210         bool            empty() const { return m_Size == 0; }  in empty()  function
224             NW_ASSERT(!empty());  in front()
229             NW_ASSERT(!empty());  in front()
234             NW_ASSERT(!empty());  in back()
239             NW_ASSERT(!empty());  in back()
589     using Base::empty;
628     reference       front()       { NW_ASSERT(!empty()); return *begin(); }  in front()
629     const_reference front() const { NW_ASSERT(!empty()); return *begin(); }  in front()
636     reference       back()        { NW_ASSERT(!empty()); return *--end(); }  in back()
637     const_reference back() const  { NW_ASSERT(!empty()); return *--end(); }  in back()
858     bool      IsEmpty() const { return this->empty(); }     //!< @details :private  in IsEmpty()