208         bool            empty() const { return m_Size == 0; }  in empty()  function
222             NW_ASSERT(!empty());  in front()
227             NW_ASSERT(!empty());  in front()
232             NW_ASSERT(!empty());  in back()
237             NW_ASSERT(!empty());  in back()
586     using Base::empty;
625     reference       front()       { NW_ASSERT(!empty()); return *begin(); }  in front()
626     const_reference front() const { NW_ASSERT(!empty()); return *begin(); }  in front()
633     reference       back()        { NW_ASSERT(!empty()); return *--end(); }  in back()
634     const_reference back() const  { NW_ASSERT(!empty()); return *--end(); }  in back()
855     bool      IsEmpty() const { return this->empty(); }     //!< @details :private  in IsEmpty()