forked from boostorg/iterator
74 lines
1.8 KiB
C++
Executable File
74 lines
1.8 KiB
C++
Executable File
// Copyright David Abrahams 2004. Use, modification and distribution is
|
|
// subject to the Boost Software License, Version 1.0. (See accompanying
|
|
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
#ifndef NODE_ITERATOR2_DWA2004110_HPP
|
|
# define NODE_ITERATOR2_DWA2004110_HPP
|
|
|
|
# include "node.hpp"
|
|
# include <boost/iterator/iterator_facade.hpp>
|
|
|
|
# ifndef BOOST_NO_SFINAE
|
|
# include <boost/type_traits/is_convertible.hpp>
|
|
# include <boost/utility/enable_if.hpp>
|
|
# endif
|
|
|
|
template <class Value>
|
|
class node_iter
|
|
: public boost::iterator_facade<
|
|
node_iter<Value>
|
|
, Value
|
|
, boost::forward_traversal_tag
|
|
>
|
|
{
|
|
private:
|
|
struct enabler {}; // a private type avoids misuse
|
|
|
|
public:
|
|
node_iter()
|
|
: m_node(0) {}
|
|
|
|
explicit node_iter(Value* p)
|
|
: m_node(p) {}
|
|
|
|
template <class OtherValue>
|
|
node_iter(
|
|
node_iter<OtherValue> const& other
|
|
# ifndef BOOST_NO_SFINAE
|
|
, typename boost::enable_if<
|
|
boost::is_convertible<OtherValue*,Value*>
|
|
, enabler
|
|
>::type = enabler()
|
|
# endif
|
|
)
|
|
: m_node(other.m_node) {}
|
|
|
|
|
|
# if !BOOST_WORKAROUND(__GNUC__, == 2)
|
|
private: // GCC2 can't grant friendship to template member functions
|
|
friend class boost::iterator_core_access;
|
|
# endif
|
|
|
|
template <class OtherValue>
|
|
bool equal(node_iter<OtherValue> const& other) const
|
|
{
|
|
return this->m_node == other.m_node;
|
|
}
|
|
|
|
void increment() { m_node = m_node->next(); }
|
|
|
|
Value& dereference() const { return *m_node; }
|
|
|
|
# ifdef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
|
|
public:
|
|
# else
|
|
private:
|
|
template <class> friend class node_iter;
|
|
# endif
|
|
Value* m_node;
|
|
};
|
|
|
|
typedef node_iter<node_base> node_iterator;
|
|
typedef node_iter<node_base const> node_const_iterator;
|
|
|
|
#endif // NODE_ITERATOR2_DWA2004110_HPP
|