-//$$CDS-header$$
+/*
+ This file is a part of libcds - Concurrent Data Structures library
+
+ (C) Copyright Maxim Khizhinsky (libcds.dev@gmail.com) 2006-2016
+
+ 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
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 may use the modern option-based declaration instead of classic type-traits-based one:
\code
- typedef cc:SplitListMap<
+ typedef cc::SplitListMap<
cs::gc::DHP // GC used
,int // key type
,std::string // value type
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::item_counter item_counter; ///< Item counter type
typedef typename base_class::stat stat; ///< Internal statistics
- //@cond
- typedef cds::container::split_list::implementation_tag implementation_tag;
- //@endcond
+ /// Count of hazard pointer required
+ static CDS_CONSTEXPR const size_t c_nHazardPtrCount = base_class::c_nHazardPtrCount;
protected:
//@cond
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();
}
+
+ /// 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:
/// Initializes split-ordered map of default capacity
template <typename K>
bool insert( K const& 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( key ), mapped_type() );
}
/// Inserts new node
template <typename K, typename V>
bool insert( K const& key, V const& 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( key ), mapped_type( val ));
}
/// Inserts new node and initialize it by a functor
bool insert_with( K const& 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( 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 signature is:
\code
struct my_functor {
void operator()( bool bNew, value_type& item );
with arguments:
- \p bNew - \p true if the item has been inserted, \p false otherwise
- - \p item - item of the list
+ - \p item - item of the map
- Returns <tt> std::pair<bool, bool> </tt> where \p first is true if operation is successfull,
+ 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_nonintrusive_MichaelKVList_gc "MichaelKVList" 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 )
+ std::pair<bool, bool> update( K const& 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( 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>
+ CDS_DEPRECATED("ensure() is deprecated, use update()")
+ std::pair<bool, bool> ensure( K const& key, Func func )
+ {
+ return update( key, func, true );
+ }
+ //@endcond
/// Deletes \p key from the map
/** \anchor cds_nonintrusive_SplitListMap_erase_val
bool erase_with( K const& key, Less pred )
{
CDS_UNUSED( pred );
- return base_class::erase_with( key, cds::details::predicate_wrapper<value_type, Less, key_accessor>() );
+ return base_class::erase_with( key, cds::details::predicate_wrapper<value_type, Less, key_accessor>());
}
/// Deletes \p key from the map
template <typename K>
guarded_ptr extract( K const& key )
{
- guarded_ptr gp;
- base_class::extract_( gp.guard(), key );
- return gp;
+ return base_class::extract_( key );
}
/// Extracts the item using compare functor \p pred
guarded_ptr extract_with( K const& key, Less pred )
{
CDS_UNUSED( pred );
- guarded_ptr gp;
- base_class::extract_with_( gp.guard(), key, cds::details::predicate_wrapper<value_type, Less, key_accessor>() );
- return gp;
+ return base_class::extract_with_( key, cds::details::predicate_wrapper<value_type, Less, key_accessor>());
}
/// Finds the key \p key
[&f](value_type& pair, K const&){ f( pair ); } );
}
- /// Finds the key \p key
- /** \anchor cds_nonintrusive_SplitListMap_find_val
-
+ /// 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 contains( K const& key )
+ {
+ return base_class::contains( key );
+ }
+ //@cond
+ template <typename K>
+ CDS_DEPRECATED("deprecated, use contains()")
bool find( K const& key )
{
- return base_class::find( key );
+ return contains( key );
}
+ //@endcond
- /// 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 )
{
CDS_UNUSED( pred );
- return base_class::find( key, cds::details::predicate_wrapper<value_type, Less, key_accessor>() );
+ return base_class::contains( key, cds::details::predicate_wrapper<value_type, Less, key_accessor>());
}
+ //@cond
+ template <typename K, typename Less>
+ CDS_DEPRECATED("deprecated, use contains()")
+ bool find_with( K const& key, Less pred )
+ {
+ return contains( key, pred );
+ }
+ //@endcond
/// Finds \p key and return the item found
/** \anchor cds_nonintrusive_SplitListMap_hp_get
template <typename K>
guarded_ptr get( K const& key )
{
- guarded_ptr gp;
- base_class::get_( gp.guard(), key );
- return gp;
+ return base_class::get_( key );
}
/// Finds \p key and return the item found
guarded_ptr get_with( K const& key, Less pred )
{
CDS_UNUSED( pred );
- guarded_ptr gp;
- base_class::get_with_( gp.guard(), key, cds::details::predicate_wrapper<value_type, Less, key_accessor>() );
- return gp;
+ return base_class::get_with_( key, cds::details::predicate_wrapper<value_type, Less, key_accessor>());
}
/// Clears the map (not atomic)
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