Re: [boost] Named template parameters

From: David Abrahams (abrahams_at_[hidden])
Date: 2001-03-06 00:14:53

----- Original Message ----- 
From: "Jeremy Siek" <jsiek_at_[hidden]>
To: <boost_at_[hidden]>
Sent: Monday, March 05, 2001 10:43 PM
Subject: Re: [boost] Named template parameters

> 
> Hmm, I think I missed a turn in the road earlier on ;)
> 
> Are you suggesting the following?
> 
> template <class Base,
>           class Policies,
>           class ValueOrNamedParameters = boost::detail::default,
>           class ReferenceOrNamedParameters = boost::detail::default,
>           ...>
> class iterator_adaptor;
> 
> and could then be used like the old way:
> 
> iterator_adaptor<int*, default_iterator_policies, int, int&, ...>
> 
> and could also be used like this:
> 
> iterator_adaptor<int, default_iterator_policies,
>   iterator_traits_builder
>   ::reference<int>
>   ::iterator_category<std::input_iterator_tag>

Well, perhaps this, to show equivalence

iterator_adaptor<int*, default_iterator_policies,
  iterator_traits_builder
  ::value_type<int>
  ::iterator_category<std::input_iterator_tag>::type>

but also (equivalently) this:

iterator_adaptor<int, default_iterator_policies,
  int,
  iterator_traits_builder
  ::iterator_category<std::input_iterator_tag>::type>

-Dave