Re: [Boost-users] add_const_ref type transformation metafct

Subject: Re: [Boost-users] add_const_ref type transformation metafct
From: Nat Goodspeed (nat_at_[hidden])
Date: 2009-04-04 09:41:49

Hicham Mouline wrote:

> I wish to have a metafct that adds "const &" to types that have it or don't
> have it...
> 
> template< typename T >
> struct add_const_ref {
>   typedef typename boost::remove_const<T>::type      t1;
>   typedef typename boost::add_const<t1>::type        t2;
>   typedef typename boost::add_reference<t2>::type    type;
> };
> 
> Does this exist already in type traits or elsewhere? I couldn't find....

How about boost::call_traits<T>::param_type?
http://www.boost.org/doc/libs/1_38_0/libs/utility/call_traits.htm