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Added traversal category checking to core interface implementation.

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[SVN r1399]
This commit is contained in:
Thomas Witt
2003-07-02 20:04:26 +00:00
parent 21141ef401
commit 2d4965d72b
1 changed files with 27 additions and 5 deletions
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32
include/boost/iterator/iterator_adaptor.hpp
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@@ -273,11 +273,27 @@ namespace boost
void advance(typename super_t::difference_type n) void advance(typename super_t::difference_type n)
{ {
BOOST_STATIC_ASSERT(
(detail::is_tag<
random_access_traversal_tag
, typename super_t::iterator_category::traversal
>::value)
);
m_iterator += n; m_iterator += n;
} }
void increment() { ++m_iterator; } void increment() { ++m_iterator; }
void decrement() { --m_iterator; }
void decrement()
{
BOOST_STATIC_ASSERT(
(detail::is_tag<
bidirectional_traversal_tag
, typename super_t::iterator_category::traversal
>::value)
);
--m_iterator;
}
template < template <
class OtherDerived, class OtherIterator, class V, class C, class R, class D class OtherDerived, class OtherIterator, class V, class C, class R, class D
@@ -285,10 +301,16 @@ namespace boost
typename super_t::difference_type distance_to( typename super_t::difference_type distance_to(
iterator_adaptor<OtherDerived, OtherIterator, V, C, R, D> const& y) const iterator_adaptor<OtherDerived, OtherIterator, V, C, R, D> const& y) const
{ {
// Maybe readd with same_distance BOOST_STATIC_ASSERT(
// BOOST_STATIC_ASSERT( (detail::is_tag<
// (detail::same_category_and_difference<Derived,OtherDerived>::value) random_access_traversal_tag
// ); , typename super_t::iterator_category::traversal
>::value)
);
// Maybe readd with same_distance
// BOOST_STATIC_ASSERT(
// (detail::same_category_and_difference<Derived,OtherDerived>::value)
// );
return y.base() - m_iterator; return y.base() - m_iterator;
} }