[boost] [Range] Non-mutating algorithm on non const qualified range

Subject: [boost] [Range] Non-mutating algorithm on non const qualified range
From: Albert Yiamakis (vkicefire_at_[hidden])
Date: 2014-03-24 03:06:50

Hello,

In the users mailing list I have remarked that this piece of code:

https://gist.github.com/Kojirion/9714131

will fail to compile, without providing 'mutable' iterators.
I have since found out it will also compile by simply const qualifying
the dummy object. (ie const Dummy dummy;)

The reason is that without it this:

is_const<Dummy> gets evaluated to false, resulting in

boost::mpl::eval_if_c<false, boost::range_const_iterator<Dummy>,
boost::range_mutable_iterator<Dummy> >

Surely this is not intended behavior and it should be possible to use a
range that has only const iterators in a non-mutating algorithm without
const qualifying it?

Albert