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Disabled default construction for iterator archetypes that are not forward traversal iterators

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[SVN r21781]
This commit is contained in:
Thomas Witt
2004-01-16 06:18:44 +00:00
parent 1e3da4b77f
commit 8ca421c140
3 changed files with 43 additions and 1 deletions
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21
include/boost/iterator/iterator_archetypes.hpp
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@ -149,12 +149,23 @@ namespace detail
template <class Derived,class Value> struct archetype;
};
// Constructor argument for those iterators that
// are not default constructible
struct ctor_arg {};
template <class Derived, class Value, class TraversalCategory>
struct traversal_archetype_
: mpl::aux::msvc_eti_base<
typename traversal_archetype_impl<TraversalCategory>::template archetype<Derived,Value>
>::type
{};
{
traversal_archetype_() {}
traversal_archetype_(ctor_arg arg)
: mpl::aux::msvc_eti_base<
typename traversal_archetype_impl<TraversalCategory>::template archetype<Derived,Value>
>::type(arg)
{}
};
template <>
struct traversal_archetype_impl<incrementable_traversal_tag>
@ -162,6 +173,8 @@ namespace detail
template<class Derived, class Value>
struct archetype
{
explicit archetype(ctor_arg) {}
struct bogus { }; // This use to be void, but that causes trouble for iterator_facade. Need more research. -JGS
typedef bogus difference_type;
@ -178,6 +191,9 @@ namespace detail
: public equality_comparable< traversal_archetype_<Derived, Value, single_pass_traversal_tag> >,
public traversal_archetype_<Derived, Value, incrementable_traversal_tag>
{
explicit archetype(ctor_arg arg)
: traversal_archetype_<Derived, Value, incrementable_traversal_tag>(arg)
{}
};
};
@ -198,6 +214,9 @@ namespace detail
struct archetype
: public traversal_archetype_<Derived, Value, single_pass_traversal_tag>
{
archetype()
: traversal_archetype_<Derived, Value, single_pass_traversal_tag>(ctor_arg())
{}
typedef std::ptrdiff_t difference_type;
};
};