Re: Deleting an element from a list in a loop

"Andrew Chalk" <>
Wed, 30 Aug 2006 01:51:36 -0500
"Doug Harrison [MVP]" <> wrote in message

On Wed, 30 Aug 2006 00:09:09 -0500, "Andrew Chalk"
<> wrote:

Will deleting an element from a list while iterating through a loop mess
the internal pointers? I am thinking of a construct such as this where I
call erase() in the loop:

for (;it != m_list.end(); it++) {

   if ((*it)->ThreadFinished() == true) {

       ...DO STUFF

       m_list.erase(it); // delete the element from the list

       // Do we need to break out of the loop here?



Erasing a list element invalidates iterators, references, and pointers to
the item erased, so you need to structure your loop like this:

while (it != m_list.end())
  if ((*it)->ThreadFinished()) // Don't compare against true or false
     it = m_list.erase(it);
     // or m_list.erase(it++);

Doug Harrison
Visual C++ MVP

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