1a1b20be14
2007-11-07 Paolo Carlini <pcarlini@suse.de> * include/bits/stl_iterator.h (move_iterator<>::pointer): Adjust typedef per DR 680 [Ready]. From-SVN: r129959
1031 lines
32 KiB
C++
1031 lines
32 KiB
C++
// Iterators -*- C++ -*-
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// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
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// Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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/*
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*
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* Copyright (c) 1994
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* Hewlett-Packard Company
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Hewlett-Packard Company makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*
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*
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* Copyright (c) 1996-1998
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* Silicon Graphics Computer Systems, Inc.
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Silicon Graphics makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*/
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/** @file stl_iterator.h
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* This is an internal header file, included by other library headers.
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* You should not attempt to use it directly.
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*
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* This file implements reverse_iterator, back_insert_iterator,
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* front_insert_iterator, insert_iterator, __normal_iterator, and their
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* supporting functions and overloaded operators.
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*/
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#ifndef _STL_ITERATOR_H
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#define _STL_ITERATOR_H 1
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#include <bits/cpp_type_traits.h>
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#include <ext/type_traits.h>
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#include <bits/stl_move.h>
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_GLIBCXX_BEGIN_NAMESPACE(std)
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// 24.4.1 Reverse iterators
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/**
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* "Bidirectional and random access iterators have corresponding reverse
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* %iterator adaptors that iterate through the data structure in the
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* opposite direction. They have the same signatures as the corresponding
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* iterators. The fundamental relation between a reverse %iterator and its
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* corresponding %iterator @c i is established by the identity:
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* @code
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* &*(reverse_iterator(i)) == &*(i - 1)
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* @endcode
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*
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* This mapping is dictated by the fact that while there is always a
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* pointer past the end of an array, there might not be a valid pointer
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* before the beginning of an array." [24.4.1]/1,2
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*
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* Reverse iterators can be tricky and surprising at first. Their
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* semantics make sense, however, and the trickiness is a side effect of
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* the requirement that the iterators must be safe.
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*/
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template<typename _Iterator>
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class reverse_iterator
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: public iterator<typename iterator_traits<_Iterator>::iterator_category,
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typename iterator_traits<_Iterator>::value_type,
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typename iterator_traits<_Iterator>::difference_type,
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typename iterator_traits<_Iterator>::pointer,
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typename iterator_traits<_Iterator>::reference>
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{
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protected:
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_Iterator current;
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public:
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typedef _Iterator iterator_type;
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typedef typename iterator_traits<_Iterator>::difference_type
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difference_type;
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typedef typename iterator_traits<_Iterator>::reference reference;
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typedef typename iterator_traits<_Iterator>::pointer pointer;
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public:
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/**
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* The default constructor default-initializes member @p current.
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* If it is a pointer, that means it is zero-initialized.
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*/
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 235 No specification of default ctor for reverse_iterator
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reverse_iterator() : current() { }
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/**
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* This %iterator will move in the opposite direction that @p x does.
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*/
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explicit
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reverse_iterator(iterator_type __x) : current(__x) { }
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/**
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* The copy constructor is normal.
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*/
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reverse_iterator(const reverse_iterator& __x)
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: current(__x.current) { }
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/**
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* A reverse_iterator across other types can be copied in the normal
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* fashion.
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*/
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template<typename _Iter>
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reverse_iterator(const reverse_iterator<_Iter>& __x)
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: current(__x.base()) { }
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/**
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* @return @c current, the %iterator used for underlying work.
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*/
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iterator_type
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base() const
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{ return current; }
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/**
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* @return TODO
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*
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* @doctodo
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*/
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reference
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operator*() const
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{
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_Iterator __tmp = current;
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return *--__tmp;
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}
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/**
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* @return TODO
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*
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* @doctodo
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*/
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pointer
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operator->() const
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{ return &(operator*()); }
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/**
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* @return TODO
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*
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* @doctodo
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*/
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reverse_iterator&
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operator++()
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{
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--current;
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return *this;
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}
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/**
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* @return TODO
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*
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* @doctodo
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*/
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reverse_iterator
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operator++(int)
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{
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reverse_iterator __tmp = *this;
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--current;
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return __tmp;
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}
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/**
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* @return TODO
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*
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* @doctodo
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*/
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reverse_iterator&
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operator--()
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{
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++current;
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return *this;
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}
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/**
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* @return TODO
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*
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* @doctodo
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*/
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reverse_iterator
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operator--(int)
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{
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reverse_iterator __tmp = *this;
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++current;
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return __tmp;
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}
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/**
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* @return TODO
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*
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* @doctodo
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*/
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reverse_iterator
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operator+(difference_type __n) const
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{ return reverse_iterator(current - __n); }
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/**
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* @return TODO
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*
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* @doctodo
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*/
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reverse_iterator&
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operator+=(difference_type __n)
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{
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current -= __n;
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return *this;
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}
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/**
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* @return TODO
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*
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* @doctodo
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*/
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reverse_iterator
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operator-(difference_type __n) const
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{ return reverse_iterator(current + __n); }
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/**
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* @return TODO
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*
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* @doctodo
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*/
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reverse_iterator&
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operator-=(difference_type __n)
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{
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current += __n;
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return *this;
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}
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/**
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* @return TODO
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*
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* @doctodo
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*/
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reference
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operator[](difference_type __n) const
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{ return *(*this + __n); }
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};
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//@{
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/**
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* @param x A %reverse_iterator.
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* @param y A %reverse_iterator.
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* @return A simple bool.
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*
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* Reverse iterators forward many operations to their underlying base()
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* iterators. Others are implemented in terms of one another.
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*
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*/
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template<typename _Iterator>
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inline bool
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operator==(const reverse_iterator<_Iterator>& __x,
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const reverse_iterator<_Iterator>& __y)
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{ return __x.base() == __y.base(); }
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template<typename _Iterator>
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inline bool
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operator<(const reverse_iterator<_Iterator>& __x,
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const reverse_iterator<_Iterator>& __y)
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{ return __y.base() < __x.base(); }
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template<typename _Iterator>
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inline bool
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operator!=(const reverse_iterator<_Iterator>& __x,
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const reverse_iterator<_Iterator>& __y)
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{ return !(__x == __y); }
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template<typename _Iterator>
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inline bool
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operator>(const reverse_iterator<_Iterator>& __x,
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const reverse_iterator<_Iterator>& __y)
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{ return __y < __x; }
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template<typename _Iterator>
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inline bool
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operator<=(const reverse_iterator<_Iterator>& __x,
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const reverse_iterator<_Iterator>& __y)
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{ return !(__y < __x); }
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template<typename _Iterator>
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inline bool
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operator>=(const reverse_iterator<_Iterator>& __x,
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const reverse_iterator<_Iterator>& __y)
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{ return !(__x < __y); }
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template<typename _Iterator>
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inline typename reverse_iterator<_Iterator>::difference_type
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operator-(const reverse_iterator<_Iterator>& __x,
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const reverse_iterator<_Iterator>& __y)
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{ return __y.base() - __x.base(); }
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template<typename _Iterator>
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inline reverse_iterator<_Iterator>
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operator+(typename reverse_iterator<_Iterator>::difference_type __n,
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const reverse_iterator<_Iterator>& __x)
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{ return reverse_iterator<_Iterator>(__x.base() - __n); }
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// DR 280. Comparison of reverse_iterator to const reverse_iterator.
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template<typename _IteratorL, typename _IteratorR>
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inline bool
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operator==(const reverse_iterator<_IteratorL>& __x,
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const reverse_iterator<_IteratorR>& __y)
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{ return __x.base() == __y.base(); }
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template<typename _IteratorL, typename _IteratorR>
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inline bool
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operator<(const reverse_iterator<_IteratorL>& __x,
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const reverse_iterator<_IteratorR>& __y)
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{ return __y.base() < __x.base(); }
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template<typename _IteratorL, typename _IteratorR>
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inline bool
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operator!=(const reverse_iterator<_IteratorL>& __x,
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const reverse_iterator<_IteratorR>& __y)
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{ return !(__x == __y); }
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template<typename _IteratorL, typename _IteratorR>
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inline bool
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operator>(const reverse_iterator<_IteratorL>& __x,
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const reverse_iterator<_IteratorR>& __y)
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{ return __y < __x; }
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template<typename _IteratorL, typename _IteratorR>
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inline bool
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operator<=(const reverse_iterator<_IteratorL>& __x,
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const reverse_iterator<_IteratorR>& __y)
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{ return !(__y < __x); }
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template<typename _IteratorL, typename _IteratorR>
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inline bool
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operator>=(const reverse_iterator<_IteratorL>& __x,
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const reverse_iterator<_IteratorR>& __y)
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{ return !(__x < __y); }
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template<typename _IteratorL, typename _IteratorR>
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inline typename reverse_iterator<_IteratorL>::difference_type
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operator-(const reverse_iterator<_IteratorL>& __x,
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const reverse_iterator<_IteratorR>& __y)
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{ return __y.base() - __x.base(); }
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//@}
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// 24.4.2.2.1 back_insert_iterator
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/**
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* @brief Turns assignment into insertion.
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*
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* These are output iterators, constructed from a container-of-T.
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* Assigning a T to the iterator appends it to the container using
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* push_back.
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*
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* Tip: Using the back_inserter function to create these iterators can
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* save typing.
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*/
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template<typename _Container>
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class back_insert_iterator
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: public iterator<output_iterator_tag, void, void, void, void>
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{
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protected:
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_Container* container;
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public:
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/// A nested typedef for the type of whatever container you used.
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typedef _Container container_type;
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/// The only way to create this %iterator is with a container.
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explicit
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back_insert_iterator(_Container& __x) : container(&__x) { }
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/**
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* @param value An instance of whatever type
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* container_type::const_reference is; presumably a
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* reference-to-const T for container<T>.
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* @return This %iterator, for chained operations.
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*
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* This kind of %iterator doesn't really have a "position" in the
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* container (you can think of the position as being permanently at
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* the end, if you like). Assigning a value to the %iterator will
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* always append the value to the end of the container.
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*/
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back_insert_iterator&
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operator=(typename _Container::const_reference __value)
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{
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container->push_back(__value);
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return *this;
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}
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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back_insert_iterator&
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operator=(typename _Container::value_type&& __value)
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{
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container->push_back(std::move(__value));
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return *this;
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}
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#endif
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/// Simply returns *this.
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back_insert_iterator&
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operator*()
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{ return *this; }
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/// Simply returns *this. (This %iterator does not "move".)
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back_insert_iterator&
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operator++()
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{ return *this; }
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/// Simply returns *this. (This %iterator does not "move".)
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back_insert_iterator
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operator++(int)
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{ return *this; }
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};
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/**
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* @param x A container of arbitrary type.
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* @return An instance of back_insert_iterator working on @p x.
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*
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* This wrapper function helps in creating back_insert_iterator instances.
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* Typing the name of the %iterator requires knowing the precise full
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* type of the container, which can be tedious and impedes generic
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* programming. Using this function lets you take advantage of automatic
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* template parameter deduction, making the compiler match the correct
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* types for you.
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*/
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template<typename _Container>
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inline back_insert_iterator<_Container>
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back_inserter(_Container& __x)
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{ return back_insert_iterator<_Container>(__x); }
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|
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/**
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* @brief Turns assignment into insertion.
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*
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* These are output iterators, constructed from a container-of-T.
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* Assigning a T to the iterator prepends it to the container using
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* push_front.
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*
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* Tip: Using the front_inserter function to create these iterators can
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* save typing.
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*/
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template<typename _Container>
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class front_insert_iterator
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: public iterator<output_iterator_tag, void, void, void, void>
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{
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protected:
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_Container* container;
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public:
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/// A nested typedef for the type of whatever container you used.
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typedef _Container container_type;
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/// The only way to create this %iterator is with a container.
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explicit front_insert_iterator(_Container& __x) : container(&__x) { }
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/**
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* @param value An instance of whatever type
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* container_type::const_reference is; presumably a
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* reference-to-const T for container<T>.
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* @return This %iterator, for chained operations.
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*
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* This kind of %iterator doesn't really have a "position" in the
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* container (you can think of the position as being permanently at
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* the front, if you like). Assigning a value to the %iterator will
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* always prepend the value to the front of the container.
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*/
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front_insert_iterator&
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operator=(typename _Container::const_reference __value)
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{
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container->push_front(__value);
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return *this;
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}
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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front_insert_iterator&
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operator=(typename _Container::value_type&& __value)
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{
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container->push_front(std::move(__value));
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return *this;
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}
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#endif
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/// Simply returns *this.
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front_insert_iterator&
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operator*()
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{ return *this; }
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/// Simply returns *this. (This %iterator does not "move".)
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front_insert_iterator&
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operator++()
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{ return *this; }
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/// Simply returns *this. (This %iterator does not "move".)
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|
front_insert_iterator
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operator++(int)
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{ return *this; }
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};
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|
|
/**
|
|
* @param x A container of arbitrary type.
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|
* @return An instance of front_insert_iterator working on @p x.
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|
*
|
|
* This wrapper function helps in creating front_insert_iterator instances.
|
|
* Typing the name of the %iterator requires knowing the precise full
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|
* type of the container, which can be tedious and impedes generic
|
|
* programming. Using this function lets you take advantage of automatic
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|
* template parameter deduction, making the compiler match the correct
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* types for you.
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|
*/
|
|
template<typename _Container>
|
|
inline front_insert_iterator<_Container>
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front_inserter(_Container& __x)
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{ return front_insert_iterator<_Container>(__x); }
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|
|
/**
|
|
* @brief Turns assignment into insertion.
|
|
*
|
|
* These are output iterators, constructed from a container-of-T.
|
|
* Assigning a T to the iterator inserts it in the container at the
|
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* %iterator's position, rather than overwriting the value at that
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* position.
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*
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|
* (Sequences will actually insert a @e copy of the value before the
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* %iterator's position.)
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*
|
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* Tip: Using the inserter function to create these iterators can
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* save typing.
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|
*/
|
|
template<typename _Container>
|
|
class insert_iterator
|
|
: public iterator<output_iterator_tag, void, void, void, void>
|
|
{
|
|
protected:
|
|
_Container* container;
|
|
typename _Container::iterator iter;
|
|
|
|
public:
|
|
/// A nested typedef for the type of whatever container you used.
|
|
typedef _Container container_type;
|
|
|
|
/**
|
|
* The only way to create this %iterator is with a container and an
|
|
* initial position (a normal %iterator into the container).
|
|
*/
|
|
insert_iterator(_Container& __x, typename _Container::iterator __i)
|
|
: container(&__x), iter(__i) {}
|
|
|
|
/**
|
|
* @param value An instance of whatever type
|
|
* container_type::const_reference is; presumably a
|
|
* reference-to-const T for container<T>.
|
|
* @return This %iterator, for chained operations.
|
|
*
|
|
* This kind of %iterator maintains its own position in the
|
|
* container. Assigning a value to the %iterator will insert the
|
|
* value into the container at the place before the %iterator.
|
|
*
|
|
* The position is maintained such that subsequent assignments will
|
|
* insert values immediately after one another. For example,
|
|
* @code
|
|
* // vector v contains A and Z
|
|
*
|
|
* insert_iterator i (v, ++v.begin());
|
|
* i = 1;
|
|
* i = 2;
|
|
* i = 3;
|
|
*
|
|
* // vector v contains A, 1, 2, 3, and Z
|
|
* @endcode
|
|
*/
|
|
insert_iterator&
|
|
operator=(typename _Container::const_reference __value)
|
|
{
|
|
iter = container->insert(iter, __value);
|
|
++iter;
|
|
return *this;
|
|
}
|
|
|
|
#ifdef __GXX_EXPERIMENTAL_CXX0X__
|
|
insert_iterator&
|
|
operator=(typename _Container::value_type&& __value)
|
|
{
|
|
iter = container->insert(iter, std::move(__value));
|
|
++iter;
|
|
return *this;
|
|
}
|
|
#endif
|
|
|
|
/// Simply returns *this.
|
|
insert_iterator&
|
|
operator*()
|
|
{ return *this; }
|
|
|
|
/// Simply returns *this. (This %iterator does not "move".)
|
|
insert_iterator&
|
|
operator++()
|
|
{ return *this; }
|
|
|
|
/// Simply returns *this. (This %iterator does not "move".)
|
|
insert_iterator&
|
|
operator++(int)
|
|
{ return *this; }
|
|
};
|
|
|
|
/**
|
|
* @param x A container of arbitrary type.
|
|
* @return An instance of insert_iterator working on @p x.
|
|
*
|
|
* This wrapper function helps in creating insert_iterator instances.
|
|
* Typing the name of the %iterator requires knowing the precise full
|
|
* type of the container, which can be tedious and impedes generic
|
|
* programming. Using this function lets you take advantage of automatic
|
|
* template parameter deduction, making the compiler match the correct
|
|
* types for you.
|
|
*/
|
|
template<typename _Container, typename _Iterator>
|
|
inline insert_iterator<_Container>
|
|
inserter(_Container& __x, _Iterator __i)
|
|
{
|
|
return insert_iterator<_Container>(__x,
|
|
typename _Container::iterator(__i));
|
|
}
|
|
|
|
_GLIBCXX_END_NAMESPACE
|
|
|
|
_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
|
|
|
|
// This iterator adapter is 'normal' in the sense that it does not
|
|
// change the semantics of any of the operators of its iterator
|
|
// parameter. Its primary purpose is to convert an iterator that is
|
|
// not a class, e.g. a pointer, into an iterator that is a class.
|
|
// The _Container parameter exists solely so that different containers
|
|
// using this template can instantiate different types, even if the
|
|
// _Iterator parameter is the same.
|
|
using std::iterator_traits;
|
|
using std::iterator;
|
|
template<typename _Iterator, typename _Container>
|
|
class __normal_iterator
|
|
{
|
|
protected:
|
|
_Iterator _M_current;
|
|
|
|
public:
|
|
typedef _Iterator iterator_type;
|
|
typedef typename iterator_traits<_Iterator>::iterator_category
|
|
iterator_category;
|
|
typedef typename iterator_traits<_Iterator>::value_type value_type;
|
|
typedef typename iterator_traits<_Iterator>::difference_type
|
|
difference_type;
|
|
typedef typename iterator_traits<_Iterator>::reference reference;
|
|
typedef typename iterator_traits<_Iterator>::pointer pointer;
|
|
|
|
__normal_iterator() : _M_current(_Iterator()) { }
|
|
|
|
explicit
|
|
__normal_iterator(const _Iterator& __i) : _M_current(__i) { }
|
|
|
|
// Allow iterator to const_iterator conversion
|
|
template<typename _Iter>
|
|
__normal_iterator(const __normal_iterator<_Iter,
|
|
typename __enable_if<
|
|
(std::__are_same<_Iter, typename _Container::pointer>::__value),
|
|
_Container>::__type>& __i)
|
|
: _M_current(__i.base()) { }
|
|
|
|
// Forward iterator requirements
|
|
reference
|
|
operator*() const
|
|
{ return *_M_current; }
|
|
|
|
pointer
|
|
operator->() const
|
|
{ return _M_current; }
|
|
|
|
__normal_iterator&
|
|
operator++()
|
|
{
|
|
++_M_current;
|
|
return *this;
|
|
}
|
|
|
|
__normal_iterator
|
|
operator++(int)
|
|
{ return __normal_iterator(_M_current++); }
|
|
|
|
// Bidirectional iterator requirements
|
|
__normal_iterator&
|
|
operator--()
|
|
{
|
|
--_M_current;
|
|
return *this;
|
|
}
|
|
|
|
__normal_iterator
|
|
operator--(int)
|
|
{ return __normal_iterator(_M_current--); }
|
|
|
|
// Random access iterator requirements
|
|
reference
|
|
operator[](const difference_type& __n) const
|
|
{ return _M_current[__n]; }
|
|
|
|
__normal_iterator&
|
|
operator+=(const difference_type& __n)
|
|
{ _M_current += __n; return *this; }
|
|
|
|
__normal_iterator
|
|
operator+(const difference_type& __n) const
|
|
{ return __normal_iterator(_M_current + __n); }
|
|
|
|
__normal_iterator&
|
|
operator-=(const difference_type& __n)
|
|
{ _M_current -= __n; return *this; }
|
|
|
|
__normal_iterator
|
|
operator-(const difference_type& __n) const
|
|
{ return __normal_iterator(_M_current - __n); }
|
|
|
|
const _Iterator&
|
|
base() const
|
|
{ return _M_current; }
|
|
};
|
|
|
|
// Note: In what follows, the left- and right-hand-side iterators are
|
|
// allowed to vary in types (conceptually in cv-qualification) so that
|
|
// comparaison between cv-qualified and non-cv-qualified iterators be
|
|
// valid. However, the greedy and unfriendly operators in std::rel_ops
|
|
// will make overload resolution ambiguous (when in scope) if we don't
|
|
// provide overloads whose operands are of the same type. Can someone
|
|
// remind me what generic programming is about? -- Gaby
|
|
|
|
// Forward iterator requirements
|
|
template<typename _IteratorL, typename _IteratorR, typename _Container>
|
|
inline bool
|
|
operator==(const __normal_iterator<_IteratorL, _Container>& __lhs,
|
|
const __normal_iterator<_IteratorR, _Container>& __rhs)
|
|
{ return __lhs.base() == __rhs.base(); }
|
|
|
|
template<typename _Iterator, typename _Container>
|
|
inline bool
|
|
operator==(const __normal_iterator<_Iterator, _Container>& __lhs,
|
|
const __normal_iterator<_Iterator, _Container>& __rhs)
|
|
{ return __lhs.base() == __rhs.base(); }
|
|
|
|
template<typename _IteratorL, typename _IteratorR, typename _Container>
|
|
inline bool
|
|
operator!=(const __normal_iterator<_IteratorL, _Container>& __lhs,
|
|
const __normal_iterator<_IteratorR, _Container>& __rhs)
|
|
{ return __lhs.base() != __rhs.base(); }
|
|
|
|
template<typename _Iterator, typename _Container>
|
|
inline bool
|
|
operator!=(const __normal_iterator<_Iterator, _Container>& __lhs,
|
|
const __normal_iterator<_Iterator, _Container>& __rhs)
|
|
{ return __lhs.base() != __rhs.base(); }
|
|
|
|
// Random access iterator requirements
|
|
template<typename _IteratorL, typename _IteratorR, typename _Container>
|
|
inline bool
|
|
operator<(const __normal_iterator<_IteratorL, _Container>& __lhs,
|
|
const __normal_iterator<_IteratorR, _Container>& __rhs)
|
|
{ return __lhs.base() < __rhs.base(); }
|
|
|
|
template<typename _Iterator, typename _Container>
|
|
inline bool
|
|
operator<(const __normal_iterator<_Iterator, _Container>& __lhs,
|
|
const __normal_iterator<_Iterator, _Container>& __rhs)
|
|
{ return __lhs.base() < __rhs.base(); }
|
|
|
|
template<typename _IteratorL, typename _IteratorR, typename _Container>
|
|
inline bool
|
|
operator>(const __normal_iterator<_IteratorL, _Container>& __lhs,
|
|
const __normal_iterator<_IteratorR, _Container>& __rhs)
|
|
{ return __lhs.base() > __rhs.base(); }
|
|
|
|
template<typename _Iterator, typename _Container>
|
|
inline bool
|
|
operator>(const __normal_iterator<_Iterator, _Container>& __lhs,
|
|
const __normal_iterator<_Iterator, _Container>& __rhs)
|
|
{ return __lhs.base() > __rhs.base(); }
|
|
|
|
template<typename _IteratorL, typename _IteratorR, typename _Container>
|
|
inline bool
|
|
operator<=(const __normal_iterator<_IteratorL, _Container>& __lhs,
|
|
const __normal_iterator<_IteratorR, _Container>& __rhs)
|
|
{ return __lhs.base() <= __rhs.base(); }
|
|
|
|
template<typename _Iterator, typename _Container>
|
|
inline bool
|
|
operator<=(const __normal_iterator<_Iterator, _Container>& __lhs,
|
|
const __normal_iterator<_Iterator, _Container>& __rhs)
|
|
{ return __lhs.base() <= __rhs.base(); }
|
|
|
|
template<typename _IteratorL, typename _IteratorR, typename _Container>
|
|
inline bool
|
|
operator>=(const __normal_iterator<_IteratorL, _Container>& __lhs,
|
|
const __normal_iterator<_IteratorR, _Container>& __rhs)
|
|
{ return __lhs.base() >= __rhs.base(); }
|
|
|
|
template<typename _Iterator, typename _Container>
|
|
inline bool
|
|
operator>=(const __normal_iterator<_Iterator, _Container>& __lhs,
|
|
const __normal_iterator<_Iterator, _Container>& __rhs)
|
|
{ return __lhs.base() >= __rhs.base(); }
|
|
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
// According to the resolution of DR179 not only the various comparison
|
|
// operators but also operator- must accept mixed iterator/const_iterator
|
|
// parameters.
|
|
template<typename _IteratorL, typename _IteratorR, typename _Container>
|
|
inline typename __normal_iterator<_IteratorL, _Container>::difference_type
|
|
operator-(const __normal_iterator<_IteratorL, _Container>& __lhs,
|
|
const __normal_iterator<_IteratorR, _Container>& __rhs)
|
|
{ return __lhs.base() - __rhs.base(); }
|
|
|
|
template<typename _Iterator, typename _Container>
|
|
inline typename __normal_iterator<_Iterator, _Container>::difference_type
|
|
operator-(const __normal_iterator<_Iterator, _Container>& __lhs,
|
|
const __normal_iterator<_Iterator, _Container>& __rhs)
|
|
{ return __lhs.base() - __rhs.base(); }
|
|
|
|
template<typename _Iterator, typename _Container>
|
|
inline __normal_iterator<_Iterator, _Container>
|
|
operator+(typename __normal_iterator<_Iterator, _Container>::difference_type
|
|
__n, const __normal_iterator<_Iterator, _Container>& __i)
|
|
{ return __normal_iterator<_Iterator, _Container>(__i.base() + __n); }
|
|
|
|
_GLIBCXX_END_NAMESPACE
|
|
|
|
#ifdef __GXX_EXPERIMENTAL_CXX0X__
|
|
|
|
_GLIBCXX_BEGIN_NAMESPACE(std)
|
|
|
|
// 24.4.3 Move iterators
|
|
/**
|
|
* @if maint
|
|
* Class template move_iterator is an iterator adapter with the same
|
|
* behavior as the underlying iterator except that its dereference
|
|
* operator implicitly converts the value returned by the underlying
|
|
* iterator's dereference operator to an rvalue reference. Some
|
|
* generic algorithms can be called with move iterators to replace
|
|
* copying with moving.
|
|
* @endif
|
|
*/
|
|
template<typename _Iterator>
|
|
class move_iterator
|
|
{
|
|
protected:
|
|
_Iterator _M_current;
|
|
|
|
public:
|
|
typedef _Iterator iterator_type;
|
|
typedef typename iterator_traits<_Iterator>::difference_type
|
|
difference_type;
|
|
// NB: DR 680.
|
|
typedef _Iterator pointer;
|
|
typedef typename iterator_traits<_Iterator>::value_type value_type;
|
|
typedef typename iterator_traits<_Iterator>::iterator_category
|
|
iterator_category;
|
|
typedef value_type&& reference;
|
|
|
|
public:
|
|
move_iterator()
|
|
: _M_current() { }
|
|
|
|
explicit
|
|
move_iterator(iterator_type __i)
|
|
: _M_current(__i) { }
|
|
|
|
template<typename _Iter>
|
|
move_iterator(const move_iterator<_Iter>& __i)
|
|
: _M_current(__i.base()) { }
|
|
|
|
iterator_type
|
|
base() const
|
|
{ return _M_current; }
|
|
|
|
reference
|
|
operator*() const
|
|
{ return *_M_current; }
|
|
|
|
pointer
|
|
operator->() const
|
|
{ return _M_current; }
|
|
|
|
move_iterator&
|
|
operator++()
|
|
{
|
|
++_M_current;
|
|
return *this;
|
|
}
|
|
|
|
move_iterator
|
|
operator++(int)
|
|
{
|
|
move_iterator __tmp = *this;
|
|
++_M_current;
|
|
return __tmp;
|
|
}
|
|
|
|
move_iterator&
|
|
operator--()
|
|
{
|
|
--_M_current;
|
|
return *this;
|
|
}
|
|
|
|
move_iterator
|
|
operator--(int)
|
|
{
|
|
move_iterator __tmp = *this;
|
|
--_M_current;
|
|
return __tmp;
|
|
}
|
|
|
|
move_iterator
|
|
operator+(difference_type __n) const
|
|
{ return move_iterator(_M_current + __n); }
|
|
|
|
move_iterator&
|
|
operator+=(difference_type __n)
|
|
{
|
|
_M_current += __n;
|
|
return *this;
|
|
}
|
|
|
|
move_iterator
|
|
operator-(difference_type __n) const
|
|
{ return move_iterator(_M_current - __n); }
|
|
|
|
move_iterator&
|
|
operator-=(difference_type __n)
|
|
{
|
|
_M_current -= __n;
|
|
return *this;
|
|
}
|
|
|
|
reference
|
|
operator[](difference_type __n) const
|
|
{ return _M_current[__n]; }
|
|
};
|
|
|
|
template<typename _IteratorL, typename _IteratorR>
|
|
inline bool
|
|
operator==(const move_iterator<_IteratorL>& __x,
|
|
const move_iterator<_IteratorR>& __y)
|
|
{ return __x.base() == __y.base(); }
|
|
|
|
template<typename _IteratorL, typename _IteratorR>
|
|
inline bool
|
|
operator!=(const move_iterator<_IteratorL>& __x,
|
|
const move_iterator<_IteratorR>& __y)
|
|
{ return !(__x == __y); }
|
|
|
|
template<typename _IteratorL, typename _IteratorR>
|
|
inline bool
|
|
operator<(const move_iterator<_IteratorL>& __x,
|
|
const move_iterator<_IteratorR>& __y)
|
|
{ return __x.base() < __y.base(); }
|
|
|
|
template<typename _IteratorL, typename _IteratorR>
|
|
inline bool
|
|
operator<=(const move_iterator<_IteratorL>& __x,
|
|
const move_iterator<_IteratorR>& __y)
|
|
{ return !(__y < __x); }
|
|
|
|
template<typename _IteratorL, typename _IteratorR>
|
|
inline bool
|
|
operator>(const move_iterator<_IteratorL>& __x,
|
|
const move_iterator<_IteratorR>& __y)
|
|
{ return __y < __x; }
|
|
|
|
template<typename _IteratorL, typename _IteratorR>
|
|
inline bool
|
|
operator>=(const move_iterator<_IteratorL>& __x,
|
|
const move_iterator<_IteratorR>& __y)
|
|
{ return !(__x < __y); }
|
|
|
|
template<typename _IteratorL, typename _IteratorR>
|
|
inline typename move_iterator<_IteratorL>::difference_type
|
|
operator-(const move_iterator<_IteratorL>& __x,
|
|
const move_iterator<_IteratorR>& __y)
|
|
{ return __x.base() - __y.base(); }
|
|
|
|
template<typename _Iterator>
|
|
inline move_iterator<_Iterator>
|
|
operator+(typename move_iterator<_Iterator>::difference_type __n,
|
|
const move_iterator<_Iterator>& __x)
|
|
{ return __x + __n; }
|
|
|
|
template<typename _Iterator>
|
|
inline move_iterator<_Iterator>
|
|
make_move_iterator(const _Iterator& __i)
|
|
{ return move_iterator<_Iterator>(__i); }
|
|
|
|
_GLIBCXX_END_NAMESPACE
|
|
|
|
#define _GLIBCXX_MAKE_MOVE_ITERATOR(_Iter) std::make_move_iterator(_Iter)
|
|
#else
|
|
#define _GLIBCXX_MAKE_MOVE_ITERATOR(_Iter) (_Iter)
|
|
#endif // __GXX_EXPERIMENTAL_CXX0X__
|
|
|
|
#endif
|