flat_set.hpp

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//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2005-2008. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/interprocess for documentation.
//
//////////////////////////////////////////////////////////////////////////////

#ifndef BOOST_INTERPROCESS_FLAT_SET_HPP
#define BOOST_INTERPROCESS_FLAT_SET_HPP

#if (defined _MSC_VER) && (_MSC_VER >= 1200)
#  pragma once
#endif

#include <boost/interprocess/detail/config_begin.hpp>
#include <boost/interprocess/detail/workaround.hpp>

#include <boost/interprocess/interprocess_fwd.hpp>
#include <utility>
#include <functional>
#include <memory>
#include <boost/interprocess/containers/detail/flat_tree.hpp>
#include <boost/interprocess/detail/mpl.hpp>
#include <boost/interprocess/detail/move.hpp>


namespace boost {   namespace interprocess {

/// @cond
// Forward declarations of operators < and ==, needed for friend declaration.

template <class T, class Pred, class Alloc>
class flat_set;

template <class T, class Pred, class Alloc>
inline bool operator==(const flat_set<T,Pred,Alloc>& x, 
                       const flat_set<T,Pred,Alloc>& y);

template <class T, class Pred, class Alloc>
inline bool operator<(const flat_set<T,Pred,Alloc>& x, 
                      const flat_set<T,Pred,Alloc>& y);
/// @endcond

//! flat_set is a Sorted Associative Container that stores objects of type Key. 
//! flat_set is a Simple Associative Container, meaning that its value type, 
//! as well as its key type, is Key. It is also a Unique Associative Container, 
//! meaning that no two elements are the same. 
//! 
//! flat_set is similar to std::set but it's implemented like an ordered vector.
//! This means that inserting a new element into a flat_set invalidates
//! previous iterators and references
//!
//! Erasing an element of a flat_set invalidates iterators and references 
//! pointing to elements that come after (their keys are bigger) the erased element.
template <class T, class Pred, class Alloc>
class flat_set 
{
   /// @cond
   private:
   typedef detail::flat_tree<T, T, detail::identity<T>, Pred, Alloc> tree_t;
   tree_t m_flat_tree;  // flat tree representing flat_set
   /// @endcond

   public:
   // typedefs:
   typedef typename tree_t::key_type               key_type;
   typedef typename tree_t::value_type             value_type;
   typedef typename tree_t::pointer                pointer;
   typedef typename tree_t::const_pointer          const_pointer;
   typedef typename tree_t::reference              reference;
   typedef typename tree_t::const_reference        const_reference;
   typedef typename tree_t::key_compare            key_compare;
   typedef typename tree_t::value_compare          value_compare;
   typedef typename tree_t::iterator               iterator;
   typedef typename tree_t::const_iterator         const_iterator;
   typedef typename tree_t::reverse_iterator       reverse_iterator;
   typedef typename tree_t::const_reverse_iterator const_reverse_iterator;
   typedef typename tree_t::size_type              size_type;
   typedef typename tree_t::difference_type        difference_type;
   typedef typename tree_t::allocator_type         allocator_type;
   typedef typename tree_t::stored_allocator_type  stored_allocator_type;

   //! <b>Effects</b>: Constructs an empty flat_map using the specified
   //! comparison object and allocator.
   //! 
   //! <b>Complexity</b>: Constant.
   explicit flat_set(const Pred& comp = Pred(),
                     const allocator_type& a = allocator_type())
      : m_flat_tree(comp, a)
   {}

   //! <b>Effects</b>: Constructs an empty map using the specified comparison object and 
   //! allocator, and inserts elements from the range [first ,last ).
   //! 
   //! <b>Complexity</b>: Linear in N if the range [first ,last ) is already sorted using 
   //! comp and otherwise N logN, where N is last - first.
   template <class InputIterator>
   flat_set(InputIterator first, InputIterator last, 
            const Pred& comp = Pred(),
            const allocator_type& a = allocator_type())
      : m_flat_tree(comp, a) 
      { m_flat_tree.insert_unique(first, last); }

   //! <b>Effects</b>: Copy constructs a map.
   //! 
   //! <b>Complexity</b>: Linear in x.size().
   flat_set(const flat_set<T,Pred,Alloc>& x) 
      : m_flat_tree(x.m_flat_tree) {}

   //! <b>Effects</b>: Move constructs a map. Constructs *this using x's resources.
   //! 
   //! <b>Complexity</b>: Construct.
   //! 
   //! <b>Postcondition</b>: x is emptied.
   #ifndef BOOST_INTERPROCESS_RVALUE_REFERENCE
   flat_set(const detail::moved_object<flat_set<T,Pred,Alloc> >& mx) 
      : m_flat_tree(detail::move_impl(mx.get().m_flat_tree)) {}
   #else
   flat_set(flat_set<T,Pred,Alloc> && mx) 
      : m_flat_tree(detail::move_impl(mx.m_flat_tree)) {}
   #endif

   //! <b>Effects</b>: Makes *this a copy of x.
   //! 
   //! <b>Complexity</b>: Linear in x.size().
   flat_set<T,Pred,Alloc>& operator=(const flat_set<T, Pred, Alloc>& x)
      {  m_flat_tree = x.m_flat_tree;   return *this;  }

   //! <b>Effects</b>: Makes *this a copy of x.
   //! 
   //! <b>Complexity</b>: Linear in x.size().
   #ifndef BOOST_INTERPROCESS_RVALUE_REFERENCE
   flat_set<T,Pred,Alloc>& operator=(const detail::moved_object<flat_set<T, Pred, Alloc> > &mx)
      {  m_flat_tree = detail::move_impl(mx.get().m_flat_tree);   return *this;  }

   #else
   flat_set<T,Pred,Alloc>& operator=(flat_set<T, Pred, Alloc> &&mx)
      {  m_flat_tree = detail::move_impl(mx.m_flat_tree);   return *this;  }

   #endif

   //! <b>Effects</b>: Returns the comparison object out
   //!   of which a was constructed.
   //! 
   //! <b>Complexity</b>: Constant.
   key_compare key_comp() const 
      { return m_flat_tree.key_comp(); }

   //! <b>Effects</b>: Returns an object of value_compare constructed out
   //!   of the comparison object.
   //! 
   //! <b>Complexity</b>: Constant.
   value_compare value_comp() const 
      { return m_flat_tree.key_comp(); }

   //! <b>Effects</b>: Returns a copy of the Allocator that
   //!   was passed to the object's constructor.
   //! 
   //! <b>Complexity</b>: Constant.
   allocator_type get_allocator() const 
      { return m_flat_tree.get_allocator(); }

   const stored_allocator_type &get_stored_allocator() const 
   {  return m_flat_tree.get_stored_allocator(); }

   stored_allocator_type &get_stored_allocator()
   {  return m_flat_tree.get_stored_allocator(); }

   //! <b>Effects</b>: Returns an iterator to the first element contained in the container.
   //! 
   //! <b>Throws</b>: Nothing.
   //! 
   //! <b>Complexity</b>: Constant.
   iterator begin() 
      { return m_flat_tree.begin(); }

   //! <b>Effects</b>: Returns a const_iterator to the first element contained in the container.
   //! 
   //! <b>Throws</b>: Nothing.
   //! 
   //! <b>Complexity</b>: Constant.
   const_iterator begin() const 
      { return m_flat_tree.begin(); }

   //! <b>Effects</b>: Returns a const_iterator to the first element contained in the container.
   //! 
   //! <b>Throws</b>: Nothing.
   //! 
   //! <b>Complexity</b>: Constant.
   const_iterator cbegin() const 
      { return m_flat_tree.cbegin(); }

   //! <b>Effects</b>: Returns an iterator to the end of the container.
   //! 
   //! <b>Throws</b>: Nothing.
   //! 
   //! <b>Complexity</b>: Constant.
   iterator end() 
      { return m_flat_tree.end(); }

   //! <b>Effects</b>: Returns a const_iterator to the end of the container.
   //! 
   //! <b>Throws</b>: Nothing.
   //! 
   //! <b>Complexity</b>: Constant.
   const_iterator end() const 
      { return m_flat_tree.end(); }

   //! <b>Effects</b>: Returns a const_iterator to the end of the container.
   //! 
   //! <b>Throws</b>: Nothing.
   //! 
   //! <b>Complexity</b>: Constant.
   const_iterator cend() const 
      { return m_flat_tree.cend(); }

   //! <b>Effects</b>: Returns a reverse_iterator pointing to the beginning 
   //! of the reversed container. 
   //! 
   //! <b>Throws</b>: Nothing.
   //! 
   //! <b>Complexity</b>: Constant.
   reverse_iterator rbegin() 
      { return m_flat_tree.rbegin(); } 

   //! <b>Effects</b>: Returns a const_reverse_iterator pointing to the beginning 
   //! of the reversed container. 
   //! 
   //! <b>Throws</b>: Nothing.
   //! 
   //! <b>Complexity</b>: Constant.
   const_reverse_iterator rbegin() const 
      { return m_flat_tree.rbegin(); } 

   //! <b>Effects</b>: Returns a const_reverse_iterator pointing to the beginning 
   //! of the reversed container. 
   //! 
   //! <b>Throws</b>: Nothing.
   //! 
   //! <b>Complexity</b>: Constant.
   const_reverse_iterator crbegin() const 
      { return m_flat_tree.crbegin(); } 

   //! <b>Effects</b>: Returns a reverse_iterator pointing to the end
   //! of the reversed container. 
   //! 
   //! <b>Throws</b>: Nothing.
   //! 
   //! <b>Complexity</b>: Constant.
   reverse_iterator rend()
      { return m_flat_tree.rend(); }

   //! <b>Effects</b>: Returns a const_reverse_iterator pointing to the end
   //! of the reversed container. 
   //! 
   //! <b>Throws</b>: Nothing.
   //! 
   //! <b>Complexity</b>: Constant.
   const_reverse_iterator rend() const 
      { return m_flat_tree.rend(); }

   //! <b>Effects</b>: Returns a const_reverse_iterator pointing to the end
   //! of the reversed container. 
   //! 
   //! <b>Throws</b>: Nothing.
   //! 
   //! <b>Complexity</b>: Constant.
   const_reverse_iterator crend() const 
      { return m_flat_tree.crend(); }

   //! <b>Effects</b>: Returns true if the container contains no elements.
   //! 
   //! <b>Throws</b>: Nothing.
   //! 
   //! <b>Complexity</b>: Constant.
   bool empty() const 
      { return m_flat_tree.empty(); }

   //! <b>Effects</b>: Returns the number of the elements contained in the container.
   //! 
   //! <b>Throws</b>: Nothing.
   //! 
   //! <b>Complexity</b>: Constant.
   size_type size() const 
      { return m_flat_tree.size(); }

   //! <b>Effects</b>: Returns the largest possible size of the container.
   //! 
   //! <b>Throws</b>: Nothing.
   //! 
   //! <b>Complexity</b>: Constant.
   size_type max_size() const 
      { return m_flat_tree.max_size(); }

   //! <b>Effects</b>: Swaps the contents of *this and x.
   //!   If this->allocator_type() != x.allocator_type() allocators are also swapped.
   //!
   //! <b>Throws</b>: Nothing.
   //!
   //! <b>Complexity</b>: Constant.
   void swap(flat_set<T,Pred,Alloc>& x) 
      { m_flat_tree.swap(x.m_flat_tree); }

   //! <b>Effects</b>: Swaps the contents of *this and x.
   //!   If this->allocator_type() != x.allocator_type() allocators are also swapped.
   //!
   //! <b>Throws</b>: Nothing.
   //!
   //! <b>Complexity</b>: Constant.
   #ifndef BOOST_INTERPROCESS_RVALUE_REFERENCE
   void swap(const detail::moved_object <flat_set<T,Pred,Alloc> >& mx) 
      { this->swap(mx.get()); }
   #else
   void swap(flat_set<T,Pred,Alloc> && mx) 
      { this->swap(mx); }