Re: [Boost-users] Warnings and boost

From: Sebastian Redl (sebastian.redl_at_[hidden])
Date: 2006-01-26 06:36:40

gast128 wrote:

>An example is the counting iterator:
>
>const std::vector<int> values1(boost::make_counting_iterator(1), 
>boost::make_counting_iterator(10));
>
>gives C4244. This is even harder to supress since the STL is included in the 
>precompiled header.
>  
>
This code should really not give you any warnings. (And doesn't on GCC, 
though I doubt that'll help you.)
C4244, so that others don't have to look it up, is the "conversion with 
possible data loss" warning. This indicates that in VC++, 
make_counting_iterator returns a counting_iterator<long> or even 
<__int64>. Can somebody with that compiler post the output of this line?
std::cout << typeid(boost::make_counting_iterator(1)).name() << std::endl;

A simple workaround for this particular warning ought to be to directly 
instantiate counting_iterators with their template parameter set correctly.

Sebastian Redl