Re: Removing collection elements with const iterators
Adam Badura wrote:
[...] if I have a const collection object then no matter what
iterators I have I will not be able to erase any element. But
if I have a non-const collection object then why am I not allowed
to erase its elements with a const iterator? After all I could as
well take new non-const begin and advance it until it is equal to
the const iterator and use such iterator for erasure.
This is a known problem. In other words, an iterator has three different
interfaces:
1. Marking a position in a sequence.
2. Read access to the underlying element.
3. Write access to the underlying element.
For erasing, only the first interface is actually necessary, but there is=
no
distinct type common to both "iterator" and "const_iterator" that provide=
s
this interface, instead the containers all want the "iterator" as
parameter.
Uli
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