Re: Copy Constructors and Assignment Operator, When should I use?

From:

Abhishek Padmanabh <abhishek.padmanabh@gmail.com>

Newsgroups:

microsoft.public.vc.language

Date:

Mon, 3 Mar 2008 08:04:15 -0800 (PST)

Message-ID:

<3ea8745c-f198-402e-9ca7-968c23ababbd@e23g2000prf.googlegroups.com>

On Mar 3, 8:37 pm, rockdale <rockdale.gr...@gmail.com> wrote:

So, now my question is:

if I erase my item from the vector inside my iteration, do I need to
move the iterator's position?

           std::vector<ItemB>::iterator vecItr;
                      for(vecItr = m_vecB.begin();=

                                vecItr !=

= m_vecB.end();

++vecItr){=

=

if( condition for erase is

ture){
=

m_vecB.erase(vecItr);

//do I need to do

anything in here to avoid the error I got above?
=

}

Erasing an element from a vector invalidates the all iterators after
the erased element, so the above is incorrect. One way to do it would
be:

   std::vector<ItemB>::iterator itend =
             std::remove_if(m_vecB.begin(), m_vecB.end(),
                                         <condition that checks if
remove needed>
                                 );
   m_vecB.erase(itend, m_vecB.end());

<condition that checks if remove needed> is a function or a function
object. That would be coded as:

bool needRemove(const ItemB& item)
{
      //check if item eligible for remove
      //if yes, return true
      //otherwise, return false
}