-//$$CDS-header$$
+/*
+ This file is a part of libcds - Concurrent Data Structures library
-#ifndef __CDS_CONTAINER_SPLIT_LIST_MAP_H
-#define __CDS_CONTAINER_SPLIT_LIST_MAP_H
+ (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_SPLIT_LIST_MAP_H
+#define CDSLIB_CONTAINER_SPLIT_LIST_MAP_H
#include <cds/container/split_list_set.h>
#include <cds/details/binary_functor_wrapper.h>
See intrusive::SplitListSet for a brief description of the split-list algorithm.
Template parameters:
- - \p GC - Garbage collector used
+ - \p GC - Garbage collector used like \p cds::gc::HP or \p cds::gc::DHP
- \p Key - key type of an item stored in the map. It should be copy-constructible
- \p Value - value type stored in the map
- \p Traits - map traits, default is \p split_list::traits. Instead of declaring \p %split_list::traits -based
You should decide what garbage collector you want, and what ordered list you want to use. Split-ordered list
is original data structure based on an ordered list. Suppose, you want construct split-list map based on \p gc::HP GC
and \p MichaelList as ordered list implementation. Your map should map \p int key to \p std::string value.
- So, you beginning your program with following include:
+ So, you beginning your code with the following:
\code
#include <cds/container/michael_list_hp.h>
#include <cds/container/split_list_map.h>
Now you are ready to declare our map class based on \p %SplitListMap:
\code
- typedef cc::SplitListMap< cds::gc::PTB, int, std::string, foo_set_traits > int_string_map;
+ typedef cc::SplitListMap< cds::gc::DHP, int, std::string, foo_set_traits > int_string_map;
\endcode
You may use the modern option-based declaration instead of classic type-traits-based one:
\code
- typedef cc:SplitListMap<
- cs::gc::PTB // GC used
+ typedef cc::SplitListMap<
+ cs::gc::DHP // GC used
,int // key type
,std::string // value type
,cc::split_list::make_traits< // metafunction to build split-list traits
typedef GC gc; ///< Garbage collector
typedef Key key_type; ///< key type
typedef Value mapped_type; ///< type of value to be stored in the map
- typedef Traits options; ///< Map traits
+ typedef Traits traits; ///< Map traits
typedef std::pair<key_type const, mapped_type> value_type ; ///< key-value pair type
typedef typename base_class::ordered_list ordered_list; ///< Underlying ordered list class
typedef typename base_class::hash hash; ///< Hash functor for \ref key_type
typedef typename base_class::item_counter item_counter; ///< Item counter type
+ typedef typename base_class::stat stat; ///< Internal statistics
+
+ /// Count of hazard pointer required
+ static CDS_CONSTEXPR const size_t c_nHazardPtrCount = base_class::c_nHazardPtrCount;
protected:
//@cond
public:
/// Guarded pointer
- typedef cds::gc::guarded_ptr< gc, node_type, value_type, details::guarded_ptr_cast_set<node_type, value_type> > guarded_ptr;
+ typedef typename gc::template guarded_ptr< node_type, value_type, details::guarded_ptr_cast_set<node_type, value_type> > guarded_ptr;
public:
- /// Forward iterator (see \p SplitListSet::iterator)
+ ///@name Forward iterators (only for debugging purpose)
+ //@{
+ /// Forward iterator
/**
- Remember, the iterator <tt>operator -> </tt> and <tt>operator *</tt> returns \ref value_type pointer and reference.
- To access item key and value use <tt>it->first</tt> and <tt>it->second</tt> respectively.
+ The forward iterator for a split-list has the following features:
+ - it has no post-increment operator
+ - it depends on underlying ordered list iterator
+ - The iterator object cannot be moved across thread boundary because it contains GC's guard that is thread-private GC data.
+ - Iterator ensures thread-safety even if you delete the item that iterator points to. However, in case of concurrent
+ deleting operations it is no guarantee that you iterate all item in the split-list.
+ Moreover, a crash is possible when you try to iterate the next element that has been deleted by concurrent thread.
+
+ @warning Use this iterator on the concurrent container for debugging purpose only.
+
+ The iterator interface:
+ \code
+ class iterator {
+ public:
+ // Default constructor
+ iterator();
+
+ // Copy construtor
+ iterator( iterator const& src );
+
+ // Dereference operator
+ value_type * operator ->() const;
+
+ // Dereference operator
+ value_type& operator *() const;
+
+ // Preincrement operator
+ iterator& operator ++();
+
+ // Assignment operator
+ iterator& operator = (iterator const& src);
+
+ // Equality operators
+ bool operator ==(iterator const& i ) const;
+ bool operator !=(iterator const& i ) const;
+ };
+ \endcode
*/
typedef typename base_class::iterator iterator;
- /// Const forward iterator (see SplitListSet::const_iterator)
+ /// Const forward iterator
typedef typename base_class::const_iterator const_iterator;
/// Returns a forward iterator addressing the first element in a map
}
/// Returns a forward const iterator addressing the first element in a map
- //@{
const_iterator begin() const
{
return base_class::begin();
}
- const_iterator cbegin()
+
+ /// 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();
}
- const_iterator cend()
+
+ /// Returns an const iterator that addresses the location succeeding the last element in a map
+ const_iterator cend() const
{
return base_class::cend();
}
- //@}
+ //@}
public:
/// Initializes split-ordered map of default capacity
Returns \p true if inserting successful, \p false otherwise.
*/
template <typename K>
- bool insert( K const& key )
+ bool insert( K&& key )
{
- //TODO: pass arguments by reference (make_pair makes copy)
- return base_class::insert( std::make_pair( key, mapped_type() ) );
+ return base_class::emplace( key_type( std::forward<K>( key )), mapped_type());
}
/// Inserts new node
Returns \p true if \p val is inserted into the map, \p false otherwise.
*/
template <typename K, typename V>
- bool insert( K const& key, V const& val )
+ bool insert( K&& key, V&& val )
{
- //TODO: pass arguments by reference (make_pair makes copy)
- return base_class::insert( std::make_pair(key, val) );
+ return base_class::emplace( key_type( std::forward<K>( key )), mapped_type( std::forward<V>( val )));
}
/// Inserts new node and initialize it by a 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.
- @warning For \ref cds_intrusive_MichaelKVList_hp "MichaelKVList" as the bucket see \ref cds_intrusive_item_creating "insert item troubleshooting".
- \ref cds_intrusive_LazyKVList_hp "LazyKVList" provides exclusive access to inserted item and does not require any node-level
+ @warning For \ref cds_nonintrusive_MichaelKVList_gc "MichaelKVList" as the bucket see \ref cds_intrusive_item_creating "insert item troubleshooting".
+ \ref cds_nonintrusive_LazyKVList_gc "LazyKVList" provides exclusive access to inserted item and does not require any node-level
synchronization.
*/
template <typename K, typename Func>
- bool insert_key( K const& key, Func func )
+ bool insert_with( K&& key, Func func )
{
//TODO: pass arguments by reference (make_pair makes copy)
- return base_class::insert( std::make_pair( key, mapped_type() ), func );
+ return base_class::insert( std::make_pair( key_type( std::forward<K>( key )), mapped_type()), func );
}
/// For key \p key inserts data of type \p mapped_type created from \p args
template <typename K, typename... Args>
bool emplace( K&& key, Args&&... args )
{
- return base_class::emplace( std::forward<K>(key), std::move(mapped_type(std::forward<Args>(args)...)));
+ return base_class::emplace( key_type( std::forward<K>(key)), mapped_type( std::forward<Args>(args)...));
}
- /// Ensures that the \p key exists in the map
+ /// Updates the node
/**
The operation performs inserting or changing data with lock-free manner.
- If the \p key not found in the map, then the new item created from \p key
- is inserted into the map (note that in this case the \ref key_type should be
- constructible from type \p K).
+ If \p key is not found in the map, then \p key is inserted iff \p bAllowInsert is \p true.
Otherwise, the functor \p func is called with item found.
- The functor \p Func may be a function with signature:
- \code
- void func( bool bNew, value_type& item );
- \endcode
- or a functor:
+
+ The functor \p func signature depends on ordered list:
+
+ <b>for \p MichaelKVList, \p LazyKVList</b>
\code
struct my_functor {
void operator()( bool bNew, value_type& item );
};
\endcode
-
with arguments:
- \p bNew - \p true if the item has been inserted, \p false otherwise
- - \p item - item of the list
+ - \p item - the item found or inserted
+
+ The functor may change any fields of the \p item.second that is \p mapped_type.
- Returns <tt> std::pair<bool, bool> </tt> where \p first is true if operation is successfull,
+ <b>for \p IterableKVList</b>
+ \code
+ void func( value_type& val, value_type * old );
+ \endcode
+ where
+ - \p val - a new data constructed from \p key
+ - \p old - old value that will be retired. If new item has been inserted then \p old is \p nullptr.
+
+ Returns <tt> std::pair<bool, bool> </tt> where \p first is true if operation is successful,
\p second is true if new item has been added or \p false if the item with \p key
- already is in the list.
+ already is in the map.
- @warning For \ref cds_intrusive_MichaelKVList_hp "MichaelKVList" as the bucket see \ref cds_intrusive_item_creating "insert item troubleshooting".
- \ref cds_intrusive_LazyKVList_hp "LazyKVList" provides exclusive access to inserted item and does not require any node-level
+ @warning For \ref cds_nonintrusive_MichaelKVList_gc "MichaelKVList" and \ref cds_nonintrusive_IterableKVList_gc "IterableKVList"
+ as the ordered list see \ref cds_intrusive_item_creating "insert item troubleshooting".
+ \ref cds_nonintrusive_LazyKVList_gc "LazyKVList" provides exclusive access to inserted item and does not require any node-level
synchronization.
*/
template <typename K, typename Func>
- std::pair<bool, bool> ensure( K const& key, Func func )
+#ifdef CDS_DOXYGE_INVOKED
+ std::pair<bool, bool>
+#else
+ typename std::enable_if<
+ std::is_same<K,K>::value && !is_iterable_list< ordered_list >::value,
+ std::pair<bool, bool>
+ >::type
+#endif
+ update( K&& key, Func func, bool bAllowInsert = true )
{
- //TODO: pass arguments by reference (make_pair makes copy)
- return base_class::ensure( std::make_pair( key, mapped_type() ),
- [&func](bool bNew, value_type& item, value_type const& /*val*/) {
+ typedef decltype( std::make_pair( key_type( std::forward<K>( key )), mapped_type())) arg_pair_type;
+
+ return base_class::update( std::make_pair( key_type( key ), mapped_type()),
+ [&func]( bool bNew, value_type& item, arg_pair_type const& /*val*/ ) {
func( bNew, item );
- } );
+ },
+ bAllowInsert );
+ }
+ //@cond
+ template <typename K, typename Func>
+#ifdef CDS_DOXYGE_INVOKED
+ std::pair<bool, bool>
+#else
+ typename std::enable_if<
+ std::is_same<K, K>::value && is_iterable_list< ordered_list >::value,
+ std::pair<bool, bool>
+ >::type
+#endif
+ update( K&& key, Func func, bool bAllowInsert = true )
+ {
+ return base_class::update( std::make_pair( key_type( std::forward<K>( key )), mapped_type()), func, bAllowInsert );
+ }
+ //@endcond
+ //@cond
+ template <typename K, typename Func>
+ CDS_DEPRECATED("ensure() is deprecated, use update()")
+ std::pair<bool, bool> ensure( K const& key, Func func )
+ {
+ return update( key, func, true );
+ }
+ //@endcond
+
+ /// Inserts or updates the node (only for \p IterableKVList)
+ /**
+ The operation performs inserting or changing data with lock-free manner.
+
+ If \p key is not found in the map, then \p key is inserted iff \p bAllowInsert is \p true.
+ Otherwise, the current element is changed to \p val, the old element will be retired later.
+
+ Returns std::pair<bool, bool> where \p first is \p true if operation is successful,
+ \p second is \p true if \p val has been added or \p false if the item with that key
+ already in the map.
+ */
+ template <typename Q, typename V>
+#ifdef CDS_DOXYGEN_INVOKED
+ std::pair<bool, bool>
+#else
+ typename std::enable_if<
+ std::is_same< Q, Q>::value && is_iterable_list< ordered_list >::value,
+ std::pair<bool, bool>
+ >::type
+#endif
+ upsert( Q&& key, V&& val, bool bAllowInsert = true )
+ {
+ return base_class::upsert( std::make_pair( key_type( std::forward<Q>( key )), mapped_type( std::forward<V>( val ))), bAllowInsert );
}
+
/// Deletes \p key from the map
/** \anchor cds_nonintrusive_SplitListMap_erase_val
template <typename K, typename Less>
bool erase_with( K const& key, Less pred )
{
- return base_class::erase_with( key, cds::details::predicate_wrapper<value_type, Less, key_accessor>() );
+ CDS_UNUSED( pred );
+ return base_class::erase_with( key, cds::details::predicate_wrapper<value_type, Less, key_accessor>());
}
/// Deletes \p key from the map
void operator()(value_type& item) { ... }
};
\endcode
- The functor may be passed by reference using <tt>boost:ref</tt>
Return \p true if key is found and deleted, \p false otherwise
*/
template <typename K, typename Less, typename Func>
bool erase_with( K const& key, Less pred, Func f )
{
+ CDS_UNUSED( pred );
return base_class::erase_with( key, cds::details::predicate_wrapper<value_type, Less, key_accessor>(), f );
}
+ /// Deletes the item pointed by iterator \p iter (only for \p IterableList based map)
+ /**
+ Returns \p true if the operation is successful, \p false otherwise.
+ The function can return \p false if the node the iterator points to has already been deleted
+ by other thread.
+
+ The function does not invalidate the iterator, it remains valid and can be used for further traversing.
+
+ @note \p %erase_at() is supported only for \p %SplitListMap based on \p IterableList.
+ */
+#ifdef CDS_DOXYGEN_INVOKED
+ bool erase_at( iterator const& iter )
+#else
+ template <typename Iterator>
+ typename std::enable_if< std::is_same<Iterator, iterator>::value && is_iterable_list< ordered_list >::value, bool >::type
+ erase_at( Iterator const& iter )
+#endif
+ {
+ return base_class::erase_at( iter );
+ }
+
/// Extracts the item with specified \p key
/** \anchor cds_nonintrusive_SplitListMap_hp_extract
The function searches an item with key equal to \p key,
- unlinks it from the map, and returns it in \p dest parameter.
- If the item with key equal to \p key is not found the function returns \p false.
+ unlinks it from the map, and returns it as \p guarded_ptr.
+ If \p key is not found the function returns an empty guarded pointer.
Note the compare functor should accept a parameter of type \p K that may be not the same as \p value_type.
- The extracted item is freed automatically when returned \ref guarded_ptr object will be destroyed or released.
+ The extracted item is freed automatically when returned \p guarded_ptr object will be destroyed or released.
@note Each \p guarded_ptr object uses the GC's guard that can be limited resource.
Usage:
splitlist_map theMap;
// ...
{
- splitlist_map::guarded_ptr gp;
- theMap.extract( gp, 5 );
- // Deal with gp
- // ...
-
+ splitlist_map::guarded_ptr gp(theMap.extract( 5 ));
+ if ( gp ) {
+ // Deal with gp
+ // ...
+ }
// Destructor of gp releases internal HP guard
}
\endcode
*/
template <typename K>
- bool extract( guarded_ptr& dest, K const& key )
+ guarded_ptr extract( K const& key )
{
- return base_class::extract_( dest.guard(), key );
+ return base_class::extract_( key );
}
/// Extracts the item using compare functor \p pred
/**
- The function is an analog of \ref cds_nonintrusive_SplitListMap_hp_extract "extract(guarded_ptr&, K const&)"
+ The function is an analog of \ref cds_nonintrusive_SplitListMap_hp_extract "extract(K const&)"
but \p pred predicate is used for key comparing.
\p Less functor has the semantics like \p std::less but should take arguments of type \ref value_type and \p K
\p pred must imply the same element order as the comparator used for building the map.
*/
template <typename K, typename Less>
- bool extract_with( guarded_ptr& dest, K const& key, Less pred )
+ guarded_ptr extract_with( K const& key, Less pred )
{
- return base_class::extract_with_( dest.guard(), key, cds::details::predicate_wrapper<value_type, Less, key_accessor>() );
+ CDS_UNUSED( pred );
+ return base_class::extract_with_( key, cds::details::predicate_wrapper<value_type, Less, key_accessor>());
}
/// Finds the key \p key
return base_class::find( key, [&f](value_type& pair, K const&){ f( pair ); } );
}
+ /// Finds \p key and returns iterator pointed to the item found (only for \p IterableList)
+ /**
+ If \p key is not found the function returns \p end().
+
+ @note This function is supported only for map based on \p IterableList
+ */
+ template <typename K>
+#ifdef CDS_DOXYGEN_INVOKED
+ iterator
+#else
+ typename std::enable_if< std::is_same<K,K>::value && is_iterable_list<ordered_list>::value, iterator >::type
+#endif
+ find( K const& key )
+ {
+ return base_class::find( key );
+ }
+
/// Finds the key \p val using \p pred predicate for searching
/**
The function is an analog of \ref cds_nonintrusive_SplitListMap_find_cfunc "find(K const&, Func)"
template <typename K, typename Less, typename Func>
bool find_with( K const& key, Less pred, Func f )
{
+ CDS_UNUSED( pred );
return base_class::find_with( key,
cds::details::predicate_wrapper<value_type, Less, key_accessor>(),
[&f](value_type& pair, K const&){ f( pair ); } );
}
- /// Finds the key \p key
- /** \anchor cds_nonintrusive_SplitListMap_find_val
+ /// Finds \p key using \p pred predicate and returns iterator pointed to the item found (only for \p IterableList)
+ /**
+ The function is an analog of \p find(K&) but \p pred is used for key comparing.
+ \p Less functor has interface like \p std::less.
+ \p pred must imply the same element order as the comparator used for building the map.
+
+ If \p key is not found the function returns \p end().
+
+ @note This function is supported only for map based on \p IterableList
+ */
+ template <typename K, typename Less>
+#ifdef CDS_DOXYGEN_INVOKED
+ iterator
+#else
+ typename std::enable_if< std::is_same<K, K>::value && is_iterable_list< ordered_list >::value, iterator >::type
+#endif
+ find_with( K const& key, Less pred )
+ {
+ CDS_UNUSED( pred );
+ return base_class::find_with( key, cds::details::predicate_wrapper<value_type, Less, key_accessor>());
+ }
+ /// Checks whether the map contains \p key
+ /**
The function searches the item with key equal to \p key
and returns \p true if it is found, and \p false otherwise.
+
+ Note the hash functor specified for class \p Traits template parameter
+ should accept a parameter of type \p Q that can be not the same as \p value_type.
+ Otherwise, you may use \p contains( Q const&, Less pred ) functions with explicit predicate for key comparing.
*/
template <typename K>
- bool find( K const& key )
+ bool contains( K const& key )
{
- return base_class::find( key );
+ return base_class::contains( key );
}
- /// Finds the key \p val using \p pred predicate for searching
+ /// Checks whether the map contains \p key using \p pred predicate for searching
/**
- The function is an analog of \ref cds_nonintrusive_SplitListMap_find_val "find(K const&)"
- but \p pred is used for key comparing.
+ 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>
- bool find_with( K const& key, Less pred )
+ bool contains( K const& key, Less pred )
{
- return base_class::find( key, cds::details::predicate_wrapper<value_type, Less, key_accessor>() );
+ CDS_UNUSED( pred );
+ return base_class::contains( key, cds::details::predicate_wrapper<value_type, Less, key_accessor>());
}
/// Finds \p key and return the item found
/** \anchor cds_nonintrusive_SplitListMap_hp_get
The function searches the item with key equal to \p key
- and assigns the item found to guarded pointer \p ptr.
- The function returns \p true if \p key is found, and \p false otherwise.
- If \p key is not found the \p ptr parameter is not changed.
+ and returns the item found as a guarded pointer.
+ If \p key is not found the function returns an empty guarded pointer.
@note Each \p guarded_ptr object uses one GC's guard which can be limited resource.
splitlist_map theMap;
// ...
{
- splitlist_map::guarded_ptr gp;
- if ( theMap.get( gp, 5 )) {
+ splitlist_map::guarded_ptr gp(theMap.get( 5 ));
+ if ( gp ) {
// Deal with gp
//...
}
should accept a parameter of type \p K that can be not the same as \p value_type.
*/
template <typename K>
- bool get( guarded_ptr& ptr, K const& key )
+ guarded_ptr get( K const& key )
{
- return base_class::get_( ptr.guard(), key );
+ return base_class::get_( key );
}
/// Finds \p key and return the item found
/**
- The function is an analog of \ref cds_nonintrusive_SplitListMap_hp_get "get( guarded_ptr&, K const&)"
+ The function is an analog of \ref cds_nonintrusive_SplitListMap_hp_get "get( K const&)"
but \p pred is used for comparing the keys.
\p Less functor has the semantics like \p std::less but should take arguments of type \ref value_type and \p K
\p pred must imply the same element order as the comparator used for building the map.
*/
template <typename K, typename Less>
- bool get_with( guarded_ptr& ptr, K const& key, Less pred )
+ guarded_ptr get_with( K const& key, Less pred )
{
- return base_class::get_with_( ptr.guard(), key, cds::details::predicate_wrapper<value_type, Less, key_accessor>() );
+ CDS_UNUSED( pred );
+ return base_class::get_with_( key, cds::details::predicate_wrapper<value_type, Less, key_accessor>());
}
/// Clears the map (not atomic)
{
return base_class::size();
}
- };
+ /// Returns internal statistics
+ stat const& statistics() const
+ {
+ return base_class::statistics();
+ }
+
+ /// Returns internal statistics for \p ordered_list
+ typename ordered_list::stat const& list_statistics() const
+ {
+ return base_class::list_statistics();
+ }
+ };
}} // namespace cds::container
-#endif // #ifndef __CDS_CONTAINER_SPLIT_LIST_MAP_H
+#endif // #ifndef CDSLIB_CONTAINER_SPLIT_LIST_MAP_H