forked from OSchip/llvm-project
636 lines
26 KiB
C++
636 lines
26 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP_ITERATOR
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#define _LIBCPP_ITERATOR
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/*
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iterator synopsis
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#include <concepts>
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namespace std
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{
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template<class> struct incrementable_traits; // since C++20
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template<class T>
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using iter_difference_t = see below; // since C++20
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template<class> struct indirectly_readable_traits; // since C++20
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template<class T>
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using iter_value_t = see below; // since C++20
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template<class Iterator>
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struct iterator_traits;
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template<class T>
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requires is_object_v<T> // since C++20
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struct iterator_traits<T*>;
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template<dereferenceable T>
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using iter_reference_t = decltype(*declval<T&>());
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namespace ranges::inline unspecified {
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inline constexpr unspecified iter_move = unspecified; // since C++20, nodiscard as an extension
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}}
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template<dereferenceable T>
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requires ...
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using iter_rvalue_reference_t = decltype(ranges::iter_move(declval<T&>())); // since C++20
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// [iterator.concepts], iterator concepts
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// [iterator.concept.readable], concept indirectly_readable
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template<class In>
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concept indirectly_readable = see below; // since C++20
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template<indirectly_readable T>
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using iter_common_reference_t =
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common_reference_t<iter_reference_t<T>, iter_value_t<T>&>; // since C++20
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// [iterator.concept.writable], concept indirectly_writable
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template<class Out, class T>
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concept indirectly_writable = see below; // since C++20
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// [iterator.concept.winc], concept weakly_incrementable
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template<class I>
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concept weakly_incrementable = see below; // since C++20
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// [iterator.concept.inc], concept incrementable
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template<class I>
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concept incrementable = see below; // since C++20
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// [iterator.concept.iterator], concept input_or_output_iterator
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template<class I>
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concept input_or_output_iterator = see below; // since C++20
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// [iterator.concept.sentinel], concept sentinel_for
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template<class S, class I>
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concept sentinel_for = see below; // since C++20
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// [iterator.concept.sizedsentinel], concept sized_sentinel_for
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template<class S, class I>
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inline constexpr bool disable_sized_sentinel_for = false;
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template<class S, class I>
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concept sized_sentinel_for = see below;
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// [iterator.concept.input], concept input_iterator
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template<class I>
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concept input_iterator = see below; // since C++20
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// [iterator.concept.output], concept output_iterator
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template<class I, class T>
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concept output_iterator = see below; // since C++20
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// [iterator.concept.forward], concept forward_iterator
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template<class I>
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concept forward_iterator = see below; // since C++20
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// [iterator.concept.bidir], concept bidirectional_iterator
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template<class I>
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concept bidirectional_iterator = see below; // since C++20
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// [iterator.concept.random.access], concept random_access_iterator
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template<class I>
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concept random_access_iterator = see below; // since C++20
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// [indirectcallable]
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// [indirectcallable.indirectinvocable]
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template<class F, class I>
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concept indirectly_unary_invocable = see below; // since C++20
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template<class F, class I>
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concept indirectly_regular_unary_invocable = see below; // since C++20
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template<class F, class I>
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concept indirect_unary_predicate = see below; // since C++20
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template<class F, class I1, class I2>
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concept indirect_binary_predicate = see below; // since C++20
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template<class F, class I1, class I2 = I1>
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concept indirect_equivalence_relation = see below; // since C++20
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template<class F, class I1, class I2 = I1>
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concept indirect_strict_weak_order = see below; // since C++20
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template<class F, class... Is>
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using indirect_result_t = see below; // since C++20
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// [projected], projected
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template<indirectly_readable I, indirectly_regular_unary_invocable<I> Proj>
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struct projected; // since C++20
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template<weakly_incrementable I, indirectly_regular_unary_invocable<I> Proj>
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struct incrementable_traits<projected<I, Proj>>; // since C++20
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// [alg.req.ind.move], concept indirectly_movable
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template<class In, class Out>
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concept indirectly_movable = see below; // since C++20
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template<class In, class Out>
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concept indirectly_movable_storable = see below; // since C++20
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// [alg.req.ind.swap], concept indirectly_swappable
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template<class I1, class I2 = I1>
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concept indirectly_swappable = see below; // since C++20
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template<class I1, class I2, class R, class P1 = identity,
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class P2 = identity>
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concept indirectly_comparable =
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indirect_binary_predicate<R, projected<I1, P1>, projected<I2, P2>>; // since C++20
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template<input_or_output_iterator I, sentinel_for<I> S>
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requires (!same_as<I, S> && copyable<I>)
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class common_iterator; // since C++20
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template<class Category, class T, class Distance = ptrdiff_t,
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class Pointer = T*, class Reference = T&>
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struct iterator // deprecated in C++17
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{
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typedef T value_type;
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typedef Distance difference_type;
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typedef Pointer pointer;
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typedef Reference reference;
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typedef Category iterator_category;
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};
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struct input_iterator_tag {};
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struct output_iterator_tag {};
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struct forward_iterator_tag : public input_iterator_tag {};
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struct bidirectional_iterator_tag : public forward_iterator_tag {};
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struct random_access_iterator_tag : public bidirectional_iterator_tag {};
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// 27.4.3, iterator operations
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template <class InputIterator, class Distance> // constexpr in C++17
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constexpr void advance(InputIterator& i, Distance n);
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template <class InputIterator> // constexpr in C++17
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constexpr typename iterator_traits<InputIterator>::difference_type
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distance(InputIterator first, InputIterator last);
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template <class InputIterator> // constexpr in C++17
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constexpr InputIterator next(InputIterator x,
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typename iterator_traits<InputIterator>::difference_type n = 1);
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template <class BidirectionalIterator> // constexpr in C++17
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constexpr BidirectionalIterator prev(BidirectionalIterator x,
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typename iterator_traits<BidirectionalIterator>::difference_type n = 1);
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// [range.iter.ops], range iterator operations
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namespace ranges {
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// [range.iter.op.advance], ranges::advance
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template<input_or_output_iterator I>
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constexpr void advance(I& i, iter_difference_t<I> n); // since C++20
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template<input_or_output_iterator I, sentinel_for<I> S>
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constexpr void advance(I& i, S bound); // since C++20
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template<input_or_output_iterator I, sentinel_for<I> S>
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constexpr iter_difference_t<I> advance(I& i, iter_difference_t<I> n, S bound); // since C++20
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}
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template <class Iterator>
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class reverse_iterator
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: public iterator<typename iterator_traits<Iterator>::iterator_category, // until C++17
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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 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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constexpr reverse_iterator();
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constexpr explicit reverse_iterator(Iterator x);
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template <class U> constexpr reverse_iterator(const reverse_iterator<U>& u);
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template <class U> constexpr reverse_iterator& operator=(const reverse_iterator<U>& u);
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constexpr Iterator base() const;
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constexpr reference operator*() const;
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constexpr pointer operator->() const;
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constexpr reverse_iterator& operator++();
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constexpr reverse_iterator operator++(int);
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constexpr reverse_iterator& operator--();
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constexpr reverse_iterator operator--(int);
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constexpr reverse_iterator operator+ (difference_type n) const;
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constexpr reverse_iterator& operator+=(difference_type n);
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constexpr reverse_iterator operator- (difference_type n) const;
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constexpr reverse_iterator& operator-=(difference_type n);
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constexpr reference operator[](difference_type n) const;
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};
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template <class Iterator1, class Iterator2>
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constexpr bool // constexpr in C++17
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operator==(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
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template <class Iterator1, class Iterator2>
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constexpr bool // constexpr in C++17
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operator<(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
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template <class Iterator1, class Iterator2>
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constexpr bool // constexpr in C++17
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operator!=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
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template <class Iterator1, class Iterator2>
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constexpr bool // constexpr in C++17
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operator>(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
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template <class Iterator1, class Iterator2>
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constexpr bool // constexpr in C++17
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operator>=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
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template <class Iterator1, class Iterator2>
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constexpr bool // constexpr in C++17
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operator<=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
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template <class Iterator1, class Iterator2>
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constexpr auto
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operator-(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y)
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-> decltype(__y.base() - __x.base()); // constexpr in C++17
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template <class Iterator>
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constexpr reverse_iterator<Iterator>
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operator+(typename reverse_iterator<Iterator>::difference_type n,
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const reverse_iterator<Iterator>& x); // constexpr in C++17
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template <class Iterator>
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constexpr reverse_iterator<Iterator> make_reverse_iterator(Iterator i); // C++14, constexpr in C++17
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template <class Container>
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class back_insert_iterator
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: public iterator<output_iterator_tag, void, void, void, void> // until C++17
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{
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protected:
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Container* container;
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public:
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typedef Container container_type;
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typedef void value_type;
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typedef void difference_type; // until C++20
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typedef ptrdiff_t difference_type; // since C++20
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typedef void reference;
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typedef void pointer;
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explicit back_insert_iterator(Container& x); // constexpr in C++20
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back_insert_iterator& operator=(const typename Container::value_type& value); // constexpr in C++20
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back_insert_iterator& operator*(); // constexpr in C++20
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back_insert_iterator& operator++(); // constexpr in C++20
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back_insert_iterator operator++(int); // constexpr in C++20
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};
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template <class Container> back_insert_iterator<Container> back_inserter(Container& x); // constexpr in C++20
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template <class Container>
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class front_insert_iterator
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: public iterator<output_iterator_tag, void, void, void, void> // until C++17
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{
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protected:
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Container* container;
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public:
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typedef Container container_type;
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typedef void value_type;
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typedef void difference_type; // until C++20
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typedef ptrdiff_t difference_type; // since C++20
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typedef void reference;
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typedef void pointer;
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explicit front_insert_iterator(Container& x); // constexpr in C++20
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front_insert_iterator& operator=(const typename Container::value_type& value); // constexpr in C++20
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front_insert_iterator& operator*(); // constexpr in C++20
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front_insert_iterator& operator++(); // constexpr in C++20
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front_insert_iterator operator++(int); // constexpr in C++20
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};
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template <class Container> front_insert_iterator<Container> front_inserter(Container& x); // constexpr in C++20
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template <class Container>
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class insert_iterator
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: public iterator<output_iterator_tag, void, void, void, void> // until C++17
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{
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protected:
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Container* container;
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typename Container::iterator iter;
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public:
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typedef Container container_type;
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typedef void value_type;
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typedef void difference_type; // until C++20
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typedef ptrdiff_t difference_type; // since C++20
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typedef void reference;
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typedef void pointer;
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insert_iterator(Container& x, typename Container::iterator i); // constexpr in C++20
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insert_iterator& operator=(const typename Container::value_type& value); // constexpr in C++20
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insert_iterator& operator*(); // constexpr in C++20
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insert_iterator& operator++(); // constexpr in C++20
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insert_iterator& operator++(int); // constexpr in C++20
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};
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template <class Container, class Iterator>
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insert_iterator<Container> inserter(Container& x, Iterator i); // constexpr in C++20
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template <class Iterator>
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class move_iterator {
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public:
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typedef Iterator iterator_type;
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typedef typename iterator_traits<Iterator>::difference_type difference_type;
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typedef Iterator pointer;
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typedef typename iterator_traits<Iterator>::value_type value_type;
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typedef typename iterator_traits<Iterator>::iterator_category iterator_category;
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typedef value_type&& reference;
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constexpr move_iterator(); // all the constexprs are in C++17
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constexpr explicit move_iterator(Iterator i);
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template <class U>
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constexpr move_iterator(const move_iterator<U>& u);
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template <class U>
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constexpr move_iterator& operator=(const move_iterator<U>& u);
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constexpr iterator_type base() const;
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constexpr reference operator*() const;
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constexpr pointer operator->() const;
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constexpr move_iterator& operator++();
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constexpr move_iterator operator++(int);
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constexpr move_iterator& operator--();
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constexpr move_iterator operator--(int);
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constexpr move_iterator operator+(difference_type n) const;
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constexpr move_iterator& operator+=(difference_type n);
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constexpr move_iterator operator-(difference_type n) const;
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constexpr move_iterator& operator-=(difference_type n);
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constexpr unspecified operator[](difference_type n) const;
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private:
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Iterator current; // exposition only
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};
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template <class Iterator1, class Iterator2>
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constexpr bool // constexpr in C++17
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operator==(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
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template <class Iterator1, class Iterator2>
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constexpr bool // constexpr in C++17
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operator!=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
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template <class Iterator1, class Iterator2>
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constexpr bool // constexpr in C++17
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operator<(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
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template <class Iterator1, class Iterator2>
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constexpr bool // constexpr in C++17
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operator<=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
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template <class Iterator1, class Iterator2>
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constexpr bool // constexpr in C++17
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operator>(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
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template <class Iterator1, class Iterator2>
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constexpr bool // constexpr in C++17
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operator>=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
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template <class Iterator1, class Iterator2>
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constexpr auto // constexpr in C++17
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operator-(const move_iterator<Iterator1>& x,
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const move_iterator<Iterator2>& y) -> decltype(x.base() - y.base());
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template <class Iterator>
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constexpr move_iterator<Iterator> operator+( // constexpr in C++17
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typename move_iterator<Iterator>::difference_type n,
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const move_iterator<Iterator>& x);
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template <class Iterator> // constexpr in C++17
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constexpr move_iterator<Iterator> make_move_iterator(const Iterator& i);
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// [default.sentinel], default sentinel
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struct default_sentinel_t;
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inline constexpr default_sentinel_t default_sentinel{};
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// [iterators.counted], counted iterators
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template<input_or_output_iterator I> class counted_iterator;
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template<input_iterator I>
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requires see below
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struct iterator_traits<counted_iterator<I>>;
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// [unreachable.sentinel], unreachable sentinel
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struct unreachable_sentinel_t;
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inline constexpr unreachable_sentinel_t unreachable_sentinel{};
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template <class T, class charT = char, class traits = char_traits<charT>, class Distance = ptrdiff_t>
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class istream_iterator
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: public iterator<input_iterator_tag, T, Distance, const T*, const T&> // until C++17
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{
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public:
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typedef input_iterator_tag iterator_category;
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typedef T value_type;
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typedef Distance difference_type;
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typedef const T* pointer;
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typedef const T& reference;
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typedef charT char_type;
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typedef traits traits_type;
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typedef basic_istream<charT, traits> istream_type;
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constexpr istream_iterator();
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istream_iterator(istream_type& s);
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istream_iterator(const istream_iterator& x);
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~istream_iterator();
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const T& operator*() const;
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const T* operator->() const;
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istream_iterator& operator++();
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istream_iterator operator++(int);
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};
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template <class T, class charT, class traits, class Distance>
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bool operator==(const istream_iterator<T,charT,traits,Distance>& x,
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const istream_iterator<T,charT,traits,Distance>& y);
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template <class T, class charT, class traits, class Distance>
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bool operator!=(const istream_iterator<T,charT,traits,Distance>& x,
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const istream_iterator<T,charT,traits,Distance>& y);
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template <class T, class charT = char, class traits = char_traits<charT> >
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class ostream_iterator
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: public iterator<output_iterator_tag, void, void, void, void> // until C++17
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{
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public:
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typedef output_iterator_tag iterator_category;
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typedef void value_type;
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typedef void difference_type; // until C++20
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typedef ptrdiff_t difference_type; // since C++20
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typedef void pointer;
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typedef void reference;
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typedef charT char_type;
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typedef traits traits_type;
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typedef basic_ostream<charT,traits> ostream_type;
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ostream_iterator(ostream_type& s);
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ostream_iterator(ostream_type& s, const charT* delimiter);
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ostream_iterator(const ostream_iterator& x);
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~ostream_iterator();
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ostream_iterator& operator=(const T& value);
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ostream_iterator& operator*();
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ostream_iterator& operator++();
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ostream_iterator& operator++(int);
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};
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template<class charT, class traits = char_traits<charT> >
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class istreambuf_iterator
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: public iterator<input_iterator_tag, charT, traits::off_type, unspecified, charT> // until C++17
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{
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public:
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typedef input_iterator_tag iterator_category;
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|
typedef charT value_type;
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|
typedef traits::off_type difference_type;
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|
typedef unspecified pointer;
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|
typedef charT reference;
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|
|
|
typedef charT char_type;
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|
typedef traits traits_type;
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|
typedef traits::int_type int_type;
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|
typedef basic_streambuf<charT, traits> streambuf_type;
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|
typedef basic_istream<charT, traits> istream_type;
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|
|
|
istreambuf_iterator() noexcept;
|
|
istreambuf_iterator(istream_type& s) noexcept;
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|
istreambuf_iterator(streambuf_type* s) noexcept;
|
|
istreambuf_iterator(a-private-type) noexcept;
|
|
|
|
charT operator*() const;
|
|
pointer operator->() const;
|
|
istreambuf_iterator& operator++();
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|
a-private-type operator++(int);
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|
|
|
bool equal(const istreambuf_iterator& b) const;
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|
};
|
|
|
|
template <class charT, class traits>
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|
bool operator==(const istreambuf_iterator<charT,traits>& a,
|
|
const istreambuf_iterator<charT,traits>& b);
|
|
template <class charT, class traits>
|
|
bool operator!=(const istreambuf_iterator<charT,traits>& a,
|
|
const istreambuf_iterator<charT,traits>& b);
|
|
|
|
template <class charT, class traits = char_traits<charT> >
|
|
class ostreambuf_iterator
|
|
: public iterator<output_iterator_tag, void, void, void, void> // until C++17
|
|
{
|
|
public:
|
|
typedef output_iterator_tag iterator_category;
|
|
typedef void value_type;
|
|
typedef void difference_type; // until C++20
|
|
typedef ptrdiff_t difference_type; // since C++20
|
|
typedef void pointer;
|
|
typedef void reference;
|
|
|
|
typedef charT char_type;
|
|
typedef traits traits_type;
|
|
typedef basic_streambuf<charT, traits> streambuf_type;
|
|
typedef basic_ostream<charT, traits> ostream_type;
|
|
|
|
ostreambuf_iterator(ostream_type& s) noexcept;
|
|
ostreambuf_iterator(streambuf_type* s) noexcept;
|
|
ostreambuf_iterator& operator=(charT c);
|
|
ostreambuf_iterator& operator*();
|
|
ostreambuf_iterator& operator++();
|
|
ostreambuf_iterator& operator++(int);
|
|
bool failed() const noexcept;
|
|
};
|
|
|
|
template <class C> constexpr auto begin(C& c) -> decltype(c.begin());
|
|
template <class C> constexpr auto begin(const C& c) -> decltype(c.begin());
|
|
template <class C> constexpr auto end(C& c) -> decltype(c.end());
|
|
template <class C> constexpr auto end(const C& c) -> decltype(c.end());
|
|
template <class T, size_t N> constexpr T* begin(T (&array)[N]);
|
|
template <class T, size_t N> constexpr T* end(T (&array)[N]);
|
|
|
|
template <class C> auto constexpr cbegin(const C& c) -> decltype(std::begin(c)); // C++14
|
|
template <class C> auto constexpr cend(const C& c) -> decltype(std::end(c)); // C++14
|
|
template <class C> auto constexpr rbegin(C& c) -> decltype(c.rbegin()); // C++14
|
|
template <class C> auto constexpr rbegin(const C& c) -> decltype(c.rbegin()); // C++14
|
|
template <class C> auto constexpr rend(C& c) -> decltype(c.rend()); // C++14
|
|
template <class C> constexpr auto rend(const C& c) -> decltype(c.rend()); // C++14
|
|
template <class E> reverse_iterator<const E*> constexpr rbegin(initializer_list<E> il); // C++14
|
|
template <class E> reverse_iterator<const E*> constexpr rend(initializer_list<E> il); // C++14
|
|
template <class T, size_t N> reverse_iterator<T*> constexpr rbegin(T (&array)[N]); // C++14
|
|
template <class T, size_t N> reverse_iterator<T*> constexpr rend(T (&array)[N]); // C++14
|
|
template <class C> constexpr auto crbegin(const C& c) -> decltype(std::rbegin(c)); // C++14
|
|
template <class C> constexpr auto crend(const C& c) -> decltype(std::rend(c)); // C++14
|
|
|
|
// 24.8, container access:
|
|
template <class C> constexpr auto size(const C& c) -> decltype(c.size()); // C++17
|
|
template <class T, size_t N> constexpr size_t size(const T (&array)[N]) noexcept; // C++17
|
|
|
|
template <class C> constexpr auto ssize(const C& c)
|
|
-> common_type_t<ptrdiff_t, make_signed_t<decltype(c.size())>>; // C++20
|
|
template <class T, ptrdiff_t> constexpr ptrdiff_t ssize(const T (&array)[N]) noexcept; // C++20
|
|
|
|
template <class C> constexpr auto empty(const C& c) -> decltype(c.empty()); // C++17
|
|
template <class T, size_t N> constexpr bool empty(const T (&array)[N]) noexcept; // C++17
|
|
template <class E> constexpr bool empty(initializer_list<E> il) noexcept; // C++17
|
|
template <class C> constexpr auto data(C& c) -> decltype(c.data()); // C++17
|
|
template <class C> constexpr auto data(const C& c) -> decltype(c.data()); // C++17
|
|
template <class T, size_t N> constexpr T* data(T (&array)[N]) noexcept; // C++17
|
|
template <class E> constexpr const E* data(initializer_list<E> il) noexcept; // C++17
|
|
|
|
} // std
|
|
|
|
*/
|
|
|
|
#include <__config>
|
|
#include <__debug>
|
|
#include <__functional_base>
|
|
#include <__iterator/access.h>
|
|
#include <__iterator/advance.h>
|
|
#include <__iterator/back_insert_iterator.h>
|
|
#include <__iterator/common_iterator.h>
|
|
#include <__iterator/concepts.h>
|
|
#include <__iterator/counted_iterator.h>
|
|
#include <__iterator/data.h>
|
|
#include <__iterator/default_sentinel.h>
|
|
#include <__iterator/distance.h>
|
|
#include <__iterator/empty.h>
|
|
#include <__iterator/erase_if_container.h>
|
|
#include <__iterator/front_insert_iterator.h>
|
|
#include <__iterator/incrementable_traits.h>
|
|
#include <__iterator/indirectly_comparable.h>
|
|
#include <__iterator/insert_iterator.h>
|
|
#include <__iterator/istream_iterator.h>
|
|
#include <__iterator/istreambuf_iterator.h>
|
|
#include <__iterator/iter_move.h>
|
|
#include <__iterator/iter_swap.h>
|
|
#include <__iterator/iterator.h>
|
|
#include <__iterator/iterator_traits.h>
|
|
#include <__iterator/move_iterator.h>
|
|
#include <__iterator/next.h>
|
|
#include <__iterator/ostream_iterator.h>
|
|
#include <__iterator/ostreambuf_iterator.h>
|
|
#include <__iterator/prev.h>
|
|
#include <__iterator/projected.h>
|
|
#include <__iterator/readable_traits.h>
|
|
#include <__iterator/reverse_access.h>
|
|
#include <__iterator/reverse_iterator.h>
|
|
#include <__iterator/size.h>
|
|
#include <__iterator/unreachable_sentinel.h>
|
|
#include <__iterator/wrap_iter.h>
|
|
#include <__memory/addressof.h>
|
|
#include <__memory/pointer_traits.h>
|
|
#include <__utility/forward.h>
|
|
#include <compare>
|
|
#include <concepts> // Mandated by the Standard.
|
|
#include <cstddef>
|
|
#include <initializer_list>
|
|
#include <type_traits>
|
|
#include <version>
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
#pragma GCC system_header
|
|
#endif
|
|
|
|
#endif // _LIBCPP_ITERATOR
|