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bugfix tuples::null_type and tuples::tuple<> iterators not comparing ok.

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[SVN r39359]
This commit is contained in:
Joel de Guzman
2007-09-18 00:18:56 +00:00
parent f8e8b4bbf5
commit 6b56ded55a
1 changed files with 55 additions and 8 deletions
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55
include/boost/fusion/sequence/adapted/boost_tuple/boost_tuple_iterator.hpp
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@ -19,6 +19,24 @@ namespace boost { namespace fusion
{
struct forward_traversal_tag;
namespace detail
{
template <typename T>
struct boost_tuple_is_empty : mpl::false_ {};
template <>
struct boost_tuple_is_empty<tuples::null_type> : mpl::true_ {};
template <>
struct boost_tuple_is_empty<tuples::null_type const> : mpl::true_ {};
template <>
struct boost_tuple_is_empty<tuples::tuple<> > : mpl::true_ {};
template <>
struct boost_tuple_is_empty<tuples::tuple<> const> : mpl::true_ {};
}
template <typename Cons = tuples::null_type>
struct boost_tuple_iterator
: iterator_facade<boost_tuple_iterator<Cons>, forward_traversal_tag>
@ -72,11 +90,40 @@ namespace boost { namespace fusion
return type(iter.cons.get_tail());
}
};
template <typename I1, typename I2>
struct equal_to
: mpl::or_<
is_same<I1, I2>
, mpl::and_<
detail::boost_tuple_is_empty<typename I1::cons_type>
, detail::boost_tuple_is_empty<typename I2::cons_type>
>
>
{};
};
template <typename Null>
struct boost_tuple_null_iterator
: iterator_facade<boost_tuple_iterator<Null>, forward_traversal_tag>
{
typedef Null cons_type;
template <typename I1, typename I2>
struct equal_to
: mpl::or_<
is_same<I1, I2>
, mpl::and_<
detail::boost_tuple_is_empty<typename I1::cons_type>
, detail::boost_tuple_is_empty<typename I2::cons_type>
>
>
{};
};
template <>
struct boost_tuple_iterator<tuples::null_type>
: iterator_facade<boost_tuple_iterator<tuples::null_type>, forward_traversal_tag>
: boost_tuple_null_iterator<tuples::null_type>
{
template <typename Cons>
explicit boost_tuple_iterator(Cons const&) {}
@ -84,7 +131,7 @@ namespace boost { namespace fusion
template <>
struct boost_tuple_iterator<tuples::null_type const>
: iterator_facade<boost_tuple_iterator<tuples::null_type const>, forward_traversal_tag>
: boost_tuple_null_iterator<tuples::null_type const>
{
template <typename Cons>
explicit boost_tuple_iterator(Cons const&) {}
@ -92,7 +139,7 @@ namespace boost { namespace fusion
template <>
struct boost_tuple_iterator<tuples::tuple<> >
: iterator_facade<boost_tuple_iterator<tuples::tuple<> >, forward_traversal_tag>
: boost_tuple_null_iterator<tuples::tuple<> >
{
template <typename Cons>
explicit boost_tuple_iterator(Cons const&) {}
@ -100,7 +147,7 @@ namespace boost { namespace fusion
template <>
struct boost_tuple_iterator<tuples::tuple<> const>
: iterator_facade<boost_tuple_iterator<tuples::tuple<> const>, forward_traversal_tag>
: boost_tuple_null_iterator<tuples::tuple<> const>
{
template <typename Cons>
explicit boost_tuple_iterator(Cons const&) {}