Filename: //usr/include/c++/10///bits///stl_iterator_base_types.h

// Types used in iterator implementation -*- C++ -*- // Copyright (C) 2001-2020 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_base_types.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{iterator} * * This file contains all of the general iterator-related utility types, * such as iterator_traits and struct iterator. */ #ifndef _STL_ITERATOR_BASE_TYPES_H #define _STL_ITERATOR_BASE_TYPES_H 1 #pragma GCC system_header #include <bits/c++config.h> #if __cplusplus >= 201103L # include <type_traits> // For __void_t, is_convertible #endif #if __cplusplus > 201703L && __cpp_concepts >= 201907L # include <bits/iterator_concepts.h> #endif namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /** * @defgroup iterators Iterators * Abstractions for uniform iterating through various underlying types. */ //@{ /** * @defgroup iterator_tags Iterator Tags * These are empty types, used to distinguish different iterators. The * distinction is not made by what they contain, but simply by what they * are. Different underlying algorithms can then be used based on the * different operations supported by different iterator types. */ //@{ /// Marking input iterators. struct input_iterator_tag { }; /// Marking output iterators. struct output_iterator_tag { }; /// Forward iterators support a superset of input iterator operations. struct forward_iterator_tag : public input_iterator_tag { }; /// Bidirectional iterators support a superset of forward iterator /// operations. struct bidirectional_iterator_tag : public forward_iterator_tag { }; /// Random-access iterators support a superset of bidirectional /// iterator operations. struct random_access_iterator_tag : public bidirectional_iterator_tag { }; #if __cplusplus > 201703L /// Contiguous iterators point to objects stored contiguously in memory. struct contiguous_iterator_tag : public random_access_iterator_tag { }; #endif //@} /** * @brief Common %iterator class. * * This class does nothing but define nested typedefs. %Iterator classes * can inherit from this class to save some work. The typedefs are then * used in specializations and overloading. * * In particular, there are no default implementations of requirements * such as @c operator++ and the like. (How could there be?) */ template<typename _Category, typename _Tp, typename _Distance = ptrdiff_t, typename _Pointer = _Tp*, typename _Reference = _Tp&> struct iterator { /// One of the @link iterator_tags tag types@endlink. typedef _Category iterator_category; /// The type "pointed to" by the iterator. typedef _Tp value_type; /// Distance between iterators is represented as this type. typedef _Distance difference_type; /// This type represents a pointer-to-value_type. typedef _Pointer pointer; /// This type represents a reference-to-value_type. typedef _Reference reference; }; /** * @brief Traits class for iterators. * * This class does nothing but define nested typedefs. The general * version simply @a forwards the nested typedefs from the Iterator * argument. Specialized versions for pointers and pointers-to-const * provide tighter, more correct semantics. */ template<typename _Iterator> struct iterator_traits; #if __cplusplus >= 201103L // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2408. SFINAE-friendly common_type/iterator_traits is missing in C++14 template<typename _Iterator, typename = __void_t<>> struct __iterator_traits { }; #if ! __cpp_lib_concepts template<typename _Iterator> struct __iterator_traits<_Iterator, __void_t<typename _Iterator::iterator_category, typename _Iterator::value_type, typename _Iterator::difference_type, typename _Iterator::pointer, typename _Iterator::reference>> { typedef typename _Iterator::iterator_category iterator_category; typedef typename _Iterator::value_type value_type; typedef typename _Iterator::difference_type difference_type; typedef typename _Iterator::pointer pointer; typedef typename _Iterator::reference reference; }; #endif // ! concepts template<typename _Iterator> struct iterator_traits : public __iterator_traits<_Iterator> { }; #else // ! C++11 template<typename _Iterator> struct iterator_traits { typedef typename _Iterator::iterator_category iterator_category; typedef typename _Iterator::value_type value_type; typedef typename _Iterator::difference_type difference_type; typedef typename _Iterator::pointer pointer; typedef typename _Iterator::reference reference; }; #endif // C++11 #if __cplusplus > 201703L /// Partial specialization for object pointer types. template<typename _Tp> #if __cpp_concepts >= 201907L requires is_object_v<_Tp> #endif struct iterator_traits<_Tp*> { using iterator_concept = contiguous_iterator_tag; using iterator_category = random_access_iterator_tag; using value_type = remove_cv_t<_Tp>; using difference_type = ptrdiff_t; using pointer = _Tp*; using reference = _Tp&; }; #else /// Partial specialization for pointer types. template<typename _Tp> struct iterator_traits<_Tp*> { typedef random_access_iterator_tag iterator_category; typedef _Tp value_type; typedef ptrdiff_t difference_type; typedef _Tp* pointer; typedef _Tp& reference; }; /// Partial specialization for const pointer types. template<typename _Tp> struct iterator_traits<const _Tp*> { typedef random_access_iterator_tag iterator_category; typedef _Tp value_type; typedef ptrdiff_t difference_type; typedef const _Tp* pointer; typedef const _Tp& reference; }; #endif /** * This function is not a part of the C++ standard but is syntactic * sugar for internal library use only. */ template<typename _Iter> inline _GLIBCXX_CONSTEXPR typename iterator_traits<_Iter>::iterator_category __iterator_category(const _Iter&) { return typename iterator_traits<_Iter>::iterator_category(); } //@} #if __cplusplus >= 201103L template<typename _Iter> using __iterator_category_t = typename iterator_traits<_Iter>::iterator_category; template<typename _InIter> using _RequireInputIter = __enable_if_t<is_convertible<__iterator_category_t<_InIter>, input_iterator_tag>::value>; template<typename _It, typename _Cat = __iterator_category_t<_It>> struct __is_random_access_iter : is_base_of<random_access_iterator_tag, _Cat> { typedef is_base_of<random_access_iterator_tag, _Cat> _Base; enum { __value = _Base::value }; }; #else template<typename _It, typename _Traits = iterator_traits<_It>, typename _Cat = typename _Traits::iterator_category> struct __is_random_access_iter { enum { __value = __is_base_of(random_access_iterator_tag, _Cat) }; }; #endif _GLIBCXX_END_NAMESPACE_VERSION } // namespace #endif /* _STL_ITERATOR_BASE_TYPES_H */

./Ninja\.