Re: [Boost-users] [ptr_container] ptr_map predicates

From: David Abrahams (dave_at_[hidden])
Date: 2006-02-11 10:35:06

Thorsten Ottosen <tottosen_at_[hidden]> writes:

> David Abrahams wrote:
>> "Bill Buklis" <boostuser_at_[hidden]> writes:
>> 
>> 
>>>The predicate for std::find_if requires *iterator for the parameter.
>>>However, with ptr_map *iterator returns a reference to the element value
>>>instead of the key/value pair. Normally this is fine (in general code I like
>>>this feature)
>> 
>> 
>> Yikes, this sounds like a gratuitous inconsistency with the standard
>> map semantics, and not one that's "obviously better" than the standard
>> one.  Why be inventive here?
>
> well, the general idea of the library is to hide direct access to the 
> pointers. its shows up most in ptr_map.
>
> the alternative would be to return a "pair-proxy" from operator*().

a tuple of references would work nicely, neh?

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com