[petsc-users] Assignement operator overloading for vectors

[Cedric Doucet]

Hello,

I need to overload the assignement operator for a C++ class which has a Petsc 
vector as a data member:

class Foo
{
public:
  Foo & operator=(Foo const & copy);
private:
  Vec m_vec;
};

The algorithm for overloading the assignement operator should look like this :

Foo & Foo::operator=(Foo const & copy)
{
  if ( this != copy )
  {
    // destroy this->m_vec
    // allocate this->m_vec with the same size as copy.m_vec's size
    // copy the content of copy.m_vec into this->m_vec
  }
  return *this;
}

I thought that VecCopy(copy.m_vec,m_vec) does everything I need but I have an 
error during the execution.
So I tried to call first VecDuplicate(copy.m_vec,&m_vec) and then 
VecCopy(copy.m_vec,m_vec) but I still have an error.
How shoud assignement operator overloading be implemented?
Do I have to call VecDestroy before calling VecDuplicate?
Must input vectors have the same size in VecCopy?

Thank you very much for your help!

Best regards,

Cédric Doucet