114 lines
3.5 KiB
C++
114 lines
3.5 KiB
C++
/* vim: set sw=4 sts=4 et foldmethod=syntax : */
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/*
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* Copyright (c) 2007, 2008, 2009 Ciaran McCreesh
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* Copyright (c) 2007 David Leverton
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*
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* This file is part of the Paludis package manager. Paludis is free software;
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* you can redistribute it and/or modify it under the terms of the GNU General
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* Public License version 2, as published by the Free Software Foundation.
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*
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* Paludis is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef PALUDIS_GUARD_PALUDIS_UTIL_MEMBER_ITERATOR_HH
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#define PALUDIS_GUARD_PALUDIS_UTIL_MEMBER_ITERATOR_HH 1
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#include <paludis/util/member_iterator-fwd.hh>
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#include <paludis/util/operators.hh>
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#include <type_traits>
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namespace paludis
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{
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template <typename Iterator_>
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struct FirstIteratorTypes
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{
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typedef MemberIterator<
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typename std::remove_reference<typename std::iterator_traits<Iterator_>::value_type>::type::first_type,
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Iterator_,
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&std::remove_reference<typename std::iterator_traits<Iterator_>::value_type>::type::first>
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Type;
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};
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template <typename Iterator_>
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struct SecondIteratorTypes
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{
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typedef MemberIterator<
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typename std::remove_reference<typename std::iterator_traits<Iterator_>::value_type>::type::second_type,
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Iterator_,
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&std::remove_reference<typename std::iterator_traits<Iterator_>::value_type>::type::second>
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Type;
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};
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/**
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* A MemberIterator is a wrapper around a forward iterator to a struct,
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* selecting one particular member of that struct for the value.
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*
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* \ingroup g_iterator
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* \since 0.26
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*/
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template <typename Value_, typename Iterator_,
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Value_ std::remove_reference<typename std::iterator_traits<Iterator_>::value_type>::type::* member_>
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class MemberIterator :
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public equality_operators::HasEqualityOperators
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{
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private:
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Iterator_ _iter;
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public:
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///\name Basic operations
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///\{
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MemberIterator();
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MemberIterator(const MemberIterator &);
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MemberIterator(const Iterator_ &);
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MemberIterator & operator= (const MemberIterator &);
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///\}
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///\name Standard library typedefs
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///\{
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typedef typename std::remove_const<typename std::remove_reference<Value_>::type>::type value_type;
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typedef const typename std::remove_reference<Value_>::type & reference;
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typedef const typename std::remove_reference<Value_>::type * pointer;
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typedef std::ptrdiff_t difference_type;
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typedef std::forward_iterator_tag iterator_category;
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///\}
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///\name Increment
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///\{
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MemberIterator & operator++ ();
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MemberIterator operator++ (int);
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///\}
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///\name Dereference
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///\{
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pointer operator-> () const;
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reference operator* () const;
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///\}
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///\name Equality
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///\{
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bool operator== (const MemberIterator &) const;
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///\}
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};
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}
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#endif
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