Кастомный аллокатор

    _startRangePtr = (Range*)((unsigned long)_parentAreaPtr->_memoryEndPtr - sizeof(Range));
    _parentAreaPtr->_memoryEndPtr = (void*)((unsigned long)_parentAreaPtr->_memoryEndPtr - sizeof(Range));
    memoryAlloc += sizeof(Range);
    _parentAreaPtr->_memoryEndPtr = _startRangePtr;

void* MemoryMap::Range::operator new (size_t size)
    {
        if (!isInit)
            return malloc(size);
        MemoryArea* currentArea = startMemoryAreasPtr;
        void* memory = (void*)((unsigned long)currentArea->_memoryEndPtr - size);
        return memory;
    }

MemoryMap::Range::Range(unsigned long size)
    { 
        _memoryStartPtr = NULL;
        _size = size;
        _nextRangePtr = NULL;
    }

struct Range
    {
         void* _memoryStartPtr;
        unsigned long _size;
        MemoryMap::Range* _nextRangePtr;
    };

    _startRangePtr = (Range*)((unsigned char*)_parentAreaPtr->_memoryEndPtr - sizeof(Range));
    _parentAreaPtr->_memoryEndPtr = (void*)((unsigned char*)_parentAreaPtr->_memoryEndPtr - sizeof(Range));