stroika/Foundation/Memory/Common.h"
 
namespace Stroika::Foundation::Memory {
 
    /*
     ********************************************************************************
     *************************** GetObjectOwningField *******************************
     ********************************************************************************
     */
    template <typename APPARENT_MEMBER_TYPE, typename OUTER_OBJECT, typename AGGREGATED_OBJECT_TYPE>
    inline OUTER_OBJECT* GetObjectOwningField (APPARENT_MEMBER_TYPE* aggregatedMember, AGGREGATED_OBJECT_TYPE (OUTER_OBJECT::* aggregatedPtrToMember))
    {
        RequireNotNull (aggregatedMember);
        RequireNotNull (aggregatedPtrToMember);
        byte*     adjustedAggregatedMember = reinterpret_cast<byte*> (static_cast<AGGREGATED_OBJECT_TYPE*> (aggregatedMember));
        ptrdiff_t adjustment               = static_cast<ptrdiff_t> (OffsetOf (aggregatedPtrToMember));
        return reinterpret_cast<OUTER_OBJECT*> (adjustedAggregatedMember - adjustment);
    }
    template <typename APPARENT_MEMBER_TYPE, typename OUTER_OBJECT, typename AGGREGATED_OBJECT_TYPE>
    inline const OUTER_OBJECT* GetObjectOwningField (const APPARENT_MEMBER_TYPE* aggregatedMember,
                                                     AGGREGATED_OBJECT_TYPE (OUTER_OBJECT::* aggregatedPtrToMember))
    {
        RequireNotNull (aggregatedMember);
        RequireNotNull (aggregatedPtrToMember);
        const byte* adjustedAggregatedMember = reinterpret_cast<const byte*> (static_cast<const AGGREGATED_OBJECT_TYPE*> (aggregatedMember));
        ptrdiff_t adjustment = static_cast<ptrdiff_t> (OffsetOf (aggregatedPtrToMember));
        return reinterpret_cast<const OUTER_OBJECT*> (adjustedAggregatedMember - adjustment);
    }
 
    template <typename OUTER_OBJECT, typename DATA_MEMBER_TYPE>
    [[deprecated ("Since Stroika v3.0d2 - use Memory::OffsetOf()")]] inline constexpr size_t
    ConvertPointerToDataMemberToOffset (DATA_MEMBER_TYPE (OUTER_OBJECT::* dataMember))
    {
        return Memory::OffsetOf (dataMember);
    }
 
}