[boost] Re: boost::add_reference breaks type deduction

From: David Abrahams (dave_at_[hidden])
Date: 2004-08-25 14:19:43

"Judd Tracy" <jtracy_at_[hidden]> writes:

> I am trying to use boost:add_reference in a template function to protect
> against the reference of reference problems, but it is breaking type
> deduction and I was wondering if any one know of a solution to this.
>
> template<typename Type>
> read(std::istream& stream, Type& data);
>
> This works properly of course.

And it's already protected.  If you are passing a reference type U& as
the 2nd argument, Type will always be deduced as U.  You don't need
add_reference here.

> -----------------------------------------
>
> template<typename Type>
> read (std::istream& stream, typename boost::add_reference<Type>::type data);
>
> This one does not work properly and I have to explicitly specify the type.

-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com