Re: [Boost-users] transform_iterator causing strange problems

28 May 2009


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

----- Original Message -----
From: Nat Goodspeed 
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 &p) const
to
const Group& operator()(const std::pair 
&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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