iterators.hpp

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//
// libcppwrap - A collection of C++ wrappers for native APIs
// Copyright (C) 2021-2023 David A. Norris <danorris@gmail.com>
// Published under the MIT license - https://opensource.org/licenses/MIT
//
 
#pragma once
 
#include <iterator>
 
namespace w
{
    template <typename ListNode, const ListNode * (*Next)(const ListNode *)>
    struct const_list_iterator
    {
        const_list_iterator() noexcept : _current(nullptr) { }
 
        const_list_iterator(const ListNode *current) noexcept : _current(current) { }
 
        const_list_iterator& operator++() noexcept
        {
            _current = Next(_current);
            return *this;
        }
 
        const ListNode& operator*() const noexcept { return *_current; }
 
        const ListNode *operator->() const noexcept { return _current; }
 
        bool operator==(const_list_iterator const& rhs) const noexcept { return _current == rhs._current; }
 
        bool operator!=(const_list_iterator const& rhs) const noexcept { return _current != rhs._current; }
 
        private: const ListNode *_current;
    };
}
 
template <typename ListNode, const ListNode * (*Next)(const ListNode *)>
struct std::iterator_traits<w::const_list_iterator<ListNode, Next>>
{
    typedef std::ptrdiff_t              difference_type;
    typedef ListNode                    value_type;
    typedef const ListNode *            pointer;
    typedef const ListNode&             reference;
    typedef std::forward_iterator_tag   iterator_category;
};