RE: [boost] Iterator Adaptor not using traits as template args

From: Jeremy Siek (jsiek_at_[hidden])
Date: 2001-02-27 10:25:26

Thanks for bringing this up Aleksey! Looks really interesting.

I'm wondering whether or not the Base type should really be a parameter of
iterator_traits builder, or if iterator_traits_builder should look more
like std::iterator<>.

On Tue, 27 Feb 2001, Aleksey Gurtovoy wrote:
alexy> 
alexy> template<
alexy>   class Base
alexy> , class Value     = BOOST_ARG_DEPENDENT_TYPENAME
alexy> boost::detail::iterator_traits<Base>::value_type
alexy> , class Reference = BOOST_ARG_DEPENDENT_TYPENAME
alexy> boost::detail::iterator_defaults<Base,Value>::reference
alexy> , class Category  = BOOST_ARG_DEPENDENT_TYPENAME
alexy> boost::detail::iterator_traits<Base>::iterator_category
alexy> , class Distance  = BOOST_ARG_DEPENDENT_TYPENAME
alexy> boost::detail::iterator_traits<Base>::difference_type
alexy> , class Pointer   = BOOST_ARG_DEPENDENT_TYPENAME
alexy> boost::detail::iterator_defaults<Base,Value>::pointer
alexy> > struct iterator_traits_builder {
alexy> 

alexy> 
alexy>   template<class U> struct value      : iterator_traits_builder<U,
alexy> Reference, Category, Distance, Pointer> {};
alexy>   template<class U> struct reference  : iterator_traits_builder<Value, U,
alexy> Category, Distance, Pointer> {};
alexy>   template<class U> struct category   : iterator_traits_builder<Value,
alexy> Reference, U, Distance, Pointer> {};
alexy>   template<class U> struct distance   : iterator_traits_builder<Value,
alexy> Reference, Category, U, Pointer> {};
alexy>   template<class U> struct pointer    : iterator_traits_builder<Value,
alexy> Reference, Category, Distance, U> {};
alexy> };

Oops, in the above uses of iterator_traits_builder you forgot the
first argument: the Base type ;)

Cheers,
Jeremy

----------------------------------------------------------------------
 Jeremy Siek                        www: http://www.lsc.nd.edu/~jsiek/
 Ph.D. Candidate                  email: jsiek_at_[hidden]
 Univ. of Notre Dame         work phone: [phone]
----------------------------------------------------------------------