--- /dev/null
+/*
+ This file is a part of libcds - Concurrent Data Structures library
+
+ (C) Copyright Maxim Khizhinsky (libcds.dev@gmail.com) 2006-2017
+
+ Source code repo: http://github.com/khizmax/libcds/
+ Download: http://sourceforge.net/projects/libcds/files/
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright notice, this
+ list of conditions and the following disclaimer.
+
+ * Redistributions in binary form must reproduce the above copyright notice,
+ this list of conditions and the following disclaimer in the documentation
+ and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef CDSLIB_CONTAINER_SKIP_LIST_MAP_NOGC_H
+#define CDSLIB_CONTAINER_SKIP_LIST_MAP_NOGC_H
+
+#include <cds/container/skip_list_set_nogc.h>
+
+namespace cds { namespace container {
+ //@cond
+ namespace skip_list { namespace details {
+ struct map_key_accessor
+ {
+ template <typename NodeType>
+ typename NodeType::stored_value_type::first_type const& operator()( NodeType const& node ) const
+ {
+ return node.m_Value.first;
+ }
+ };
+ }} // namespace skip_list::details
+ //@endcond
+
+ /// Lock-free skip-list map (template specialization for gc::nogc)
+ /** @ingroup cds_nonintrusive_map
+ \anchor cds_nonintrusive_SkipListMap_nogc
+
+ This specialization is intended for so-called persistent usage when no item
+ reclamation may be performed. The class does not support deleting of map item.
+ See \ref cds_nonintrusive_SkipListMap_hp "SkipListMap" for detailed description.
+
+ Template arguments:
+ - \p K - type of a key to be stored in the map.
+ - \p T - type of a value to be stored in the map.
+ - \p Traits - map traits, default is \p skip_list::traits
+ It is possible to declare option-based list with \p cds::container::skip_list::make_traits
+ metafunction istead of \p Traits template argument.
+ */
+ template <
+ typename Key,
+ typename T,
+#ifdef CDS_DOXYGEN_INVOKED
+ typename Traits = skip_list::traits
+#else
+ typename Traits
+#endif
+ >
+ class SkipListMap< cds::gc::nogc, Key, T, Traits >:
+#ifdef CDS_DOXYGEN_INVOKED
+ protected SkipListSet< cds::gc::nogc, std::pair< Key const, T >, Traits >
+#else
+ protected SkipListSet<
+ cds::gc::nogc
+ ,std::pair< Key const, T >
+ ,typename cds::opt::replace_key_accessor< Traits, skip_list::details::map_key_accessor >::type
+ >
+#endif
+ {
+ //@cond
+ typedef SkipListSet<
+ cds::gc::nogc
+ ,std::pair< Key const, T >
+ ,typename cds::opt::replace_key_accessor< Traits, skip_list::details::map_key_accessor >::type
+ > base_class;
+ //@endcond
+
+ public:
+ typedef cds::gc::nogc gc; ///< Garbage collector
+ typedef Key key_type; ///< Key type
+ typedef T mapped_type; ///< Mapped type
+ typedef std::pair< key_type const, mapped_type> value_type; ///< Key-value pair stored in the map
+ typedef Traits traits; ///< Options specified
+
+ typedef typename base_class::back_off back_off; ///< Back-off strategy
+ typedef typename base_class::allocator_type allocator_type; ///< Allocator type used for allocate/deallocate the skip-list nodes
+ typedef typename base_class::item_counter item_counter; ///< Item counting policy
+ typedef typename base_class::key_comparator key_comparator; ///< key compare functor
+ typedef typename base_class::memory_model memory_model; ///< Memory ordering, see \p cds::opt::memory_model option
+ typedef typename base_class::stat stat; ///< internal statistics type
+ typedef typename base_class::random_level_generator random_level_generator; ///< random level generator
+
+ protected:
+ //@cond
+ typedef typename base_class::node_type node_type;
+ typedef typename base_class::node_allocator node_allocator;
+ //@endcond
+
+ public:
+ /// Default constructor
+ SkipListMap()
+ : base_class()
+ {}
+
+ /// Destructor clears the map
+ ~SkipListMap()
+ {}
+
+ public:
+ ///@name Forward ordered iterators
+ //@{
+ /// Forward iterator
+ /**
+ The forward iterator for a split-list has some features:
+ - it has no post-increment operator
+ - it depends on iterator of underlying \p OrderedList
+ */
+ typedef typename base_class::iterator iterator;
+
+ /// Const forward iterator
+ typedef typename base_class::const_iterator const_iterator;
+
+ /// Returns a forward iterator addressing the first element in a map
+ /**
+ For empty set \code begin() == end() \endcode
+ */
+ iterator begin()
+ {
+ return base_class::begin();
+ }
+
+ /// Returns an iterator that addresses the location succeeding the last element in a map
+ /**
+ Do not use the value returned by <tt>end</tt> function to access any item.
+ The returned value can be used only to control reaching the end of the set.
+ For empty set \code begin() == end() \endcode
+ */
+ iterator end()
+ {
+ return base_class::end();
+ }
+
+ /// Returns a forward const iterator addressing the first element in a map
+ const_iterator begin() const
+ {
+ return base_class::begin();
+ }
+
+ /// Returns a forward const iterator addressing the first element in a map
+ const_iterator cbegin() const
+ {
+ return base_class::cbegin();
+ }
+
+ /// Returns an const iterator that addresses the location succeeding the last element in a map
+ const_iterator end() const
+ {
+ return base_class::end();
+ }
+
+ /// Returns an const iterator that addresses the location succeeding the last element in a map
+ const_iterator cend() const
+ {
+ return base_class::cend();
+ }
+ //@}
+
+ public:
+ /// Inserts new node with key and default value
+ /**
+ The function creates a node with \p key and default value, and then inserts the node created into the map.
+
+ Preconditions:
+ - The \ref key_type should be constructible from value of type \p K.
+ In trivial case, \p K is equal to \ref key_type.
+ - The \ref mapped_type should be default-constructible.
+
+ Returns an iterator pointed to inserted value, or \p end() if inserting is failed
+ */
+ template <typename K>
+ iterator insert( K const& key )
+ {
+ //TODO: pass arguments by reference (make_pair makes copy)
+ return base_class::insert( std::make_pair( key_type( key ), mapped_type()));
+ }
+
+ /// Inserts new node
+ /**
+ The function creates a node with copy of \p val value
+ and then inserts the node created into the map.
+
+ Preconditions:
+ - The \ref key_type should be constructible from \p key of type \p K.
+ - The \ref mapped_type should be constructible from \p val of type \p V.
+
+ Returns an iterator pointed to inserted value, or \p end() if inserting is failed
+ */
+ template <typename K, typename V>
+ iterator insert( K const& key, V const& val )
+ {
+ //TODO: pass arguments by reference (make_pair makes copy)
+ return base_class::insert( std::make_pair( key_type( key ), mapped_type( val )));
+ }
+
+ /// Inserts new node and initialize it by a functor
+ /**
+ This function inserts new node with key \p key and if inserting is successful then it calls
+ \p func functor with signature
+ \code
+ struct functor {
+ void operator()( value_type& item );
+ };
+ \endcode
+
+ The argument \p item of user-defined functor \p func is the reference
+ to the map's item inserted. <tt>item.second</tt> is a reference to item's value that may be changed.
+ User-defined functor \p func should guarantee that during changing item's value no any other changes
+ could be made on this map's item by concurrent threads.
+
+ The key_type should be constructible from value of type \p K.
+
+ The function allows to split creating of new item into three part:
+ - create item from \p key;
+ - insert new item into the map;
+ - if inserting is successful, initialize the value of item by calling \p f functor
+
+ This can be useful if complete initialization of object of \p mapped_type is heavyweight and
+ it is preferable that the initialization should be completed only if inserting is successful.
+
+ Returns an iterator pointed to inserted value, or \p end() if inserting is failed
+ */
+ template <typename K, typename Func>
+ iterator insert_with( K const& key, Func func )
+ {
+ iterator it = insert( key );
+ if ( it != end())
+ func( (*it));
+ return it;
+ }
+
+ /// For key \p key inserts data of type \p mapped_type created in-place from \p args
+ /**
+ \p key_type should be constructible from type \p K
+
+ Returns \p true if inserting successful, \p false otherwise.
+ */
+ template <typename K, typename... Args>
+ iterator emplace( K&& key, Args&&... args )
+ {
+ return base_class::emplace( key_type( std::forward<K>( key )), mapped_type( std::forward<Args>(args)... ));
+ }
+
+ /// UPdates data by \p key
+ /**
+ The operation inserts new item if \p key is not found in the map and \p bInsert is \p true.
+ Otherwise, if \p key is found, the function returns an iterator that points to item found.
+
+ Returns <tt> std::pair<iterator, bool> </tt> where \p first is an iterator pointing to
+ item found or inserted or \p end() if \p key is not found and insertion is not allowed (\p bInsert is \p false),
+ \p second is \p true if new item has been added or \p false if the item already exists.
+ */
+ template <typename K>
+ std::pair<iterator, bool> update( K const& key, bool bInsert = true )
+ {
+ //TODO: pass arguments by reference (make_pair makes copy)
+ return base_class::update( std::make_pair( key_type( key ), mapped_type()), bInsert );
+ }
+ //@cond
+ template <typename K>
+ CDS_DEPRECATED("ensure() is deprecated, use update()")
+ std::pair<iterator, bool> ensure( K const& key )
+ {
+ return update( key, true );
+ }
+ //@endcond
+
+ /// Checks whether the map contains \p key
+ /**
+ The function searches the item with key equal to \p key
+ and returns an iterator pointed to item found if the key is found,
+ and \ref end() otherwise
+ */
+ template <typename K>
+ iterator contains( K const& key )
+ {
+ return base_class::contains( key );
+ }
+ //@cond
+
+ template <typename K>
+ CDS_DEPRECATED("deprecated, use contains()")
+ iterator find( K const& key )
+ {
+ return contains( key );
+ }
+ //@endcond
+
+ /// Checks whether the map contains \p key using \p pred predicate for searching
+ /**
+ The function is similar to <tt>contains( key )</tt> but \p pred is used for key comparing.
+ \p Less functor has the interface like \p std::less.
+ \p Less must imply the same element order as the comparator used for building the map.
+ */
+ template <typename K, typename Less>
+ iterator contains( K const& key, Less pred ) const
+ {
+ return base_class::contains( key, pred );
+ }
+ //@cond
+ template <typename K, typename Less>
+ CDS_DEPRECATED("deprecated, use contains()")
+ iterator find_with( K const& key, Less pred ) const
+ {
+ return contains( key, pred );
+ }
+ //@endcond
+
+ /// Gets minimum key from the map
+ /**
+ If the map is empty the function returns \p nullptr
+ */
+ value_type * get_min() const
+ {
+ return base_class::get_min();
+ }
+
+ /// Gets maximum key from the map
+ /**
+ The function returns \p nullptr if the map is empty
+ */
+ value_type * get_max() const
+ {
+ return base_class::get_max();
+ }
+
+ /// Clears the map (not atomic)
+ /**
+ Finding and/or inserting is prohibited while clearing.
+ Otherwise an unpredictable result may be encountered.
+ Thus, \p clear() may be used only for debugging purposes.
+ */
+ void clear()
+ {
+ base_class::clear();
+ }
+
+ /// Checks if the map is empty
+ /**
+ Emptiness is checked by item counting: if item count is zero then the map is empty.
+ Thus, the correct item counting feature is an important part of Michael's map implementation.
+ */
+ bool empty() const
+ {
+ return base_class::empty();
+ }
+
+ /// Returns item count in the map
+ size_t size() const
+ {
+ return base_class::size();
+ }
+
+ /// Returns maximum height of skip-list. The max height is a constant for each object and does not exceed 32.
+ static constexpr unsigned int max_height() noexcept
+ {
+ return base_class::max_height();
+ }
+
+ /// Returns const reference to internal statistics
+ stat const& statistics() const
+ {
+ return base_class::statistics();
+ }
+ };
+
+}} // namespace cds::container
+
+
+#endif // #ifndef CDSLIB_CONTAINER_SKIP_LIST_MAP_NOGC_H
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