LCOV - code coverage report
Current view: top level - usr/include/c++/9/bits - stl_set.h (source / functions) Hit Total Coverage
Test: ROSE Lines: 41 53 77.4 %
Date: 2022-12-08 13:48:47 Functions: 17 23 73.9 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : // Set implementation -*- C++ -*-
       2             : 
       3             : // Copyright (C) 2001-2019 Free Software Foundation, Inc.
       4             : //
       5             : // This file is part of the GNU ISO C++ Library.  This library is free
       6             : // software; you can redistribute it and/or modify it under the
       7             : // terms of the GNU General Public License as published by the
       8             : // Free Software Foundation; either version 3, or (at your option)
       9             : // any later version.
      10             : 
      11             : // This library is distributed in the hope that it will be useful,
      12             : // but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14             : // GNU General Public License for more details.
      15             : 
      16             : // Under Section 7 of GPL version 3, you are granted additional
      17             : // permissions described in the GCC Runtime Library Exception, version
      18             : // 3.1, as published by the Free Software Foundation.
      19             : 
      20             : // You should have received a copy of the GNU General Public License and
      21             : // a copy of the GCC Runtime Library Exception along with this program;
      22             : // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
      23             : // <http://www.gnu.org/licenses/>.
      24             : 
      25             : /*
      26             :  *
      27             :  * Copyright (c) 1994
      28             :  * Hewlett-Packard Company
      29             :  *
      30             :  * Permission to use, copy, modify, distribute and sell this software
      31             :  * and its documentation for any purpose is hereby granted without fee,
      32             :  * provided that the above copyright notice appear in all copies and
      33             :  * that both that copyright notice and this permission notice appear
      34             :  * in supporting documentation.  Hewlett-Packard Company makes no
      35             :  * representations about the suitability of this software for any
      36             :  * purpose.  It is provided "as is" without express or implied warranty.
      37             :  *
      38             :  *
      39             :  * Copyright (c) 1996,1997
      40             :  * Silicon Graphics Computer Systems, Inc.
      41             :  *
      42             :  * Permission to use, copy, modify, distribute and sell this software
      43             :  * and its documentation for any purpose is hereby granted without fee,
      44             :  * provided that the above copyright notice appear in all copies and
      45             :  * that both that copyright notice and this permission notice appear
      46             :  * in supporting documentation.  Silicon Graphics makes no
      47             :  * representations about the suitability of this software for any
      48             :  * purpose.  It is provided "as is" without express or implied warranty.
      49             :  */
      50             : 
      51             : /** @file bits/stl_set.h
      52             :  *  This is an internal header file, included by other library headers.
      53             :  *  Do not attempt to use it directly. @headername{set}
      54             :  */
      55             : 
      56             : #ifndef _STL_SET_H
      57             : #define _STL_SET_H 1
      58             : 
      59             : #include <bits/concept_check.h>
      60             : #if __cplusplus >= 201103L
      61             : #include <initializer_list>
      62             : #endif
      63             : 
      64             : namespace std _GLIBCXX_VISIBILITY(default)
      65             : {
      66             : _GLIBCXX_BEGIN_NAMESPACE_VERSION
      67             : _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
      68             : 
      69             :   template<typename _Key, typename _Compare, typename _Alloc>
      70             :     class multiset;
      71             : 
      72             :   /**
      73             :    *  @brief A standard container made up of unique keys, which can be
      74             :    *  retrieved in logarithmic time.
      75             :    *
      76             :    *  @ingroup associative_containers
      77             :    *
      78             :    *  @tparam _Key  Type of key objects.
      79             :    *  @tparam _Compare  Comparison function object type, defaults to less<_Key>.
      80             :    *  @tparam _Alloc  Allocator type, defaults to allocator<_Key>.
      81             :    *
      82             :    *  Meets the requirements of a <a href="tables.html#65">container</a>, a
      83             :    *  <a href="tables.html#66">reversible container</a>, and an
      84             :    *  <a href="tables.html#69">associative container</a> (using unique keys).
      85             :    *
      86             :    *  Sets support bidirectional iterators.
      87             :    *
      88             :    *  The private tree data is declared exactly the same way for set and
      89             :    *  multiset; the distinction is made entirely in how the tree functions are
      90             :    *  called (*_unique versus *_equal, same as the standard).
      91             :   */
      92             :   template<typename _Key, typename _Compare = std::less<_Key>,
      93             :            typename _Alloc = std::allocator<_Key> >
      94    10294351 :     class set
      95             :     {
      96             : #ifdef _GLIBCXX_CONCEPT_CHECKS
      97             :       // concept requirements
      98             :       typedef typename _Alloc::value_type               _Alloc_value_type;
      99             : # if __cplusplus < 201103L
     100             :       __glibcxx_class_requires(_Key, _SGIAssignableConcept)
     101             : # endif
     102             :       __glibcxx_class_requires4(_Compare, bool, _Key, _Key,
     103             :                                 _BinaryFunctionConcept)
     104             :       __glibcxx_class_requires2(_Key, _Alloc_value_type, _SameTypeConcept)
     105             : #endif
     106             : 
     107             : #if __cplusplus >= 201103L
     108             :       static_assert(is_same<typename remove_cv<_Key>::type, _Key>::value,
     109             :           "std::set must have a non-const, non-volatile value_type");
     110             : # ifdef __STRICT_ANSI__
     111             :       static_assert(is_same<typename _Alloc::value_type, _Key>::value,
     112             :           "std::set must have the same value_type as its allocator");
     113             : # endif
     114             : #endif
     115             : 
     116             :     public:
     117             :       // typedefs:
     118             :       ///@{
     119             :       /// Public typedefs.
     120             :       typedef _Key     key_type;
     121             :       typedef _Key     value_type;
     122             :       typedef _Compare key_compare;
     123             :       typedef _Compare value_compare;
     124             :       typedef _Alloc   allocator_type;
     125             :       ///@}
     126             : 
     127             :     private:
     128             :       typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template
     129             :         rebind<_Key>::other _Key_alloc_type;
     130             : 
     131             :       typedef _Rb_tree<key_type, value_type, _Identity<value_type>,
     132             :                        key_compare, _Key_alloc_type> _Rep_type;
     133             :       _Rep_type _M_t;  // Red-black tree representing set.
     134             : 
     135             :       typedef __gnu_cxx::__alloc_traits<_Key_alloc_type> _Alloc_traits;
     136             : 
     137             :     public:
     138             :       ///@{
     139             :       ///  Iterator-related typedefs.
     140             :       typedef typename _Alloc_traits::pointer            pointer;
     141             :       typedef typename _Alloc_traits::const_pointer      const_pointer;
     142             :       typedef typename _Alloc_traits::reference          reference;
     143             :       typedef typename _Alloc_traits::const_reference    const_reference;
     144             :       // _GLIBCXX_RESOLVE_LIB_DEFECTS
     145             :       // DR 103. set::iterator is required to be modifiable,
     146             :       // but this allows modification of keys.
     147             :       typedef typename _Rep_type::const_iterator         iterator;
     148             :       typedef typename _Rep_type::const_iterator         const_iterator;
     149             :       typedef typename _Rep_type::const_reverse_iterator reverse_iterator;
     150             :       typedef typename _Rep_type::const_reverse_iterator const_reverse_iterator;
     151             :       typedef typename _Rep_type::size_type              size_type;
     152             :       typedef typename _Rep_type::difference_type        difference_type;
     153             :       ///@}
     154             : 
     155             : #if __cplusplus > 201402L
     156             :       using node_type = typename _Rep_type::node_type;
     157             :       using insert_return_type = typename _Rep_type::insert_return_type;
     158             : #endif
     159             : 
     160             :       // allocation/deallocation
     161             :       /**
     162             :        *  @brief  Default constructor creates no elements.
     163             :        */
     164             : #if __cplusplus < 201103L
     165             :       set() : _M_t() { }
     166             : #else
     167    12414861 :       set() = default;
     168             : #endif
     169             : 
     170             :       /**
     171             :        *  @brief  Creates a %set with no elements.
     172             :        *  @param  __comp  Comparator to use.
     173             :        *  @param  __a  An allocator object.
     174             :        */
     175             :       explicit
     176           0 :       set(const _Compare& __comp,
     177             :           const allocator_type& __a = allocator_type())
     178           0 :       : _M_t(__comp, _Key_alloc_type(__a)) { }
     179             : 
     180             :       /**
     181             :        *  @brief  Builds a %set from a range.
     182             :        *  @param  __first  An input iterator.
     183             :        *  @param  __last  An input iterator.
     184             :        *
     185             :        *  Create a %set consisting of copies of the elements from
     186             :        *  [__first,__last).  This is linear in N if the range is
     187             :        *  already sorted, and NlogN otherwise (where N is
     188             :        *  distance(__first,__last)).
     189             :        */
     190             :       template<typename _InputIterator>
     191         896 :         set(_InputIterator __first, _InputIterator __last)
     192         896 :         : _M_t()
     193        1792 :         { _M_t._M_insert_range_unique(__first, __last); }
     194             : 
     195             :       /**
     196             :        *  @brief  Builds a %set from a range.
     197             :        *  @param  __first  An input iterator.
     198             :        *  @param  __last  An input iterator.
     199             :        *  @param  __comp  A comparison functor.
     200             :        *  @param  __a  An allocator object.
     201             :        *
     202             :        *  Create a %set consisting of copies of the elements from
     203             :        *  [__first,__last).  This is linear in N if the range is
     204             :        *  already sorted, and NlogN otherwise (where N is
     205             :        *  distance(__first,__last)).
     206             :        */
     207             :       template<typename _InputIterator>
     208             :         set(_InputIterator __first, _InputIterator __last,
     209             :             const _Compare& __comp,
     210             :             const allocator_type& __a = allocator_type())
     211             :         : _M_t(__comp, _Key_alloc_type(__a))
     212             :         { _M_t._M_insert_range_unique(__first, __last); }
     213             : 
     214             :       /**
     215             :        *  @brief  %Set copy constructor.
     216             :        *
     217             :        *  Whether the allocator is copied depends on the allocator traits.
     218             :        */
     219             : #if __cplusplus < 201103L
     220             :       set(const set& __x)
     221             :       : _M_t(__x._M_t) { }
     222             : #else
     223       36923 :       set(const set&) = default;
     224             : 
     225             :      /**
     226             :        *  @brief %Set move constructor
     227             :        *
     228             :        *  The newly-created %set contains the exact contents of the moved
     229             :        *  instance. The moved instance is a valid, but unspecified, %set.
     230             :        */
     231       28465 :       set(set&&) = default;
     232             : 
     233             :       /**
     234             :        *  @brief  Builds a %set from an initializer_list.
     235             :        *  @param  __l  An initializer_list.
     236             :        *  @param  __comp  A comparison functor.
     237             :        *  @param  __a  An allocator object.
     238             :        *
     239             :        *  Create a %set consisting of copies of the elements in the list.
     240             :        *  This is linear in N if the list is already sorted, and NlogN
     241             :        *  otherwise (where N is @a __l.size()).
     242             :        */
     243             :       set(initializer_list<value_type> __l,
     244             :           const _Compare& __comp = _Compare(),
     245             :           const allocator_type& __a = allocator_type())
     246             :       : _M_t(__comp, _Key_alloc_type(__a))
     247             :       { _M_t._M_insert_range_unique(__l.begin(), __l.end()); }
     248             : 
     249             :       /// Allocator-extended default constructor.
     250             :       explicit
     251             :       set(const allocator_type& __a)
     252             :       : _M_t(_Key_alloc_type(__a)) { }
     253             : 
     254             :       /// Allocator-extended copy constructor.
     255             :       set(const set& __x, const allocator_type& __a)
     256             :       : _M_t(__x._M_t, _Key_alloc_type(__a)) { }
     257             : 
     258             :       /// Allocator-extended move constructor.
     259             :       set(set&& __x, const allocator_type& __a)
     260             :       noexcept(is_nothrow_copy_constructible<_Compare>::value
     261             :                && _Alloc_traits::_S_always_equal())
     262             :       : _M_t(std::move(__x._M_t), _Key_alloc_type(__a)) { }
     263             : 
     264             :       /// Allocator-extended initialier-list constructor.
     265             :       set(initializer_list<value_type> __l, const allocator_type& __a)
     266             :       : _M_t(_Key_alloc_type(__a))
     267             :       { _M_t._M_insert_range_unique(__l.begin(), __l.end()); }
     268             : 
     269             :       /// Allocator-extended range constructor.
     270             :       template<typename _InputIterator>
     271             :         set(_InputIterator __first, _InputIterator __last,
     272             :             const allocator_type& __a)
     273             :         : _M_t(_Key_alloc_type(__a))
     274             :         { _M_t._M_insert_range_unique(__first, __last); }
     275             : 
     276             :       /**
     277             :        *  The dtor only erases the elements, and note that if the elements
     278             :        *  themselves are pointers, the pointed-to memory is not touched in any
     279             :        *  way. Managing the pointer is the user's responsibility.
     280             :        */
     281    20650374 :       ~set() = default;
     282             : #endif
     283             : 
     284             :       /**
     285             :        *  @brief  %Set assignment operator.
     286             :        *
     287             :        *  Whether the allocator is copied depends on the allocator traits.
     288             :        */
     289             : #if __cplusplus < 201103L
     290             :       set&
     291             :       operator=(const set& __x)
     292             :       {
     293             :         _M_t = __x._M_t;
     294             :         return *this;
     295             :       }
     296             : #else
     297             :       set&
     298             :       operator=(const set&) = default;
     299             : 
     300             :       /// Move assignment operator.
     301             :       set&
     302             :       operator=(set&&) = default;
     303             : 
     304             :       /**
     305             :        *  @brief  %Set list assignment operator.
     306             :        *  @param  __l  An initializer_list.
     307             :        *
     308             :        *  This function fills a %set with copies of the elements in the
     309             :        *  initializer list @a __l.
     310             :        *
     311             :        *  Note that the assignment completely changes the %set and
     312             :        *  that the resulting %set's size is the same as the number
     313             :        *  of elements assigned.
     314             :        */
     315             :       set&
     316             :       operator=(initializer_list<value_type> __l)
     317             :       {
     318             :         _M_t._M_assign_unique(__l.begin(), __l.end());
     319             :         return *this;
     320             :       }
     321             : #endif
     322             : 
     323             :       // accessors:
     324             : 
     325             :       ///  Returns the comparison object with which the %set was constructed.
     326             :       key_compare
     327             :       key_comp() const
     328             :       { return _M_t.key_comp(); }
     329             :       ///  Returns the comparison object with which the %set was constructed.
     330             :       value_compare
     331             :       value_comp() const
     332             :       { return _M_t.key_comp(); }
     333             :       ///  Returns the allocator object with which the %set was constructed.
     334             :       allocator_type
     335             :       get_allocator() const _GLIBCXX_NOEXCEPT
     336             :       { return allocator_type(_M_t.get_allocator()); }
     337             : 
     338             :       /**
     339             :        *  Returns a read-only (constant) iterator that points to the first
     340             :        *  element in the %set.  Iteration is done in ascending order according
     341             :        *  to the keys.
     342             :        */
     343             :       iterator
     344     1406978 :       begin() const _GLIBCXX_NOEXCEPT
     345     1274866 :       { return _M_t.begin(); }
     346             : 
     347             :       /**
     348             :        *  Returns a read-only (constant) iterator that points one past the last
     349             :        *  element in the %set.  Iteration is done in ascending order according
     350             :        *  to the keys.
     351             :        */
     352             :       iterator
     353    50364025 :       end() const _GLIBCXX_NOEXCEPT
     354    50233472 :       { return _M_t.end(); }
     355             : 
     356             :       /**
     357             :        *  Returns a read-only (constant) iterator that points to the last
     358             :        *  element in the %set.  Iteration is done in descending order according
     359             :        *  to the keys.
     360             :        */
     361             :       reverse_iterator
     362           0 :       rbegin() const _GLIBCXX_NOEXCEPT
     363           0 :       { return _M_t.rbegin(); }
     364             : 
     365             :       /**
     366             :        *  Returns a read-only (constant) reverse iterator that points to the
     367             :        *  last pair in the %set.  Iteration is done in descending order
     368             :        *  according to the keys.
     369             :        */
     370             :       reverse_iterator
     371           0 :       rend() const _GLIBCXX_NOEXCEPT
     372           0 :       { return _M_t.rend(); }
     373             : 
     374             : #if __cplusplus >= 201103L
     375             :       /**
     376             :        *  Returns a read-only (constant) iterator that points to the first
     377             :        *  element in the %set.  Iteration is done in ascending order according
     378             :        *  to the keys.
     379             :        */
     380             :       iterator
     381             :       cbegin() const noexcept
     382             :       { return _M_t.begin(); }
     383             : 
     384             :       /**
     385             :        *  Returns a read-only (constant) iterator that points one past the last
     386             :        *  element in the %set.  Iteration is done in ascending order according
     387             :        *  to the keys.
     388             :        */
     389             :       iterator
     390             :       cend() const noexcept
     391             :       { return _M_t.end(); }
     392             : 
     393             :       /**
     394             :        *  Returns a read-only (constant) iterator that points to the last
     395             :        *  element in the %set.  Iteration is done in descending order according
     396             :        *  to the keys.
     397             :        */
     398             :       reverse_iterator
     399             :       crbegin() const noexcept
     400             :       { return _M_t.rbegin(); }
     401             : 
     402             :       /**
     403             :        *  Returns a read-only (constant) reverse iterator that points to the
     404             :        *  last pair in the %set.  Iteration is done in descending order
     405             :        *  according to the keys.
     406             :        */
     407             :       reverse_iterator
     408             :       crend() const noexcept
     409             :       { return _M_t.rend(); }
     410             : #endif
     411             : 
     412             :       ///  Returns true if the %set is empty.
     413             :       _GLIBCXX_NODISCARD bool
     414      272289 :       empty() const _GLIBCXX_NOEXCEPT
     415      272289 :       { return _M_t.empty(); }
     416             : 
     417             :       ///  Returns the size of the %set.
     418             :       size_type
     419       81074 :       size() const _GLIBCXX_NOEXCEPT
     420       80630 :       { return _M_t.size(); }
     421             : 
     422             :       ///  Returns the maximum size of the %set.
     423             :       size_type
     424             :       max_size() const _GLIBCXX_NOEXCEPT
     425             :       { return _M_t.max_size(); }
     426             : 
     427             :       /**
     428             :        *  @brief  Swaps data with another %set.
     429             :        *  @param  __x  A %set of the same element and allocator types.
     430             :        *
     431             :        *  This exchanges the elements between two sets in constant
     432             :        *  time.  (It is only swapping a pointer, an integer, and an
     433             :        *  instance of the @c Compare type (which itself is often
     434             :        *  stateless and empty), so it should be quite fast.)  Note
     435             :        *  that the global std::swap() function is specialized such
     436             :        *  that std::swap(s1,s2) will feed to this function.
     437             :        *
     438             :        *  Whether the allocators are swapped depends on the allocator traits.
     439             :        */
     440             :       void
     441           0 :       swap(set& __x)
     442             :       _GLIBCXX_NOEXCEPT_IF(__is_nothrow_swappable<_Compare>::value)
     443           0 :       { _M_t.swap(__x._M_t); }
     444             : 
     445             :       // insert/erase
     446             : #if __cplusplus >= 201103L
     447             :       /**
     448             :        *  @brief Attempts to build and insert an element into the %set.
     449             :        *  @param __args  Arguments used to generate an element.
     450             :        *  @return  A pair, of which the first element is an iterator that points
     451             :        *           to the possibly inserted element, and the second is a bool
     452             :        *           that is true if the element was actually inserted.
     453             :        *
     454             :        *  This function attempts to build and insert an element into the %set.
     455             :        *  A %set relies on unique keys and thus an element is only inserted if
     456             :        *  it is not already present in the %set.
     457             :        *
     458             :        *  Insertion requires logarithmic time.
     459             :        */
     460             :       template<typename... _Args>
     461             :         std::pair<iterator, bool>
     462             :         emplace(_Args&&... __args)
     463             :         { return _M_t._M_emplace_unique(std::forward<_Args>(__args)...); }
     464             : 
     465             :       /**
     466             :        *  @brief Attempts to insert an element into the %set.
     467             :        *  @param  __pos  An iterator that serves as a hint as to where the
     468             :        *                element should be inserted.
     469             :        *  @param  __args  Arguments used to generate the element to be
     470             :        *                 inserted.
     471             :        *  @return An iterator that points to the element with key equivalent to
     472             :        *          the one generated from @a __args (may or may not be the
     473             :        *          element itself).
     474             :        *
     475             :        *  This function is not concerned about whether the insertion took place,
     476             :        *  and thus does not return a boolean like the single-argument emplace()
     477             :        *  does.  Note that the first parameter is only a hint and can
     478             :        *  potentially improve the performance of the insertion process.  A bad
     479             :        *  hint would cause no gains in efficiency.
     480             :        *
     481             :        *  For more on @a hinting, see:
     482             :        *  https://gcc.gnu.org/onlinedocs/libstdc++/manual/associative.html#containers.associative.insert_hints
     483             :        *
     484             :        *  Insertion requires logarithmic time (if the hint is not taken).
     485             :        */
     486             :       template<typename... _Args>
     487             :         iterator
     488             :         emplace_hint(const_iterator __pos, _Args&&... __args)
     489             :         {
     490             :           return _M_t._M_emplace_hint_unique(__pos,
     491             :                                              std::forward<_Args>(__args)...);
     492             :         }
     493             : #endif
     494             : 
     495             :       /**
     496             :        *  @brief Attempts to insert an element into the %set.
     497             :        *  @param  __x  Element to be inserted.
     498             :        *  @return  A pair, of which the first element is an iterator that points
     499             :        *           to the possibly inserted element, and the second is a bool
     500             :        *           that is true if the element was actually inserted.
     501             :        *
     502             :        *  This function attempts to insert an element into the %set.  A %set
     503             :        *  relies on unique keys and thus an element is only inserted if it is
     504             :        *  not already present in the %set.
     505             :        *
     506             :        *  Insertion requires logarithmic time.
     507             :        */
     508             :       std::pair<iterator, bool>
     509   124613059 :       insert(const value_type& __x)
     510             :       {
     511   124613059 :         std::pair<typename _Rep_type::iterator, bool> __p =
     512             :           _M_t._M_insert_unique(__x);
     513   124612888 :         return std::pair<iterator, bool>(__p.first, __p.second);
     514             :       }
     515             : 
     516             : #if __cplusplus >= 201103L
     517             :       std::pair<iterator, bool>
     518     2776753 :       insert(value_type&& __x)
     519             :       {
     520     2776039 :         std::pair<typename _Rep_type::iterator, bool> __p =
     521     2776039 :           _M_t._M_insert_unique(std::move(__x));
     522     2713725 :         return std::pair<iterator, bool>(__p.first, __p.second);
     523             :       }
     524             : #endif
     525             : 
     526             :       /**
     527             :        *  @brief Attempts to insert an element into the %set.
     528             :        *  @param  __position  An iterator that serves as a hint as to where the
     529             :        *                    element should be inserted.
     530             :        *  @param  __x  Element to be inserted.
     531             :        *  @return An iterator that points to the element with key of
     532             :        *           @a __x (may or may not be the element passed in).
     533             :        *
     534             :        *  This function is not concerned about whether the insertion took place,
     535             :        *  and thus does not return a boolean like the single-argument insert()
     536             :        *  does.  Note that the first parameter is only a hint and can
     537             :        *  potentially improve the performance of the insertion process.  A bad
     538             :        *  hint would cause no gains in efficiency.
     539             :        *
     540             :        *  For more on @a hinting, see:
     541             :        *  https://gcc.gnu.org/onlinedocs/libstdc++/manual/associative.html#containers.associative.insert_hints
     542             :        *
     543             :        *  Insertion requires logarithmic time (if the hint is not taken).
     544             :        */
     545             :       iterator
     546       63835 :       insert(const_iterator __position, const value_type& __x)
     547       63835 :       { return _M_t._M_insert_unique_(__position, __x); }
     548             : 
     549             : #if __cplusplus >= 201103L
     550             :       iterator
     551             :       insert(const_iterator __position, value_type&& __x)
     552             :       { return _M_t._M_insert_unique_(__position, std::move(__x)); }
     553             : #endif
     554             : 
     555             :       /**
     556             :        *  @brief A template function that attempts to insert a range
     557             :        *  of elements.
     558             :        *  @param  __first  Iterator pointing to the start of the range to be
     559             :        *                   inserted.
     560             :        *  @param  __last  Iterator pointing to the end of the range.
     561             :        *
     562             :        *  Complexity similar to that of the range constructor.
     563             :        */
     564             :       template<typename _InputIterator>
     565             :         void
     566      197860 :         insert(_InputIterator __first, _InputIterator __last)
     567       66072 :         { _M_t._M_insert_range_unique(__first, __last); }
     568             : 
     569             : #if __cplusplus >= 201103L
     570             :       /**
     571             :        *  @brief Attempts to insert a list of elements into the %set.
     572             :        *  @param  __l  A std::initializer_list<value_type> of elements
     573             :        *               to be inserted.
     574             :        *
     575             :        *  Complexity similar to that of the range constructor.
     576             :        */
     577             :       void
     578             :       insert(initializer_list<value_type> __l)
     579             :       { this->insert(__l.begin(), __l.end()); }
     580             : #endif
     581             : 
     582             : #if __cplusplus > 201402L
     583             :       /// Extract a node.
     584             :       node_type
     585             :       extract(const_iterator __pos)
     586             :       {
     587             :         __glibcxx_assert(__pos != end());
     588             :         return _M_t.extract(__pos);
     589             :       }
     590             : 
     591             :       /// Extract a node.
     592             :       node_type
     593             :       extract(const key_type& __x)
     594             :       { return _M_t.extract(__x); }
     595             : 
     596             :       /// Re-insert an extracted node.
     597             :       insert_return_type
     598             :       insert(node_type&& __nh)
     599             :       { return _M_t._M_reinsert_node_unique(std::move(__nh)); }
     600             : 
     601             :       /// Re-insert an extracted node.
     602             :       iterator
     603             :       insert(const_iterator __hint, node_type&& __nh)
     604             :       { return _M_t._M_reinsert_node_hint_unique(__hint, std::move(__nh)); }
     605             : 
     606             :       template<typename, typename>
     607             :         friend class std::_Rb_tree_merge_helper;
     608             : 
     609             :       template<typename _Compare1>
     610             :         void
     611             :         merge(set<_Key, _Compare1, _Alloc>& __source)
     612             :         {
     613             :           using _Merge_helper = _Rb_tree_merge_helper<set, _Compare1>;
     614             :           _M_t._M_merge_unique(_Merge_helper::_S_get_tree(__source));
     615             :         }
     616             : 
     617             :       template<typename _Compare1>
     618             :         void
     619             :         merge(set<_Key, _Compare1, _Alloc>&& __source)
     620             :         { merge(__source); }
     621             : 
     622             :       template<typename _Compare1>
     623             :         void
     624             :         merge(multiset<_Key, _Compare1, _Alloc>& __source)
     625             :         {
     626             :           using _Merge_helper = _Rb_tree_merge_helper<set, _Compare1>;
     627             :           _M_t._M_merge_unique(_Merge_helper::_S_get_tree(__source));
     628             :         }
     629             : 
     630             :       template<typename _Compare1>
     631             :         void
     632             :         merge(multiset<_Key, _Compare1, _Alloc>&& __source)
     633             :         { merge(__source); }
     634             : #endif // C++17
     635             : 
     636             : #if __cplusplus >= 201103L
     637             :       // _GLIBCXX_RESOLVE_LIB_DEFECTS
     638             :       // DR 130. Associative erase should return an iterator.
     639             :       /**
     640             :        *  @brief Erases an element from a %set.
     641             :        *  @param  __position  An iterator pointing to the element to be erased.
     642             :        *  @return An iterator pointing to the element immediately following
     643             :        *          @a __position prior to the element being erased. If no such
     644             :        *          element exists, end() is returned.
     645             :        *
     646             :        *  This function erases an element, pointed to by the given iterator,
     647             :        *  from a %set.  Note that this function only erases the element, and
     648             :        *  that if the element is itself a pointer, the pointed-to memory is not
     649             :        *  touched in any way.  Managing the pointer is the user's
     650             :        *  responsibility.
     651             :        */
     652             :       _GLIBCXX_ABI_TAG_CXX11
     653             :       iterator
     654           0 :       erase(const_iterator __position)
     655           0 :       { return _M_t.erase(__position); }
     656             : #else
     657             :       /**
     658             :        *  @brief Erases an element from a %set.
     659             :        *  @param  position  An iterator pointing to the element to be erased.
     660             :        *
     661             :        *  This function erases an element, pointed to by the given iterator,
     662             :        *  from a %set.  Note that this function only erases the element, and
     663             :        *  that if the element is itself a pointer, the pointed-to memory is not
     664             :        *  touched in any way.  Managing the pointer is the user's
     665             :        *  responsibility.
     666             :        */
     667             :       void
     668             :       erase(iterator __position)
     669             :       { _M_t.erase(__position); }
     670             : #endif
     671             : 
     672             :       /**
     673             :        *  @brief Erases elements according to the provided key.
     674             :        *  @param  __x  Key of element to be erased.
     675             :        *  @return  The number of elements erased.
     676             :        *
     677             :        *  This function erases all the elements located by the given key from
     678             :        *  a %set.
     679             :        *  Note that this function only erases the element, and that if
     680             :        *  the element is itself a pointer, the pointed-to memory is not touched
     681             :        *  in any way.  Managing the pointer is the user's responsibility.
     682             :        */
     683             :       size_type
     684       91416 :       erase(const key_type& __x)
     685       91416 :       { return _M_t.erase(__x); }
     686             : 
     687             : #if __cplusplus >= 201103L
     688             :       // _GLIBCXX_RESOLVE_LIB_DEFECTS
     689             :       // DR 130. Associative erase should return an iterator.
     690             :       /**
     691             :        *  @brief Erases a [__first,__last) range of elements from a %set.
     692             :        *  @param  __first  Iterator pointing to the start of the range to be
     693             :        *                 erased.
     694             : 
     695             :        *  @param __last Iterator pointing to the end of the range to
     696             :        *  be erased.
     697             :        *  @return The iterator @a __last.
     698             :        *
     699             :        *  This function erases a sequence of elements from a %set.
     700             :        *  Note that this function only erases the element, and that if
     701             :        *  the element is itself a pointer, the pointed-to memory is not touched
     702             :        *  in any way.  Managing the pointer is the user's responsibility.
     703             :        */
     704             :       _GLIBCXX_ABI_TAG_CXX11
     705             :       iterator
     706             :       erase(const_iterator __first, const_iterator __last)
     707             :       { return _M_t.erase(__first, __last); }
     708             : #else
     709             :       /**
     710             :        *  @brief Erases a [first,last) range of elements from a %set.
     711             :        *  @param  __first  Iterator pointing to the start of the range to be
     712             :        *                 erased.
     713             :        *  @param __last Iterator pointing to the end of the range to
     714             :        *  be erased.
     715             :        *
     716             :        *  This function erases a sequence of elements from a %set.
     717             :        *  Note that this function only erases the element, and that if
     718             :        *  the element is itself a pointer, the pointed-to memory is not touched
     719             :        *  in any way.  Managing the pointer is the user's responsibility.
     720             :        */
     721             :       void
     722             :       erase(iterator __first, iterator __last)
     723             :       { _M_t.erase(__first, __last); }
     724             : #endif
     725             : 
     726             :       /**
     727             :        *  Erases all elements in a %set.  Note that this function only erases
     728             :        *  the elements, and that if the elements themselves are pointers, the
     729             :        *  pointed-to memory is not touched in any way.  Managing the pointer is
     730             :        *  the user's responsibility.
     731             :        */
     732             :       void
     733      324597 :       clear() _GLIBCXX_NOEXCEPT
     734      324597 :       { _M_t.clear(); }
     735             : 
     736             :       // set operations:
     737             : 
     738             :       ///@{
     739             :       /**
     740             :        *  @brief  Finds the number of elements.
     741             :        *  @param  __x  Element to located.
     742             :        *  @return  Number of elements with specified key.
     743             :        *
     744             :        *  This function only makes sense for multisets; for set the result will
     745             :        *  either be 0 (not present) or 1 (present).
     746             :        */
     747             :       size_type
     748     1214770 :       count(const key_type& __x) const
     749     2429530 :       { return _M_t.find(__x) == _M_t.end() ? 0 : 1; }
     750             : 
     751             : #if __cplusplus > 201103L
     752             :       template<typename _Kt>
     753             :         auto
     754             :         count(const _Kt& __x) const
     755             :         -> decltype(_M_t._M_count_tr(__x))
     756             :         { return _M_t._M_count_tr(__x); }
     757             : #endif
     758             :       ///@}
     759             : 
     760             : #if __cplusplus > 201703L
     761             :       ///@{
     762             :       /**
     763             :        *  @brief  Finds whether an element with the given key exists.
     764             :        *  @param  __x  Key of elements to be located.
     765             :        *  @return  True if there is an element with the specified key.
     766             :        */
     767             :       bool
     768             :       contains(const key_type& __x) const
     769             :       { return _M_t.find(__x) != _M_t.end(); }
     770             : 
     771             :       template<typename _Kt>
     772             :         auto
     773             :         contains(const _Kt& __x) const
     774             :         -> decltype(_M_t._M_find_tr(__x), void(), true)
     775             :         { return _M_t._M_find_tr(__x) != _M_t.end(); }
     776             :       ///@}
     777             : #endif
     778             : 
     779             :       // _GLIBCXX_RESOLVE_LIB_DEFECTS
     780             :       // 214.  set::find() missing const overload
     781             :       ///@{
     782             :       /**
     783             :        *  @brief Tries to locate an element in a %set.
     784             :        *  @param  __x  Element to be located.
     785             :        *  @return  Iterator pointing to sought-after element, or end() if not
     786             :        *           found.
     787             :        *
     788             :        *  This function takes a key and tries to locate the element with which
     789             :        *  the key matches.  If successful the function returns an iterator
     790             :        *  pointing to the sought after element.  If unsuccessful it returns the
     791             :        *  past-the-end ( @c end() ) iterator.
     792             :        */
     793             :       iterator
     794    46373969 :       find(const key_type& __x)
     795    96464060 :       { return _M_t.find(__x); }
     796             : 
     797             :       const_iterator
     798     1182571 :       find(const key_type& __x) const
     799     2320072 :       { return _M_t.find(__x); }
     800             : 
     801             : #if __cplusplus > 201103L
     802             :       template<typename _Kt>
     803             :         auto
     804             :         find(const _Kt& __x)
     805             :         -> decltype(iterator{_M_t._M_find_tr(__x)})
     806             :         { return iterator{_M_t._M_find_tr(__x)}; }
     807             : 
     808             :       template<typename _Kt>
     809             :         auto
     810             :         find(const _Kt& __x) const
     811             :         -> decltype(const_iterator{_M_t._M_find_tr(__x)})
     812             :         { return const_iterator{_M_t._M_find_tr(__x)}; }
     813             : #endif
     814             :       ///@}
     815             : 
     816             :       ///@{
     817             :       /**
     818             :        *  @brief Finds the beginning of a subsequence matching given key.
     819             :        *  @param  __x  Key to be located.
     820             :        *  @return  Iterator pointing to first element equal to or greater
     821             :        *           than key, or end().
     822             :        *
     823             :        *  This function returns the first element of a subsequence of elements
     824             :        *  that matches the given key.  If unsuccessful it returns an iterator
     825             :        *  pointing to the first element that has a greater value than given key
     826             :        *  or end() if no such element exists.
     827             :        */
     828             :       iterator
     829             :       lower_bound(const key_type& __x)
     830             :       { return _M_t.lower_bound(__x); }
     831             : 
     832             :       const_iterator
     833             :       lower_bound(const key_type& __x) const
     834             :       { return _M_t.lower_bound(__x); }
     835             : 
     836             : #if __cplusplus > 201103L
     837             :       template<typename _Kt>
     838             :         auto
     839             :         lower_bound(const _Kt& __x)
     840             :         -> decltype(iterator(_M_t._M_lower_bound_tr(__x)))
     841             :         { return iterator(_M_t._M_lower_bound_tr(__x)); }
     842             : 
     843             :       template<typename _Kt>
     844             :         auto
     845             :         lower_bound(const _Kt& __x) const
     846             :         -> decltype(const_iterator(_M_t._M_lower_bound_tr(__x)))
     847             :         { return const_iterator(_M_t._M_lower_bound_tr(__x)); }
     848             : #endif
     849             :       ///@}
     850             : 
     851             :       ///@{
     852             :       /**
     853             :        *  @brief Finds the end of a subsequence matching given key.
     854             :        *  @param  __x  Key to be located.
     855             :        *  @return Iterator pointing to the first element
     856             :        *          greater than key, or end().
     857             :        */
     858             :       iterator
     859             :       upper_bound(const key_type& __x)
     860             :       { return _M_t.upper_bound(__x); }
     861             : 
     862             :       const_iterator
     863             :       upper_bound(const key_type& __x) const
     864             :       { return _M_t.upper_bound(__x); }
     865             : 
     866             : #if __cplusplus > 201103L
     867             :       template<typename _Kt>
     868             :         auto
     869             :         upper_bound(const _Kt& __x)
     870             :         -> decltype(iterator(_M_t._M_upper_bound_tr(__x)))
     871             :         { return iterator(_M_t._M_upper_bound_tr(__x)); }
     872             : 
     873             :       template<typename _Kt>
     874             :         auto
     875             :         upper_bound(const _Kt& __x) const
     876             :         -> decltype(iterator(_M_t._M_upper_bound_tr(__x)))
     877             :         { return const_iterator(_M_t._M_upper_bound_tr(__x)); }
     878             : #endif
     879             :       ///@}
     880             : 
     881             :       ///@{
     882             :       /**
     883             :        *  @brief Finds a subsequence matching given key.
     884             :        *  @param  __x  Key to be located.
     885             :        *  @return  Pair of iterators that possibly points to the subsequence
     886             :        *           matching given key.
     887             :        *
     888             :        *  This function is equivalent to
     889             :        *  @code
     890             :        *    std::make_pair(c.lower_bound(val),
     891             :        *                   c.upper_bound(val))
     892             :        *  @endcode
     893             :        *  (but is faster than making the calls separately).
     894             :        *
     895             :        *  This function probably only makes sense for multisets.
     896             :        */
     897             :       std::pair<iterator, iterator>
     898             :       equal_range(const key_type& __x)
     899             :       { return _M_t.equal_range(__x); }
     900             : 
     901             :       std::pair<const_iterator, const_iterator>
     902             :       equal_range(const key_type& __x) const
     903             :       { return _M_t.equal_range(__x); }
     904             : 
     905             : #if __cplusplus > 201103L
     906             :       template<typename _Kt>
     907             :         auto
     908             :         equal_range(const _Kt& __x)
     909             :         -> decltype(pair<iterator, iterator>(_M_t._M_equal_range_tr(__x)))
     910             :         { return pair<iterator, iterator>(_M_t._M_equal_range_tr(__x)); }
     911             : 
     912             :       template<typename _Kt>
     913             :         auto
     914             :         equal_range(const _Kt& __x) const
     915             :         -> decltype(pair<iterator, iterator>(_M_t._M_equal_range_tr(__x)))
     916             :         { return pair<iterator, iterator>(_M_t._M_equal_range_tr(__x)); }
     917             : #endif
     918             :       ///@}
     919             : 
     920             :       template<typename _K1, typename _C1, typename _A1>
     921             :         friend bool
     922             :         operator==(const set<_K1, _C1, _A1>&, const set<_K1, _C1, _A1>&);
     923             : 
     924             :       template<typename _K1, typename _C1, typename _A1>
     925             :         friend bool
     926             :         operator<(const set<_K1, _C1, _A1>&, const set<_K1, _C1, _A1>&);
     927             :     };
     928             : 
     929             : #if __cpp_deduction_guides >= 201606
     930             : 
     931             :   template<typename _InputIterator,
     932             :            typename _Compare =
     933             :              less<typename iterator_traits<_InputIterator>::value_type>,
     934             :            typename _Allocator =
     935             :              allocator<typename iterator_traits<_InputIterator>::value_type>,
     936             :            typename = _RequireInputIter<_InputIterator>,
     937             :            typename = _RequireNotAllocator<_Compare>,
     938             :            typename = _RequireAllocator<_Allocator>>
     939             :     set(_InputIterator, _InputIterator,
     940             :         _Compare = _Compare(), _Allocator = _Allocator())
     941             :     -> set<typename iterator_traits<_InputIterator>::value_type,
     942             :           _Compare, _Allocator>;
     943             : 
     944             :   template<typename _Key, typename _Compare = less<_Key>,
     945             :            typename _Allocator = allocator<_Key>,
     946             :            typename = _RequireNotAllocator<_Compare>,
     947             :            typename = _RequireAllocator<_Allocator>>
     948             :     set(initializer_list<_Key>,
     949             :         _Compare = _Compare(), _Allocator = _Allocator())
     950             :     -> set<_Key, _Compare, _Allocator>;
     951             : 
     952             :   template<typename _InputIterator, typename _Allocator,
     953             :            typename = _RequireInputIter<_InputIterator>,
     954             :            typename = _RequireAllocator<_Allocator>>
     955             :     set(_InputIterator, _InputIterator, _Allocator)
     956             :     -> set<typename iterator_traits<_InputIterator>::value_type,
     957             :            less<typename iterator_traits<_InputIterator>::value_type>,
     958             :            _Allocator>;
     959             : 
     960             :   template<typename _Key, typename _Allocator,
     961             :            typename = _RequireAllocator<_Allocator>>
     962             :     set(initializer_list<_Key>, _Allocator)
     963             :     -> set<_Key, less<_Key>, _Allocator>;
     964             : 
     965             : #endif
     966             : 
     967             :   /**
     968             :    *  @brief  Set equality comparison.
     969             :    *  @param  __x  A %set.
     970             :    *  @param  __y  A %set of the same type as @a x.
     971             :    *  @return  True iff the size and elements of the sets are equal.
     972             :    *
     973             :    *  This is an equivalence relation.  It is linear in the size of the sets.
     974             :    *  Sets are considered equivalent if their sizes are equal, and if
     975             :    *  corresponding elements compare equal.
     976             :   */
     977             :   template<typename _Key, typename _Compare, typename _Alloc>
     978             :     inline bool
     979         444 :     operator==(const set<_Key, _Compare, _Alloc>& __x,
     980             :                const set<_Key, _Compare, _Alloc>& __y)
     981         444 :     { return __x._M_t == __y._M_t; }
     982             : 
     983             :   /**
     984             :    *  @brief  Set ordering relation.
     985             :    *  @param  __x  A %set.
     986             :    *  @param  __y  A %set of the same type as @a x.
     987             :    *  @return  True iff @a __x is lexicographically less than @a __y.
     988             :    *
     989             :    *  This is a total ordering relation.  It is linear in the size of the
     990             :    *  sets.  The elements must be comparable with @c <.
     991             :    *
     992             :    *  See std::lexicographical_compare() for how the determination is made.
     993             :   */
     994             :   template<typename _Key, typename _Compare, typename _Alloc>
     995             :     inline bool
     996           0 :     operator<(const set<_Key, _Compare, _Alloc>& __x,
     997             :               const set<_Key, _Compare, _Alloc>& __y)
     998           0 :     { return __x._M_t < __y._M_t; }
     999             : 
    1000             :   ///  Returns !(x == y).
    1001             :   template<typename _Key, typename _Compare, typename _Alloc>
    1002             :     inline bool
    1003         444 :     operator!=(const set<_Key, _Compare, _Alloc>& __x,
    1004             :                const set<_Key, _Compare, _Alloc>& __y)
    1005         444 :     { return !(__x == __y); }
    1006             : 
    1007             :   ///  Returns y < x.
    1008             :   template<typename _Key, typename _Compare, typename _Alloc>
    1009             :     inline bool
    1010             :     operator>(const set<_Key, _Compare, _Alloc>& __x,
    1011             :               const set<_Key, _Compare, _Alloc>& __y)
    1012             :     { return __y < __x; }
    1013             : 
    1014             :   ///  Returns !(y < x)
    1015             :   template<typename _Key, typename _Compare, typename _Alloc>
    1016             :     inline bool
    1017             :     operator<=(const set<_Key, _Compare, _Alloc>& __x,
    1018             :                const set<_Key, _Compare, _Alloc>& __y)
    1019             :     { return !(__y < __x); }
    1020             : 
    1021             :   ///  Returns !(x < y)
    1022             :   template<typename _Key, typename _Compare, typename _Alloc>
    1023             :     inline bool
    1024             :     operator>=(const set<_Key, _Compare, _Alloc>& __x,
    1025             :                const set<_Key, _Compare, _Alloc>& __y)
    1026             :     { return !(__x < __y); }
    1027             : 
    1028             :   /// See std::set::swap().
    1029             :   template<typename _Key, typename _Compare, typename _Alloc>
    1030             :     inline void
    1031             :     swap(set<_Key, _Compare, _Alloc>& __x, set<_Key, _Compare, _Alloc>& __y)
    1032             :     _GLIBCXX_NOEXCEPT_IF(noexcept(__x.swap(__y)))
    1033             :     { __x.swap(__y); }
    1034             : 
    1035             : _GLIBCXX_END_NAMESPACE_CONTAINER
    1036             : 
    1037             : #if __cplusplus > 201402L
    1038             :   // Allow std::set access to internals of compatible sets.
    1039             :   template<typename _Val, typename _Cmp1, typename _Alloc, typename _Cmp2>
    1040             :     struct
    1041             :     _Rb_tree_merge_helper<_GLIBCXX_STD_C::set<_Val, _Cmp1, _Alloc>, _Cmp2>
    1042             :     {
    1043             :     private:
    1044             :       friend class _GLIBCXX_STD_C::set<_Val, _Cmp1, _Alloc>;
    1045             : 
    1046             :       static auto&
    1047             :       _S_get_tree(_GLIBCXX_STD_C::set<_Val, _Cmp2, _Alloc>& __set)
    1048             :       { return __set._M_t; }
    1049             : 
    1050             :       static auto&
    1051             :       _S_get_tree(_GLIBCXX_STD_C::multiset<_Val, _Cmp2, _Alloc>& __set)
    1052             :       { return __set._M_t; }
    1053             :     };
    1054             : #endif // C++17
    1055             : 
    1056             : _GLIBCXX_END_NAMESPACE_VERSION
    1057             : } //namespace std
    1058             : #endif /* _STL_SET_H */

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