Hello
Given this:
list<mystruct_t > lst;
lst.push_back(i tem1);
lst.push_back(i tem2);
lst.push_back(i tem3);
Now say I have this:
mystruct_t *p1, *p2, *p3 pointing to item1->item3 memory in side the list.
If I delete "item2" (or second item) will the other pointers still be valid?
--
Elias 4 1288
"lallous" <la*****@lgwm.o rg> wrote in message
news:2t******** *****@uni-berlin.de... Hello
Given this:
list<mystruct_t > lst;
lst.push_back(i tem1); lst.push_back(i tem2); lst.push_back(i tem3);
Now say I have this:
mystruct_t *p1, *p2, *p3 pointing to item1->item3 memory in side the list.
If I delete "item2" (or second item) will the other pointers still be
valid?
If you use iterators instead of pointers (like you should) then the C++
standard guarantees that the iterators will remain valid. I don't know that
the standard guarantees that pointers will be OK, but its very likely to
work.
John
"John Harrison" <jo************ *@hotmail.com> wrote in message
news:2t******** *****@uni-berlin.de... "lallous" <la*****@lgwm.o rg> wrote in message news:2t******** *****@uni-berlin.de... Hello
Given this:
list<mystruct_t > lst;
lst.push_back(i tem1); lst.push_back(i tem2); lst.push_back(i tem3);
Now say I have this:
mystruct_t *p1, *p2, *p3 pointing to item1->item3 memory in side the list.
If I delete "item2" (or second item) will the other pointers still be valid?
If you use iterators instead of pointers (like you should) then the C++ standard guarantees that the iterators will remain valid. I don't know that the standard guarantees that pointers will be OK, but its very likely to work.
You mean I change p1, p2, p3 to:
list<mystruct_t >::iterator p1, p2, p3;
then have p1, p2, p3 point to each element, then when any element is deleted
the other iterators are still valid?
--
Elias
"John Harrison" <jo************ *@hotmail.com> wrote in message If you use iterators instead of pointers (like you should) then the C++ standard guarantees that the iterators will remain valid.
I think Standard only talks of iterators and references remaining valid, and
am too lazy to check the Standard :-)
Sharad
"lallous" <la*****@lgwm.o rg> wrote in message
news:2t******** *****@uni-berlin.de... "John Harrison" <jo************ *@hotmail.com> wrote in message news:2t******** *****@uni-berlin.de... "lallous" <la*****@lgwm.o rg> wrote in message news:2t******** *****@uni-berlin.de... Hello
Given this:
list<mystruct_t > lst;
lst.push_back(i tem1); lst.push_back(i tem2); lst.push_back(i tem3);
Now say I have this:
mystruct_t *p1, *p2, *p3 pointing to item1->item3 memory in side the list.
If I delete "item2" (or second item) will the other pointers still be valid?
If you use iterators instead of pointers (like you should) then the C++ standard guarantees that the iterators will remain valid. I don't know that the standard guarantees that pointers will be OK, but its very likely to work.
You mean I change p1, p2, p3 to: list<mystruct_t >::iterator p1, p2, p3;
then have p1, p2, p3 point to each element, then when any element is
deleted the other iterators are still valid?
Yes.
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