stl_set.h

mingw32.rar

// Set implementation -*- C++ -*-

// Copyright (C) 2001, 2002, 2004 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 2, 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.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.

/*
 *
 * 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) 1996,1997
 * 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 stl_set.h
 *  This is an internal header file, included by other library headers.
 *  You should not attempt to use it directly.
 */

#ifndef _SET_H
#define _SET_H 1

#include <bits/concept_check.h>

namespace _GLIBCXX_STD
{
  // Forward declarations of operators < and ==, needed for friend declaration.
  template<class _Key, class _Compare = less<_Key>,
	   class _Alloc = allocator<_Key> >
    class set;

  template<class _Key, class _Compare, class _Alloc>
    inline bool
    operator==(const set<_Key,_Compare,_Alloc>& __x,
	       const set<_Key,_Compare,_Alloc>& __y);

  template<class _Key, class _Compare, class _Alloc>
    inline bool
    operator<(const set<_Key,_Compare,_Alloc>& __x,
	      const set<_Key,_Compare,_Alloc>& __y);

  /**
   *  @brief A standard container made up of unique keys, which can be
   *  retrieved in logarithmic time.
   *
   *  @ingroup Containers
   *  @ingroup Assoc_containers
   *
   *  Meets the requirements of a <a href="tables.html#65">container</a>, a
   *  <a href="tables.html#66">reversible container</a>, and an
   *  <a href="tables.html#69">associative container</a> (using unique keys).
   *
   *  Sets support bidirectional iterators.
   *
   *  @param  Key  Type of key objects.
   *  @param  Compare  Comparison function object type, defaults to less<Key>.
   *  @param  Alloc  Allocator type, defaults to allocator<Key>.
   *
   *  @if maint
   *  The private tree data is declared exactly the same way for set and
   *  multiset; the distinction is made entirely in how the tree functions are
   *  called (*_unique versus *_equal, same as the standard).
   *  @endif
  */
  template<class _Key, class _Compare, class _Alloc>
    class set
    {
      // concept requirements
      __glibcxx_class_requires(_Key, _SGIAssignableConcept)
      __glibcxx_class_requires4(_Compare, bool, _Key, _Key,
				_BinaryFunctionConcept)

    public:
      // typedefs:
      //@{
      /// Public typedefs.
      typedef _Key     key_type;
      typedef _Key     value_type;
      typedef _Compare key_compare;
      typedef _Compare value_compare;
      //@}

    private:
      typedef _Rb_tree<key_type, value_type,
		       _Identity<value_type>, key_compare, _Alloc> _Rep_type;
      _Rep_type _M_t;  // red-black tree representing set
    public:
      //@{
      ///  Iterator-related typedefs.
      typedef typename _Alloc::pointer pointer;
      typedef typename _Alloc::const_pointer const_pointer;
      typedef typename _Alloc::reference reference;
      typedef typename _Alloc::const_reference const_reference;
      // _GLIBCXX_RESOLVE_LIB_DEFECTS
      // DR 103. set::iterator is required to be modifiable,
      // but this allows modification of keys.
      typedef typename _Rep_type::const_iterator iterator;
      typedef typename _Rep_type::const_iterator const_iterator;
      typedef typename _Rep_type::const_reverse_iterator reverse_iterator;
      typedef typename _Rep_type::const_reverse_iterator const_reverse_iterator;
      typedef typename _Rep_type::size_type size_type;
      typedef typename _Rep_type::difference_type difference_type;
      typedef typename _Rep_type::allocator_type allocator_type;
      //@}

      // allocation/deallocation
      ///  Default constructor creates no elements.
      set()
      : _M_t(_Compare(), allocator_type()) {}

      /**
       *  @brief  Default constructor creates no elements.
       *
       *  @param  comp  Comparator to use.
       *  @param  a  Allocator to use.
       */
      explicit set(const _Compare& __comp,
		   const allocator_type& __a = allocator_type())
      : _M_t(__comp, __a) {}

      /**
       *  @brief  Builds a %set from a range.
       *  @param  first  An input iterator.
       *  @param  last  An input iterator.
       *
       *  Create a %set consisting of copies of the elements from [first,last).
       *  This is linear in N if the range is already sorted, and NlogN
       *  otherwise (where N is distance(first,last)).
       */
      template<class _InputIterator>
        set(_InputIterator __first, _InputIterator __last)
        : _M_t(_Compare(), allocator_type())
        { _M_t.insert_unique(__first, __last); }

      /**
       *  @brief  Builds a %set from a range.
       *  @param  first  An input iterator.
       *  @param  last  An input iterator.
       *  @param  comp  A comparison functor.
       *  @param  a  An allocator object.
       *
       *  Create a %set consisting of copies of the elements from [first,last).
       *  This is linear in N if the range is already sorted, and NlogN
       *  otherwise (where N is distance(first,last)).
       */
      template<class _InputIterator>
        set(_InputIterator __first, _InputIterator __last,
	    const _Compare& __comp,
	    const allocator_type& __a = allocator_type())
	: _M_t(__comp, __a)
        { _M_t.insert_unique(__first, __last); }

      /**
       *  @brief  Set copy constructor.
       *  @param  x  A %set of identical element and allocator types.
       *
       *  The newly-created %set uses a copy of the allocation object used
       *  by @a x.
       */
      set(const set<_Key,_Compare,_Alloc>& __x)
      : _M_t(__x._M_t) { }

      /**
       *  @brief  Set assignment operator.
       *  @param  x  A %set of identical element and allocator types.
       *
       *  All the elements of @a x are copied, but unlike the copy constructor,
       *  the allocator object is not copied.
       */
      set<_Key,_Compare,_Alloc>&
      operator=(const set<_Key, _Compare, _Alloc>& __x)
      {
	_M_t = __x._M_t;
	return *this;
      }

      // accessors:

      ///  Returns the comparison object with which the %set was constructed.
      key_compare
      key_comp() const
      { return _M_t.key_comp(); }
      ///  Returns the comparison object with which the %set was constructed.
      value_compare
      value_comp() const
      { return _M_t.key_comp(); }
      ///  Returns the allocator object with which the %set was constructed.
      allocator_type
      get_allocator() const
      { return _M_t.get_allocator(); }

      /**
       *  Returns a read/write iterator that points to the first element in the
       *  %set.  Iteration is done in ascending order according to the keys.
       */
      iterator
      begin() const
      { return _M_t.begin(); }

      /**
       *  Returns a read/write iterator that points one past the last element in
       *  the %set.  Iteration is done in ascending order according to the keys.
       */
      iterator
      end() const
      { return _M_t.end(); }

      /**
       *  Returns a read/write reverse iterator that points to the last element
       *  in the %set.  Iteration is done in descending order according to the
       *  keys.
       */
      reverse_iterator
      rbegin() const
      { return _M_t.rbegin(); }

      /**
       *  Returns a read-only (constant) reverse iterator that points to the
       *  last pair in the %map.  Iteration is done in descending order
       *  according to the keys.
       */
      reverse_iterator
      rend() const
      { return _M_t.rend(); }

      ///  Returns true if the %set is empty.
      bool
      empty() const
      { return _M_t.empty(); }

      ///  Returns the size of the %set.
      size_type
      size() const
      { return _M_t.size(); }

      ///  Returns the maximum size of the %set.
      size_type
      max_size() const
      { return _M_t.max_size(); }

      /**
       *  @brief  Swaps data with another %set.
       *  @param  x  A %set of the same element and allocator types.
       *
       *  This exchanges the elements between two sets in constant time.
       *  (It is only swapping a pointer, an integer, and an instance of
       *  the @c Compare type (which itself is often stateless and empty), so it
       *  should be quite fast.)
       *  Note that the global std::swap() function is specialized such that
       *  std::swap(s1,s2) will feed to this function.
       */
      void
      swap(set<_Key,_Compare,_Alloc>& __x)
      { _M_t.swap(__x._M_t); }

      // insert/erase