Re: [Boost-users] transform_iterator causing strange problems

Subject: Re: [Boost-users] transform_iterator causing strange problems
From: Lindley M French (lfrench1_at_[hidden])
Date: 2009-05-28 12:17:53

Ah! That does make sense. Okay, I'll do that.

----- Original Message -----
From: Nat Goodspeed <nat_at_[hidden]>
Date: Thursday, May 28, 2009 6:30 am
Subject: Re: [Boost-users] transform_iterator causing strange problems

> Mathias Gaunard wrote:
> 
> > Lindley M French wrote:
> 
> >> Okay, that makes sense as a cause, anyway. I'm not clear on how 
> to fix 
> >> it.
> 
> > Well, given the cause is temporaries due to implicit 
> conversions, just 
> > don't make those implicit conversions.
> > 
> > just change
> > const Group& operator()(const std::pair<GroupID, Group> &p) const
> > 
> > to
> > const Group& operator()(const std::pair<const GroupID, Group> 
> &p) const
> 
> The fact that the value of a map iterator does not exactly 
> resemble the 
> declaration of the map itself (implicit 'const' on the key) has 
> bitten 
> me more often than I care to admit. I've been trying to cultivate 
> the 
> habit of always using my_map_typedef::value_type whenever the 
> std::pair 
> in question comes from a map. So:
> 
> const Group& operator()(const OP_map_typedef::value_type& p) const
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