Re: default constructor and class

[Michael Goffioul]

On Mon, Jul 8, 2013 at 3:20 PM, Marco Vassallo <address@hidden> wrote:

Hi all,

for the fem-fenics pkg I'm creating a new class, and I thus add as private members

  DECLARE_OCTAVE_ALLOCATOR;
  DECLARE_OV_TYPEID_FUNCTIONS_AND_DATA;

and also the DEFINE counterpart,

which requires the class to have a default constructor (right?)

The problem is that one of the parent class from which I derive my own class
doesn't provide a default constructor. Example

class B: public octave_base_value, public A
{
  B(): octave_base_value(), A(), B() {} //error: A() not available

  private:
  A my_element;
  DECLARE_OCTAVE_ALLOCATOR;
  DECLARE_OV_TYPEID_FUNCTIONS_AND_DATA;
}

How can I manage it?

I'm not sure I understand your construct correctly, but is it intentional that B inherits from A *and* contains a A object (my_element)? Can't you get rid of the inheritance from A and just have the my_element member?

Michael.