7. A useful template trick

• Sometimes, you want to construct an object of type ValueT with default constructor behavior:

  
  template < typename ValueT >
  ValueT Stack< ValueT >::pop()
  {
      if ( is_empty() ) {
          cerr << "Pop failed, stack is empty" << endl;
          return ValueT();
      }
      return m_ptr_data[ --m_top ];
  }
  
  

• Happily, this works fine when ValueT is a native C++ type!