Re: [Boost-users] BOOST_FOREACH and iterating by reference

From: Daniel Gehriger (gehriger_at_[hidden])
Date: 2007-05-24 14:13:16

Christopher Woods wrote:
> 
> Daniel Gehriger wrote:
>> -------------------
>> for (Coll::iterator it = col.begin(); it != col.end(); /* noop */)
>> {
>>     Coll::value_type& o = *(it++);
>>     o.destroy();
>> }
>> -------------------
> 
> Aren't you asking for trouble here?  If the call into a member function
> of a contained object invalidates iterators of the container that holds
> it and you're in the process of iterating over that container and
> calling such a function, then how do you know that the new value for
> 'it' is still points to a valid address within the container itself?
> 
> -Chris
> 

I wasn't precise enough: The call to the member function only invalidates
the iterators pointing to the object.  All other iterators remain valid.

- Daniel

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