stl_iterator.h
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// Iterators -*- C++ -*- // Copyright (C) 2001-2018 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /* * * Copyright (c) 1994 * Hewlett-Packard Company * * Permission to use, copy, modify, distribute and sell this software * and its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appear in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation. Hewlett-Packard Company makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied warranty. * * * Copyright (c) 1996-1998 * Silicon Graphics Computer Systems, Inc. * * Permission to use, copy, modify, distribute and sell this software * and its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appear in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation. Silicon Graphics makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied warranty. */ /** @file bits/stl_iterator.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{iterator} * * This file implements reverse_iterator, back_insert_iterator, * front_insert_iterator, insert_iterator, __normal_iterator, and their * supporting functions and overloaded operators. */ #ifndef _STL_ITERATOR_H #define _STL_ITERATOR_H 1 #include <bits/cpp_type_traits.h> #include <ext/type_traits.h> #include <bits/move.h> #include <bits/ptr_traits.h> #if __cplusplus > 201402L # define __cpp_lib_array_constexpr 201603 #endif namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /** * @addtogroup iterators * @{ */ // 24.4.1 Reverse iterators /** * Bidirectional and random access iterators have corresponding reverse * %iterator adaptors that iterate through the data structure in the * opposite direction. They have the same signatures as the corresponding * iterators. The fundamental relation between a reverse %iterator and its * corresponding %iterator @c i is established by the identity: * @code * &*(reverse_iterator(i)) == &*(i - 1) * @endcode * * <em>This mapping is dictated by the fact that while there is always a * pointer past the end of an array, there might not be a valid pointer * before the beginning of an array.</em> [24.4.1]/1,2 * * Reverse iterators can be tricky and surprising at first. Their * semantics make sense, however, and the trickiness is a side effect of * the requirement that the iterators must be safe. */ template<typename _Iterator> class reverse_iterator : public iterator<typename iterator_traits<_Iterator>::iterator_category, typename iterator_traits<_Iterator>::value_type, typename iterator_traits<_Iterator>::difference_type, typename iterator_traits<_Iterator>::pointer, typename iterator_traits<_Iterator>::reference> { protected: _Iterator current; typedef iterator_traits<_Iterator> __traits_type; public: typedef _Iterator iterator_type; typedef typename __traits_type::difference_type difference_type; typedef typename __traits_type::pointer pointer; typedef typename __traits_type::reference reference; /** * The default constructor value-initializes member @p current. * If it is a pointer, that means it is zero-initialized. */ // _GLIBCXX_RESOLVE_LIB_DEFECTS // 235 No specification of default ctor for reverse_iterator // 1012. reverse_iterator default ctor should value initialize _GLIBCXX17_CONSTEXPR reverse_iterator() : current() { } /** * This %iterator will move in the opposite direction that @p x does. */ explicit _GLIBCXX17_CONSTEXPR reverse_iterator(iterator_type __x) : current(__x) { } /** * The copy constructor is normal. */ _GLIBCXX17_CONSTEXPR reverse_iterator(const reverse_iterator& __x) : current(__x.current) { } /** * A %reverse_iterator across other types can be copied if the * underlying %iterator can be converted to the type of @c current. */ template<typename _Iter> _GLIBCXX17_CONSTEXPR reverse_iterator(const reverse_iterator<_Iter>& __x) : current(__x.base()) { } /** * @return @c current, the %iterator used for underlying work. */ _GLIBCXX17_CONSTEXPR iterator_type base() const { return current; } /** * @return A reference to the value at @c --current * * This requires that @c --current is dereferenceable. * * @warning This implementation requires that for an iterator of the * underlying iterator type, @c x, a reference obtained by * @c *x remains valid after @c x has been modified or * destroyed. This is a bug: http://gcc.gnu.org/PR51823 */ _GLIBCXX17_CONSTEXPR reference operator*() const { _Iterator __tmp = current; return *--__tmp; } /** * @return A pointer to the value at @c --current * * This requires that @c --current is dereferenceable. */ // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2188. Reverse iterator does not fully support targets that overload & _GLIBCXX17_CONSTEXPR pointer operator->() const { return std::__addressof(operator*()); } /** * @return @c *this * * Decrements the underlying iterator. */ _GLIBCXX17_CONSTEXPR reverse_iterator& operator++() { --current; return *this; } /** * @return The original value of @c *this * * Decrements the underlying iterator. */ _GLIBCXX17_CONSTEXPR reverse_iterator operator++(int) { reverse_iterator __tmp = *this; --current; return __tmp; } /** * @return @c *this * * Increments the underlying iterator. */ _GLIBCXX17_CONSTEXPR reverse_iterator& operator--() { ++current; return *this; } /** * @return A reverse_iterator with the previous value of @c *this * * Increments the underlying iterator. */ _GLIBCXX17_CONSTEXPR reverse_iterator operator--(int) { reverse_iterator __tmp = *this; ++current; return __tmp; } /** * @return A reverse_iterator that refers to @c current - @a __n * * The underlying iterator must be a Random Access Iterator. */ _GLIBCXX17_CONSTEXPR reverse_iterator operator+(difference_type __n) const { return reverse_iterator(current - __n); } /** * @return *this * * Moves the underlying iterator backwards @a __n steps. * The underlying iterator must be a Random Access Iterator. */ _GLIBCXX17_CONSTEXPR reverse_iterator& operator+=(difference_type __n) { current -= __n; return *this; } /** * @return A reverse_iterator that refers to @c current - @a __n * * The underlying iterator must be a Random Access Iterator. */ _GLIBCXX17_CONSTEXPR reverse_iterator operator-(difference_type __n) const { return reverse_iterator(current + __n); } /** * @return *this * * Moves the underlying iterator forwards @a __n steps. * The underlying iterator must be a Random Access Iterator. */ _GLIBCXX17_CONSTEXPR reverse_iterator& operator-=(difference_type __n) { current += __n; return *this; } /** * @return The value at @c current - @a __n - 1 * * The underlying iterator must be a Random Access Iterator. */ _GLIBCXX17_CONSTEXPR reference operator[](difference_type __n) const { return *(*this + __n); } }; //@{ /** * @param __x A %reverse_iterator. * @param __y A %reverse_iterator. * @return A simple bool. * * Reverse iterators forward many operations to their underlying base() * iterators. Others are implemented in terms of one another. * */ template<typename _Iterator> inline _GLIBCXX17_CONSTEXPR bool operator==(const reverse_iterator<_Iterator>& __x, const reverse_iterator<_Iterator>& __y) { return __x.base() == __y.base(); } template<typename _Iterator> inline _GLIBCXX17_CONSTEXPR bool operator<(const reverse_iterator<_Iterator>& __x, const reverse_iterator<_Iterator>& __y) { return __y.base() < __x.base(); } template<typename _Iterator> inline _GLIBCXX17_CONSTEXPR bool operator!=(const reverse_iterator<_Iterator>& __x, const reverse_iterator<_Iterator>& __y) { return !(__x == __y); } template<typename _Iterator> inline _GLIBCXX17_CONSTEXPR bool operator>(const reverse_iterator<_Iterator>& __x, const reverse_iterator<_Iterator>& __y) { return __y < __x; } template<typename _Iterator> inline _GLIBCXX17_CONSTEXPR bool operator<=(const reverse_iterator<_Iterator>& __x, const reverse_iterator<_Iterator>& __y) { return !(__y < __x); } template<typename _Iterator> inline _GLIBCXX17_CONSTEXPR bool operator>=(const reverse_iterator<_Iterator>& __x, const reverse_iterator<_Iterator>& __y) { return !(__x < __y); } // _GLIBCXX_RESOLVE_LIB_DEFECTS // DR 280. Comparison of reverse_iterator to const reverse_iterator. template<typename _IteratorL, typename _IteratorR> inline _GLIBCXX17_CONSTEXPR bool operator==(const reverse_iterator<_IteratorL>& __x, const reverse_iterator<_IteratorR>& __y) { return __x.base() == __y.base(); } template<typename _IteratorL, typename _IteratorR> inline _GLIBCXX17_CONSTEXPR bool operator<(const reverse_iterator<_IteratorL>& __x, const reverse_iterator<_IteratorR>& __y) { return __y.base() < __x.base(); } template<typename _IteratorL, typename _IteratorR> inline _GLIBCXX17_CONSTEXPR bool operator!=(const reverse_iterator<_IteratorL>& __x, const reverse_iterator<_IteratorR>& __y) { return !(__x == __y); } template<typename _IteratorL, typename _IteratorR> inline _GLIBCXX17_CONSTEXPR bool operator>(const reverse_iterator<_IteratorL>& __x, const reverse_iterator<_IteratorR>& __y) { return __y < __x; } template<typename _IteratorL, typename _IteratorR> inline _GLIBCXX17_CONSTEXPR bool operator<=(const reverse_iterator<_IteratorL>& __x, const reverse_iterator<_IteratorR>& __y) { return !(__y < __x); } template<typename _IteratorL, typename _IteratorR> inline _GLIBCXX17_CONSTEXPR bool operator>=(const reverse_iterator<_IteratorL>& __x, const reverse_iterator<_IteratorR>& __y) { return !(__x < __y); } //@} #if __cplusplus < 201103L template<typename _Iterator> inline typename reverse_iterator<_Iterator>::difference_type operator-(const reverse_iterator<_Iterator>& __x, const reverse_iterator<_Iterator>& __y) { return __y.base() - __x.base(); } template<typename _IteratorL, typename _IteratorR> inline typename reverse_iterator<_IteratorL>::difference_type operator-(const reverse_iterator<_IteratorL>& __x, const reverse_iterator<_IteratorR>& __y) { return __y.base() - __x.base(); } #else // _GLIBCXX_RESOLVE_LIB_DEFECTS // DR 685. reverse_iterator/move_iterator difference has invalid signatures template<typename _IteratorL, typename _IteratorR> inline _GLIBCXX17_CONSTEXPR auto operator-(const reverse_iterator<_IteratorL>& __x, const reverse_iterator<_IteratorR>& __y) -> decltype(__y.base() - __x.base()) { return __y.base() - __x.base(); } #endif template<typename _Iterator> inline _GLIBCXX17_CONSTEXPR reverse_iterator<_Iterator> operator+(typename reverse_iterator<_Iterator>::difference_type __n, const reverse_iterator<_Iterator>& __x) { return reverse_iterator<_Iterator>(__x.base() - __n); } #if __cplusplus >= 201103L // Same as C++14 make_reverse_iterator but used in C++03 mode too. template<typename _Iterator> inline _GLIBCXX17_CONSTEXPR reverse_iterator<_Iterator> __make_reverse_iterator(_Iterator __i) { return reverse_iterator<_Iterator>(__i); } # if __cplusplus > 201103L # define __cpp_lib_make_reverse_iterator 201402 // _GLIBCXX_RESOLVE_LIB_DEFECTS // DR 2285. make_reverse_iterator /// Generator function for reverse_iterator. template<typename _Iterator> inline _GLIBCXX17_CONSTEXPR reverse_iterator<_Iterator> make_reverse_iterator(_Iterator __i) { return reverse_iterator<_Iterator>(__i); } # endif #endif #if __cplusplus >= 201103L template<typename _Iterator> auto __niter_base(reverse_iterator<_Iterator> __it) -> decltype(__make_reverse_iterator(__niter_base(__it.base()))) { return __make_reverse_iterator(__niter_base(__it.base())); } template<typename _Iterator> struct __is_move_iterator<reverse_iterator<_Iterator> > : __is_move_iterator<_Iterator> { }; template<typename _Iterator> auto __miter_base(reverse_iterator<_Iterator> __it) -> decltype(__make_reverse_iterator(__miter_base(__it.base()))) { return __make_reverse_iterator(__miter_base(__it.base())); } #endif // 24.4.2.2.1 back_insert_iterator /** * @brief Turns assignment into insertion. * * These are output iterators, constructed from a container-of-T. * Assigning a T to the iterator appends it to the container using * push_back. * * Tip: Using the back_inserter function to create these iterators can * save typing. */ template<typename _Container> class back_insert_iterator : public iterator<output_iterator_tag, void, void, void, void> { protected: _Container* container; 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. explicit back_insert_iterator(_Container& __x) : container(std::__addressof(__x)) { } /** * @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 doesn't really have a @a position in the * container (you can think of the position as being permanently at * the end, if you like). Assigning a value to the %iterator will * always append the value to the end of the container. */ #if __cplusplus < 201103L back_insert_iterator& operator=(typename _Container::const_reference __value) { container->push_back(__value); return *this; } #else back_insert_iterator& operator=(const typename _Container::value_type& __value) { container->push_back(__value); return *this; } back_insert_iterator& operator=(typename _Container::value_type&& __value) { container->push_back(std::move(__value)); return *this; } #endif /// Simply returns *this. back_insert_iterator& operator*() { return *this; } /// Simply returns *this. (This %iterator does not @a move.) back_insert_iterator& operator++() { return *this; } /// Simply returns *this. (This %iterator does not @a move.) back_insert_iterator operator++(int) { return *this; } }; /** * @param __x A container of arbitrary type. * @return An instance of back_insert_iterator working on @p __x. * * This wrapper function helps in creating back_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> inline back_insert_iterator<_Container> back_inserter(_Container& __x) { return back_insert_iterator<_Container>(__x); } /** * @brief Turns assignment into insertion. * * These are output iterators, constructed from a container-of-T. * Assigning a T to the iterator prepends it to the container using * push_front. * * Tip: Using the front_inserter function to create these iterators can * save typing. */ template<typename _Container> class front_insert_iterator : public iterator<output_iterator_tag, void, void, void, void> { protected: _Container* container; 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. explicit front_insert_iterator(_Container& __x) : container(std::__addressof(__x)) { } /** * @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 doesn't really have a @a position in the * container (you can think of the position as being permanently at * the front, if you like). Assigning a value to the %iterator will * always prepend the value to the front of the container. */ #if __cplusplus < 201103L front_insert_iterator& operator=(typename _Container::const_reference __value) { container->push_front(__value); return *this; } #else front_insert_iterator& operator=(const typename _Container::value_type& __value) { container->push_front(__value); return *this; } front_insert_iterator& operator=(typename _Container::value_type&& __value) { container->push_front(std::move(__value)); return *this; } #endif /// Simply returns *this. front_insert_iterator& operator*() { return *this; } /// Simply returns *this. (This %iterator does not @a move.) front_insert_iterator& operator++() { return *this; } /// Simply returns *this. (This %iterator does not @a move.) front_insert_iterator operator++(int) { return *this; } }; /** * @param __x A container of arbitrary type. * @return An instance of front_insert_iterator working on @p x. * * This wrapper function helps in creating front_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> inline front_insert_iterator<_Container> front_inserter(_Container& __x) { return front_insert_iterator<_Container>(__x); } /** * @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 * %iterator's position, rather than overwriting the value at that * position. * * (Sequences will actually insert a @e copy of the value before the * %iterator's position.) * * Tip: Using the inserter function to create these iterators can * save typing. */ 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(std::__addressof(__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 */ #if __cplusplus < 201103L insert_iterator& operator=(typename _Container::const_reference __value) { iter = container->insert(iter, __value); ++iter; return *this; } #else insert_iterator& operator=(const typename _Container::value_type& __value) { iter = container->insert(iter, __value); ++iter; return *this; } 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 @a move.) insert_iterator& operator++() { return *this; } /// Simply returns *this. (This %iterator does not @a move.) insert_iterator& operator++(int) { return *this; } }; /** * @param __x A container of arbitrary type. * @param __i An iterator into the container. * @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)); } // @} group iterators _GLIBCXX_END_NAMESPACE_VERSION } // namespace namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION // This iterator adapter is @a 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; typedef iterator_traits<_Iterator> __traits_type; public: typedef _Iterator iterator_type; typedef typename __traits_type::iterator_category iterator_category; typedef typename __traits_type::value_type value_type; typedef typename __traits_type::difference_type difference_type; typedef typename __traits_type::reference reference; typedef typename __traits_type::pointer pointer; _GLIBCXX_CONSTEXPR __normal_iterator() _GLIBCXX_NOEXCEPT : _M_current(_Iterator()) { } explicit __normal_iterator(const _Iterator& __i) _GLIBCXX_NOEXCEPT : _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) _GLIBCXX_NOEXCEPT : _M_current(__i.base()) { } // Forward iterator requirements reference operator*() const _GLIBCXX_NOEXCEPT { return *_M_current; } pointer operator->() const _GLIBCXX_NOEXCEPT { return _M_current; } __normal_iterator& operator++() _GLIBCXX_NOEXCEPT { ++_M_current; return *this; } __normal_iterator operator++(int) _GLIBCXX_NOEXCEPT { return __normal_iterator(_M_current++); } // Bidirectional iterator requirements __normal_iterator& operator--() _GLIBCXX_NOEXCEPT { --_M_current; return *this; } __normal_iterator operator--(int) _GLIBCXX_NOEXCEPT { return __normal_iterator(_M_current--); } // Random access iterator requirements reference operator[](difference_type __n) const _GLIBCXX_NOEXCEPT { return _M_current[__n]; } __normal_iterator& operator+=(difference_type __n) _GLIBCXX_NOEXCEPT { _M_current += __n; return *this; } __normal_iterator operator+(difference_type __n) const _GLIBCXX_NOEXCEPT { return __normal_iterator(_M_current + __n); } __normal_iterator& operator-=(difference_type __n) _GLIBCXX_NOEXCEPT { _M_current -= __n; return *this; } __normal_iterator operator-(difference_type __n) const _GLIBCXX_NOEXCEPT { return __normal_iterator(_M_current - __n); } const _Iterator& base() const _GLIBCXX_NOEXCEPT { 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 // comparison 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) _GLIBCXX_NOEXCEPT { 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) _GLIBCXX_NOEXCEPT { 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) _GLIBCXX_NOEXCEPT { 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) _GLIBCXX_NOEXCEPT { 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) _GLIBCXX_NOEXCEPT { 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) _GLIBCXX_NOEXCEPT { 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) _GLIBCXX_NOEXCEPT { 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) _GLIBCXX_NOEXCEPT { 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) _GLIBCXX_NOEXCEPT { 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) _GLIBCXX_NOEXCEPT { 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) _GLIBCXX_NOEXCEPT { 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) _GLIBCXX_NOEXCEPT { 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> #if __cplusplus >= 201103L // DR 685. inline auto operator-(const __normal_iterator<_IteratorL, _Container>& __lhs, const __normal_iterator<_IteratorR, _Container>& __rhs) noexcept -> decltype(__lhs.base() - __rhs.base()) #else inline typename __normal_iterator<_IteratorL, _Container>::difference_type operator-(const __normal_iterator<_IteratorL, _Container>& __lhs, const __normal_iterator<_IteratorR, _Container>& __rhs) #endif { 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) _GLIBCXX_NOEXCEPT { 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) _GLIBCXX_NOEXCEPT { return __normal_iterator<_Iterator, _Container>(__i.base() + __n); } _GLIBCXX_END_NAMESPACE_VERSION } // namespace namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION template<typename _Iterator, typename _Container> _Iterator __niter_base(__gnu_cxx::__normal_iterator<_Iterator, _Container> __it) { return __it.base(); } #if __cplusplus >= 201103L /** * @addtogroup iterators * @{ */ // 24.4.3 Move iterators /** * 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. */ template<typename _Iterator> class move_iterator { protected: _Iterator _M_current; typedef iterator_traits<_Iterator> __traits_type; typedef typename __traits_type::reference __base_ref; public: typedef _Iterator iterator_type; typedef typename __traits_type::iterator_category iterator_category; typedef typename __traits_type::value_type value_type; typedef typename __traits_type::difference_type difference_type; // NB: DR 680. typedef _Iterator pointer; // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2106. move_iterator wrapping iterators returning prvalues typedef typename conditional<is_reference<__base_ref>::value, typename remove_reference<__base_ref>::type&&, __base_ref>::type reference; _GLIBCXX17_CONSTEXPR move_iterator() : _M_current() { } explicit _GLIBCXX17_CONSTEXPR move_iterator(iterator_type __i) : _M_current(__i) { } template<typename _Iter> _GLIBCXX17_CONSTEXPR move_iterator(const move_iterator<_Iter>& __i) : _M_current(__i.base()) { } _GLIBCXX17_CONSTEXPR iterator_type base() const { return _M_current; } _GLIBCXX17_CONSTEXPR reference operator*() const { return static_cast<reference>(*_M_current); } _GLIBCXX17_CONSTEXPR pointer operator->() const { return _M_current; } _GLIBCXX17_CONSTEXPR move_iterator& operator++() { ++_M_current; return *this; } _GLIBCXX17_CONSTEXPR move_iterator operator++(int) { move_iterator __tmp = *this; ++_M_current; return __tmp; } _GLIBCXX17_CONSTEXPR move_iterator& operator--() { --_M_current; return *this; } _GLIBCXX17_CONSTEXPR move_iterator operator--(int) { move_iterator __tmp = *this; --_M_current; return __tmp; } _GLIBCXX17_CONSTEXPR move_iterator operator+(difference_type __n) const { return move_iterator(_M_current + __n); } _GLIBCXX17_CONSTEXPR move_iterator& operator+=(difference_type __n) { _M_current += __n; return *this; } _GLIBCXX17_CONSTEXPR move_iterator operator-(difference_type __n) const { return move_iterator(_M_current - __n); } _GLIBCXX17_CONSTEXPR move_iterator& operator-=(difference_type __n) { _M_current -= __n; return *this; } _GLIBCXX17_CONSTEXPR reference operator[](difference_type __n) const { return std::move(_M_current[__n]); } }; // Note: See __normal_iterator operators note from Gaby to understand // why there are always 2 versions for most of the move_iterator // operators. template<typename _IteratorL, typename _IteratorR> inline _GLIBCXX17_CONSTEXPR bool operator==(const move_iterator<_IteratorL>& __x, const move_iterator<_IteratorR>& __y) { return __x.base() == __y.base(); } template<typename _Iterator> inline _GLIBCXX17_CONSTEXPR bool operator==(const move_iterator<_Iterator>& __x, const move_iterator<_Iterator>& __y) { return __x.base() == __y.base(); } template<typename _IteratorL, typename _IteratorR> inline _GLIBCXX17_CONSTEXPR bool operator!=(const move_iterator<_IteratorL>& __x, const move_iterator<_IteratorR>& __y) { return !(__x == __y); } template<typename _Iterator> inline _GLIBCXX17_CONSTEXPR bool operator!=(const move_iterator<_Iterator>& __x, const move_iterator<_Iterator>& __y) { return !(__x == __y); } template<typename _IteratorL, typename _IteratorR> inline _GLIBCXX17_CONSTEXPR bool operator<(const move_iterator<_IteratorL>& __x, const move_iterator<_IteratorR>& __y) { return __x.base() < __y.base(); } template<typename _Iterator> inline _GLIBCXX17_CONSTEXPR bool operator<(const move_iterator<_Iterator>& __x, const move_iterator<_Iterator>& __y) { return __x.base() < __y.base(); } template<typename _IteratorL, typename _IteratorR> inline _GLIBCXX17_CONSTEXPR bool operator<=(const move_iterator<_IteratorL>& __x, const move_iterator<_IteratorR>& __y) { return !(__y < __x); } template<typename _Iterator> inline _GLIBCXX17_CONSTEXPR bool operator<=(const move_iterator<_Iterator>& __x, const move_iterator<_Iterator>& __y) { return !(__y < __x); } template<typename _IteratorL, typename _IteratorR> inline _GLIBCXX17_CONSTEXPR bool operator>(const move_iterator<_IteratorL>& __x, const move_iterator<_IteratorR>& __y) { return __y < __x; } template<typename _Iterator> inline _GLIBCXX17_CONSTEXPR bool operator>(const move_iterator<_Iterator>& __x, const move_iterator<_Iterator>& __y) { return __y < __x; } template<typename _IteratorL, typename _IteratorR> inline _GLIBCXX17_CONSTEXPR bool operator>=(const move_iterator<_IteratorL>& __x, const move_iterator<_IteratorR>& __y) { return !(__x < __y); } template<typename _Iterator> inline _GLIBCXX17_CONSTEXPR bool operator>=(const move_iterator<_Iterator>& __x, const move_iterator<_Iterator>& __y) { return !(__x < __y); } // DR 685. template<typename _IteratorL, typename _IteratorR> inline _GLIBCXX17_CONSTEXPR auto operator-(const move_iterator<_IteratorL>& __x, const move_iterator<_IteratorR>& __y) -> decltype(__x.base() - __y.base()) { return __x.base() - __y.base(); } template<typename _Iterator> inline _GLIBCXX17_CONSTEXPR move_iterator<_Iterator> operator+(typename move_iterator<_Iterator>::difference_type __n, const move_iterator<_Iterator>& __x) { return __x + __n; } template<typename _Iterator> inline _GLIBCXX17_CONSTEXPR move_iterator<_Iterator> make_move_iterator(_Iterator __i) { return move_iterator<_Iterator>(__i); } template<typename _Iterator, typename _ReturnType = typename conditional<__move_if_noexcept_cond <typename iterator_traits<_Iterator>::value_type>::value, _Iterator, move_iterator<_Iterator>>::type> inline _GLIBCXX17_CONSTEXPR _ReturnType __make_move_if_noexcept_iterator(_Iterator __i) { return _ReturnType(__i); } // Overload for pointers that matches std::move_if_noexcept more closely, // returning a constant iterator when we don't want to move. template<typename _Tp, typename _ReturnType = typename conditional<__move_if_noexcept_cond<_Tp>::value, const _Tp*, move_iterator<_Tp*>>::type> inline _GLIBCXX17_CONSTEXPR _ReturnType __make_move_if_noexcept_iterator(_Tp* __i) { return _ReturnType(__i); } // @} group iterators template<typename _Iterator> auto __niter_base(move_iterator<_Iterator> __it) -> decltype(make_move_iterator(__niter_base(__it.base()))) { return make_move_iterator(__niter_base(__it.base())); } template<typename _Iterator> struct __is_move_iterator<move_iterator<_Iterator> > { enum { __value = 1 }; typedef __true_type __type; }; template<typename _Iterator> auto __miter_base(move_iterator<_Iterator> __it) -> decltype(__miter_base(__it.base())) { return __miter_base(__it.base()); } #define _GLIBCXX_MAKE_MOVE_ITERATOR(_Iter) std::make_move_iterator(_Iter) #define _GLIBCXX_MAKE_MOVE_IF_NOEXCEPT_ITERATOR(_Iter) \ std::__make_move_if_noexcept_iterator(_Iter) #else #define _GLIBCXX_MAKE_MOVE_ITERATOR(_Iter) (_Iter) #define _GLIBCXX_MAKE_MOVE_IF_NOEXCEPT_ITERATOR(_Iter) (_Iter) #endif // C++11 #if __cpp_deduction_guides >= 201606 // These helper traits are used for deduction guides // of associative containers. template<typename _InputIterator> using __iter_key_t = remove_const_t< typename iterator_traits<_InputIterator>::value_type::first_type>; template<typename _InputIterator> using __iter_val_t = typename iterator_traits<_InputIterator>::value_type::second_type; template<typename _T1, typename _T2> struct pair; template<typename _InputIterator> using __iter_to_alloc_t = pair<add_const_t<__iter_key_t<_InputIterator>>, __iter_val_t<_InputIterator>>; #endif _GLIBCXX_END_NAMESPACE_VERSION } // namespace #ifdef _GLIBCXX_DEBUG # include <debug/stl_iterator.h> #endif #endif
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