Method push

StackList.h:31–45

    StackList() = default;

    void push(TStackListEntry& entry) noexcept
    {
        entry.next = nullptr;

        if(!mFirst) {
            mFirst       = &entry;
            mFirst->prev = nullptr;

        } else {
            mLast->next = &entry;
            entry.prev  = mLast;
        }

        mLast = &entry;
    }

    T* pop() noexcept
    {