Question

There is class definition like this:

template <class Impl>
FullO3CPU<Impl>::FullO3CPU(DerivO3CPUParams *params)
class DerivO3CPU : public FullO3CPU<O3CPUImpl>
{
   public:
     DerivO3CPU(DerivO3CPUParams *p)
       : FullO3CPU<O3CPUImpl>(p)
     { }
};

DerivO3CPU * 
DerivO3CPUParams::create()
{
  ...
  return new DerivO3CPU(this);
}

What I changed was adding another argument to FullO3CPU

template <class Impl>
FullO3CPU<Impl>::FullO3CPU(DerivO3CPUParams *params, My_param *mp)

class DerivO3CPU : public FullO3CPU<O3CPUImpl>
{
   public:
     DerivO3CPU(DerivO3CPUParams *p, My_param *mp)
       : FullO3CPU<O3CPUImpl>(p, mp)
     { }
};

DerivO3CPU *
DerivO3CPUParams::create() 
{
  ...
  return new DerivO3CPU(this);
}

However I don’t know what to do with

return new DerivO3CPU(this); 

because I get this error:

error: no matching function for call to 'DerivO3CPU::DerivO3CPU(DerivO3CPUParams* const)'
note: candidates are:
note: DerivO3CPU::DerivO3CPU(DerivO3CPUParams*, My_param*)
note:   candidate expects 2 arguments, 1 provided

Answer 1

Well, you need to add it to create, too, or use one stored somewhere.

DerivO3CPU *
DerivO3CPUParams::create(My_param *p) 
{
  ...
  return new DerivO3CPU(this, p);
}