--- /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_IMPL_LAZY_LIST_H
+#define CDSLIB_CONTAINER_IMPL_LAZY_LIST_H
+
+#include <memory>
+#include <cds/container/details/guarded_ptr_cast.h>
+
+namespace cds { namespace container {
+
+ /// Lazy ordered list
+ /** @ingroup cds_nonintrusive_list
+ @anchor cds_nonintrusive_LazyList_gc
+
+ Usually, ordered single-linked list is used as a building block for the hash table implementation.
+ The complexity of searching is <tt>O(N)</tt>.
+
+ Source:
+ - [2005] Steve Heller, Maurice Herlihy, Victor Luchangco, Mark Moir, William N. Scherer III, and Nir Shavit
+ "A Lazy Concurrent List-Based Set Algorithm"
+
+ The lazy list is based on an optimistic locking scheme for inserts and removes,
+ eliminating the need to use the equivalent of an atomically markable
+ reference. It also has a novel wait-free membership \p find() operation
+ that does not need to perform cleanup operations and is more efficient.
+
+ It is non-intrusive version of \p cds::intrusive::LazyList class.
+
+ Template arguments:
+ - \p GC - garbage collector: \p gc::HP, \p gp::DHP
+ - \p T - type to be stored in the list.
+ - \p Traits - type traits, default is \p lazy_list::traits.
+ It is possible to declare option-based list with \p lazy_list::make_traits metafunction istead of \p Traits template
+ argument. For example, the following traits-based declaration of \p gc::HP lazy list
+ \code
+ #include <cds/container/lazy_list_hp.h>
+ // Declare comparator for the item
+ struct my_compare {
+ int operator ()( int i1, int i2 )
+ {
+ return i1 - i2;
+ }
+ };
+
+ // Declare traits
+ struct my_traits: public cds::container::lazy_list::traits
+ {
+ typedef my_compare compare;
+ };
+
+ // Declare traits-based list
+ typedef cds::container::LazyList< cds::gc::HP, int, my_traits > traits_based_list;
+ \endcode
+ is equal to the following option-based list:
+ \code
+ #include <cds/container/lazy_list_hp.h>
+
+ // my_compare is the same
+
+ // Declare option-based list
+ typedef cds::container::LazyList< cds::gc::HP, int,
+ typename cds::container::lazy_list::make_traits<
+ cds::container::opt::compare< my_compare > // item comparator option
+ >::type
+ > option_based_list;
+ \endcode
+
+ Unlike standard container, this implementation does not divide type \p T into key and value part and
+ may be used as main building block for hash set algorithms.
+
+ The key is a function (or a part) of type \p T, and the comparing function is specified by \p Traits::compare functor
+ or \p Traits::less predicate.
+
+ \p LazyKVList is a key-value version of lazy non-intrusive list that is closer to the C++ std library approach.
+
+ \par Usage
+ There are different specializations of this template for each garbage collecting schema used.
+ You should include appropriate .h-file depending on GC you are using:
+ - for gc::HP: <tt> <cds/container/lazy_list_hp.h> </tt>
+ - for gc::DHP: <tt> <cds/container/lazy_list_dhp.h> </tt>
+ - for \ref cds_urcu_desc "RCU": <tt> <cds/container/lazy_list_rcu.h> </tt>
+ - for gc::nogc: <tt> <cds/container/lazy_list_nogc.h> </tt>
+ */
+ template <
+ typename GC,
+ typename T,
+#ifdef CDS_DOXYGEN_INVOKED
+ typename Traits = lazy_list::traits
+#else
+ typename Traits
+#endif
+ >
+ class LazyList:
+#ifdef CDS_DOXYGEN_INVOKED
+ protected intrusive::LazyList< GC, T, Traits >
+#else
+ protected details::make_lazy_list< GC, T, Traits >::type
+#endif
+ {
+ //@cond
+ typedef details::make_lazy_list< GC, T, Traits > maker;
+ typedef typename maker::type base_class;
+ //@endcond
+
+ public:
+ typedef GC gc; ///< Garbage collector used
+ typedef T value_type; ///< Type of value stored in the list
+ typedef Traits traits; ///< List traits
+
+ typedef typename base_class::back_off back_off; ///< Back-off strategy used
+ typedef typename maker::allocator_type allocator_type; ///< Allocator type used for allocate/deallocate the nodes
+ typedef typename base_class::item_counter item_counter; ///< Item counting policy used
+ typedef typename maker::key_comparator key_comparator; ///< key comparison functor
+ typedef typename base_class::memory_model memory_model; ///< Memory ordering. See cds::opt::memory_model option
+ typedef typename base_class::stat stat; ///< Internal statistics
+
+ static constexpr const size_t c_nHazardPtrCount = base_class::c_nHazardPtrCount; ///< Count of hazard pointer required for the algorithm
+
+ //@cond
+ // Rebind traits (split-list support)
+ template <typename... Options>
+ struct rebind_traits {
+ typedef LazyList<
+ gc
+ , value_type
+ , typename cds::opt::make_options< traits, Options...>::type
+ > type;
+ };
+
+ // Stat selector
+ template <typename Stat>
+ using select_stat_wrapper = typename base_class::template select_stat_wrapper< Stat >;
+ //@endcond
+
+ protected:
+ //@cond
+ typedef typename base_class::value_type node_type;
+ typedef typename maker::cxx_allocator cxx_allocator;
+ typedef typename maker::node_deallocator node_deallocator;
+ typedef typename maker::intrusive_traits::compare intrusive_key_comparator;
+
+ typedef typename base_class::node_type head_type;
+
+ struct node_disposer {
+ void operator()( node_type * pNode )
+ {
+ free_node( pNode );
+ }
+ };
+ typedef std::unique_ptr< node_type, node_disposer > scoped_node_ptr;
+
+ //@endcond
+
+ public:
+ /// Guarded pointer
+ typedef typename gc::template guarded_ptr< node_type, value_type, details::guarded_ptr_cast_set<node_type, value_type> > guarded_ptr;
+
+ protected:
+ //@cond
+ template <bool IsConst>
+ class iterator_type: protected base_class::template iterator_type<IsConst>
+ {
+ typedef typename base_class::template iterator_type<IsConst> iterator_base;
+
+ iterator_type( head_type const& pNode )
+ : iterator_base( const_cast<head_type *>( &pNode ))
+ {}
+
+ iterator_type( head_type const * pNode )
+ : iterator_base( const_cast<head_type *>( pNode ))
+ {}
+
+ friend class LazyList;
+
+ public:
+ typedef typename cds::details::make_const_type<value_type, IsConst>::pointer value_ptr;
+ typedef typename cds::details::make_const_type<value_type, IsConst>::reference value_ref;
+
+ iterator_type()
+ {}
+
+ iterator_type( iterator_type const& src )
+ : iterator_base( src )
+ {}
+
+ value_ptr operator ->() const
+ {
+ typename iterator_base::value_ptr p = iterator_base::operator ->();
+ return p ? &(p->m_Value) : nullptr;
+ }
+
+ value_ref operator *() const
+ {
+ return (iterator_base::operator *()).m_Value;
+ }
+
+ /// Pre-increment
+ iterator_type& operator ++()
+ {
+ iterator_base::operator ++();
+ return *this;
+ }
+
+ template <bool C>
+ bool operator ==(iterator_type<C> const& i ) const
+ {
+ return iterator_base::operator ==(i);
+ }
+ template <bool C>
+ bool operator !=(iterator_type<C> const& i ) const
+ {
+ return iterator_base::operator !=(i);
+ }
+ };
+ //@endcond
+
+ public:
+ ///@name Forward iterators (only for debugging purpose)
+ //@{
+ /// Forward iterator
+ /**
+ The forward iterator for lazy list has some features:
+ - it has no post-increment operator
+ - to protect the value, the iterator contains a GC-specific guard + another guard is required locally for increment operator.
+ For some GC (\p gc::HP), a guard is limited resource per thread, so an exception (or assertion) "no free guard"
+ may be thrown if a limit of guard count per thread is exceeded.
+ - The iterator cannot be moved across thread boundary since 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 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.
+ */
+ typedef iterator_type<false> iterator;
+
+ /// Const forward iterator
+ /**
+ For iterator's features and requirements see \ref iterator
+ */
+ typedef iterator_type<true> const_iterator;
+
+ /// Returns a forward iterator addressing the first element in a list
+ /**
+ For empty list \code begin() == end() \endcode
+ */
+ iterator begin()
+ {
+ iterator it( head());
+ ++it ; // skip dummy head node
+ return it;
+ }
+
+ /// Returns an iterator that addresses the location succeeding the last element in a list
+ /**
+ 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 list.
+ For empty list \code begin() == end() \endcode
+ */
+ iterator end()
+ {
+ return iterator( tail());
+ }
+
+ /// Returns a forward const iterator addressing the first element in a list
+ const_iterator begin() const
+ {
+ const_iterator it( head());
+ ++it ; // skip dummy head node
+ return it;
+ }
+
+ /// Returns a forward const iterator addressing the first element in a list
+ const_iterator cbegin() const
+ {
+ const_iterator it( head());
+ ++it ; // skip dummy head node
+ return it;
+ }
+
+ /// Returns an const iterator that addresses the location succeeding the last element in a list
+ const_iterator end() const
+ {
+ return const_iterator( tail());
+ }
+
+ /// Returns an const iterator that addresses the location succeeding the last element in a list
+ const_iterator cend() const
+ {
+ return const_iterator( tail());
+ }
+ //@}
+
+ public:
+ /// Default constructor
+ LazyList()
+ {}
+
+ //@cond
+ template <typename Stat, typename = std::enable_if<std::is_same<stat, lazy_list::wrapped_stat<Stat>>::value >>
+ explicit LazyList( Stat& st )
+ : base_class( st )
+ {}
+ //@endcond
+
+ /// Destructor clears the list
+ ~LazyList()
+ {
+ clear();
+ }
+
+ /// Inserts new node
+ /**
+ The function creates a node with copy of \p val value
+ and then inserts the node created into the list.
+
+ The type \p Q should contain as minimum the complete key of the node.
+ The object of \ref value_type should be constructible from \p val of type \p Q.
+ In trivial case, \p Q is equal to \ref value_type.
+
+ Returns \p true if inserting successful, \p false otherwise.
+ */
+ template <typename Q>
+ bool insert( Q&& val )
+ {
+ return insert_at( head(), std::forward<Q>( val ));
+ }
+
+ /// Inserts new node
+ /**
+ This function inserts new node with default-constructed value and then it calls
+ \p func functor with signature
+ \code void func( value_type& item ) ;\endcode
+
+ The argument \p item of user-defined functor \p func is the reference
+ to the list's item inserted.
+ When \p func is called it has exclusive access to the item.
+ The user-defined functor is called only if the inserting is success.
+
+ The type \p Q should contain the complete key of the node.
+ The object of \p value_type should be constructible from \p key of type \p Q.
+
+ The function allows to split creating of new item into two part:
+ - create item from \p key with initializing key-fields only;
+ - insert new item into the list;
+ - if inserting is successful, initialize non-key fields of item by calling \p func functor
+
+ This can be useful if complete initialization of object of \p value_type is heavyweight and
+ it is preferable that the initialization should be completed only if inserting is successful.
+ */
+ template <typename Q, typename Func>
+ bool insert( Q&& key, Func func )
+ {
+ return insert_at( head(), std::forward<Q>( key ), func );
+ }
+
+ /// Inserts data of type \p value_type constructed from \p args
+ /**
+ Returns \p true if inserting successful, \p false otherwise.
+ */
+ template <typename... Args>
+ bool emplace( Args&&... args )
+ {
+ return emplace_at( head(), std::forward<Args>(args)... );
+ }
+
+ /// Updates data by \p key
+ /**
+ The operation performs inserting or replacing the element with lock-free manner.
+
+ If the \p key not found in the list, then the new item created from \p key
+ will be inserted iff \p bAllowInsert is \p true.
+ Otherwise, if \p key is found, the functor \p func is called with item found.
+
+ The functor \p Func signature is:
+ \code
+ struct my_functor {
+ void operator()( bool bNew, value_type& item, Q const& key );
+ };
+ \endcode
+
+ with arguments:
+ - \p bNew - \p true if the item has been inserted, \p false otherwise
+ - \p item - item of the list
+ - \p key - argument \p key passed into the \p %update() function
+
+ The functor may change non-key fields of the \p item;
+ during \p func call \p item is locked so it is safe to modify the item in
+ multi-threaded environment.
+
+ 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 exists.
+ */
+ template <typename Q, typename Func>
+ std::pair<bool, bool> update( Q const& key, Func func, bool bAllowInsert = true )
+ {
+ return update_at( head(), key, func, bAllowInsert );
+ }
+ //@cond
+ template <typename Q, typename Func>
+ CDS_DEPRECATED("ensure() is deprecated, use update()")
+ std::pair<bool, bool> ensure( Q const& key, Func f )
+ {
+ return update( key, f, true );
+ }
+ //@endcond
+
+ /// Deletes \p key from the list
+ /** \anchor cds_nonintrusive_LazyList_hp_erase_val
+ Since the key of LazyList's item type \p T is not explicitly specified,
+ template parameter \p Q defines the key type searching in the list.
+ The list item comparator should be able to compare the type \p T of list item
+ and the type \p Q.
+
+ Return \p true if key is found and deleted, \p false otherwise
+ */
+ template <typename Q>
+ bool erase( Q const& key )
+ {
+ return erase_at( head(), key, intrusive_key_comparator(), [](value_type const&){} );
+ }
+
+ /// Deletes the item from the list using \p pred predicate for searching
+ /**
+ The function is an analog of \ref cds_nonintrusive_LazyList_hp_erase_val "erase(Q const&)"
+ but \p pred is used for key comparing.
+ \p Less functor has the interface like \p std::less.
+ \p pred must imply the same element order as the comparator used for building the list.
+ */
+ template <typename Q, typename Less>
+ bool erase_with( Q const& key, Less pred )
+ {
+ CDS_UNUSED( pred );
+ return erase_at( head(), key, typename maker::template less_wrapper<Less>::type(), [](value_type const&){} );
+ }
+
+ /// Deletes \p key from the list
+ /** \anchor cds_nonintrusive_LazyList_hp_erase_func
+ The function searches an item with key \p key, calls \p f functor with item found
+ and deletes the item. If \p key is not found, the functor is not called.
+
+ The functor \p Func interface:
+ \code
+ struct extractor {
+ void operator()(const value_type& val) { ... }
+ };
+ \endcode
+
+ Since the key of LazyList's item type \p T is not explicitly specified,
+ template parameter \p Q defines the key type searching in the list.
+ The list item comparator should be able to compare the type \p T of list item
+ and the type \p Q.
+
+ Return \p true if key is found and deleted, \p false otherwise
+
+ See also: \ref erase
+ */
+ template <typename Q, typename Func>
+ bool erase( Q const& key, Func f )
+ {
+ return erase_at( head(), key, intrusive_key_comparator(), f );
+ }
+
+ /// Deletes the item from the list using \p pred predicate for searching
+ /**
+ The function is an analog of \ref cds_nonintrusive_LazyList_hp_erase_func "erase(Q const&, Func)"
+ but \p pred is used for key comparing.
+ \p Less functor has the interface like \p std::less.
+ \p pred must imply the same element order as the comparator used for building the list.
+ */
+ template <typename Q, typename Less, typename Func>
+ bool erase_with( Q const& key, Less pred, Func f )
+ {
+ CDS_UNUSED( pred );
+ return erase_at( head(), key, typename maker::template less_wrapper<Less>::type(), f );
+ }
+
+ /// Extracts the item from the list with specified \p key
+ /** \anchor cds_nonintrusive_LazyList_hp_extract
+ The function searches an item with key equal to \p key,
+ unlinks it from the list, 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 Q that can be not the same as \p value_type.
+
+ @note Each \p guarded_ptr object uses the GC's guard that can be limited resource.
+
+ Usage:
+ \code
+ typedef cds::container::LazyList< cds::gc::HP, foo, my_traits > ord_list;
+ ord_list theList;
+ // ...
+ {
+ ord_list::guarded_ptr gp(theList.extract( 5 ));
+ if ( gp ) {
+ // Deal with gp
+ // ...
+ }
+ // Destructor of gp releases internal HP guard and frees the item
+ }
+ \endcode
+ */
+ template <typename Q>
+ guarded_ptr extract( Q const& key )
+ {
+ return extract_at( head(), key, intrusive_key_comparator());
+ }
+
+ /// Extracts the item from the list with comparing functor \p pred
+ /**
+ The function is an analog of \ref cds_nonintrusive_LazyList_hp_extract "extract(Q 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 Q
+ in any order.
+ \p pred must imply the same element order as the comparator used for building the list.
+ */
+ template <typename Q, typename Less>
+ guarded_ptr extract_with( Q const& key, Less pred )
+ {
+ CDS_UNUSED( pred );
+ return extract_at( head(), key, typename maker::template less_wrapper<Less>::type());
+ }
+
+ /// Checks whether the list 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.
+ */
+ template <typename Q>
+ bool contains( Q const& key )
+ {
+ return find_at( head(), key, intrusive_key_comparator());
+ }
+ //@cond
+ template <typename Q>
+ CDS_DEPRECATED("deprecated, use contains()")
+ bool find( Q const& key )
+ {
+ return contains( key );
+ }
+ //@endcond
+
+ /// Checks whether the list contains \p key using \p pred predicate for searching
+ /**
+ The function is an analog of <tt>contains( key )</tt> but \p pred is used for key comparing.
+ \p Less functor has the interface like \p std::less.
+ \p pred must imply the same element order as the comparator used for building the list.
+ */
+ template <typename Q, typename Less>
+ bool contains( Q const& key, Less pred )
+ {
+ CDS_UNUSED( pred );
+ return find_at( head(), key, typename maker::template less_wrapper<Less>::type());
+ }
+ //@cond
+ template <typename Q, typename Less>
+ CDS_DEPRECATED("deprecated, use contains()")
+ bool find_with( Q const& key, Less pred )
+ {
+ return contains( key, pred );
+ }
+ //@endcond
+ /// Finds the key \p key and performs an action with it
+ /** \anchor cds_nonintrusive_LazyList_hp_find_func
+ The function searches an item with key equal to \p key and calls the functor \p f for the item found.
+ The interface of \p Func functor is:
+ \code
+ struct functor {
+ void operator()( value_type& item, Q& key );
+ };
+ \endcode
+ where \p item is the item found, \p key is the <tt>find</tt> function argument.
+
+ The functor may change non-key fields of \p item. Note that the function is only guarantee
+ that \p item cannot be deleted during functor is executing.
+ The function does not serialize simultaneous access to the list \p item. If such access is
+ possible you must provide your own synchronization schema to exclude unsafe item modifications.
+
+ The \p key argument is non-const since it can be used as \p f functor destination i.e., the functor
+ may modify both arguments.
+
+ The function returns \p true if \p key is found, \p false otherwise.
+ */
+ template <typename Q, typename Func>
+ bool find( Q& key, Func f )
+ {
+ return find_at( head(), key, intrusive_key_comparator(), f );
+ }
+ //@cond
+ template <typename Q, typename Func>
+ bool find( Q const& key, Func f )
+ {
+ return find_at( head(), key, intrusive_key_comparator(), f );
+ }
+ //@endcond
+
+ /// Finds the key \p key using \p pred predicate for searching
+ /**
+ The function is an analog of \ref cds_nonintrusive_LazyList_hp_find_func "find(Q&, Func)"
+ but \p pred is used for key comparing.
+ \p Less functor has the interface like \p std::less.
+ \p pred must imply the same element order as the comparator used for building the list.
+ */
+ template <typename Q, typename Less, typename Func>
+ bool find_with( Q& key, Less pred, Func f )
+ {
+ CDS_UNUSED( pred );
+ return find_at( head(), key, typename maker::template less_wrapper<Less>::type(), f );
+ }
+ //@cond
+ template <typename Q, typename Less, typename Func>
+ bool find_with( Q const& key, Less pred, Func f )
+ {
+ CDS_UNUSED( pred );
+ return find_at( head(), key, typename maker::template less_wrapper<Less>::type(), f );
+ }
+ //@endcond
+
+ /// Finds the key \p key and return the item found
+ /** \anchor cds_nonintrusive_LazyList_hp_get
+ The function searches the item with key equal to \p key
+ and returns the item found as \p guarded_ptr.
+ 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.
+
+ Usage:
+ \code
+ typedef cds::container::LazyList< cds::gc::HP, foo, my_traits > ord_list;
+ ord_list theList;
+ // ...
+ {
+ ord_list::guarded_ptr gp( theList.get( 5 ));
+ if ( gp ) {
+ // Deal with gp
+ //...
+ }
+ // Destructor of guarded_ptr releases internal HP guard and frees the item
+ }
+ \endcode
+
+ Note the compare 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.
+ */
+ template <typename Q>
+ guarded_ptr get( Q const& key )
+ {
+ return get_at( head(), key, intrusive_key_comparator());
+ }
+
+ /// Finds the key \p key and return the item found
+ /**
+ The function is an analog of \ref cds_nonintrusive_LazyList_hp_get "get( Q 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 Q
+ in any order.
+ \p pred must imply the same element order as the comparator used for building the list.
+ */
+ template <typename Q, typename Less>
+ guarded_ptr get_with( Q const& key, Less pred )
+ {
+ CDS_UNUSED( pred );
+ return get_at( head(), key, typename maker::template less_wrapper<Less>::type());
+ }
+
+ /// Checks whether the list is empty
+ bool empty() const
+ {
+ return base_class::empty();
+ }
+
+ /// Returns list's item count
+ /**
+ The value returned depends on \p Traits::item_counter type. For \p atomicity::empty_item_counter,
+ this function always returns 0.
+
+ @note Even if you use real item counter and it returns 0, this fact is not mean that the list
+ is empty. To check list emptyness use \ref empty() method.
+ */
+ size_t size() const
+ {
+ return base_class::size();
+ }
+
+ /// Returns const reference to internal statistics
+ stat const& statistics() const
+ {
+ return base_class::statistics();
+ }
+
+ /// Clears the list
+ void clear()
+ {
+ base_class::clear();
+ }
+
+ protected:
+ //@cond
+ static value_type& node_to_value( node_type& n )
+ {
+ return n.m_Value;
+ }
+
+ static value_type const& node_to_value( node_type const& n )
+ {
+ return n.m_Value;
+ }
+
+ template <typename Q>
+ static node_type * alloc_node( Q const& v )
+ {
+ return cxx_allocator().New( v );
+ }
+
+ template <typename... Args>
+ static node_type * alloc_node( Args&&... args )
+ {
+ return cxx_allocator().MoveNew( std::forward<Args>( args )... );
+ }
+
+ static void free_node( node_type * pNode )
+ {
+ cxx_allocator().Delete( pNode );
+ }
+
+ head_type& head()
+ {
+ return base_class::m_Head;
+ }
+
+ head_type const& head() const
+ {
+ return base_class::m_Head;
+ }
+
+ head_type& tail()
+ {
+ return base_class::m_Tail;
+ }
+
+ head_type const& tail() const
+ {
+ return base_class::m_Tail;
+ }
+
+ bool insert_node( node_type * pNode )
+ {
+ return insert_node_at( head(), pNode );
+ }
+
+ bool insert_node_at( head_type& refHead, node_type * pNode )
+ {
+ assert( pNode != nullptr );
+ scoped_node_ptr p( pNode );
+
+ if ( base_class::insert_at( &refHead, *pNode )) {
+ p.release();
+ return true;
+ }
+
+ return false;
+ }
+
+ template <typename Q>
+ bool insert_at( head_type& refHead, Q&& val )
+ {
+ return insert_node_at( refHead, alloc_node( std::forward<Q>( val )));
+ }
+
+ template <typename... Args>
+ bool emplace_at( head_type& refHead, Args&&... args )
+ {
+ return insert_node_at( refHead, alloc_node( std::forward<Args>(args)... ));
+ }
+
+ template <typename Q, typename Func>
+ bool insert_at( head_type& refHead, Q&& key, Func f )
+ {
+ scoped_node_ptr pNode( alloc_node( std::forward<Q>( key )));
+
+ if ( base_class::insert_at( &refHead, *pNode, [&f](node_type& node){ f( node_to_value(node)); } )) {
+ pNode.release();
+ return true;
+ }
+ return false;
+ }
+
+ template <typename Q, typename Compare, typename Func>
+ bool erase_at( head_type& refHead, Q const& key, Compare cmp, Func f )
+ {
+ return base_class::erase_at( &refHead, key, cmp, [&f](node_type const& node){ f( node_to_value(node)); } );
+ }
+
+ template <typename Q, typename Compare>
+ guarded_ptr extract_at( head_type& refHead, Q const& key, Compare cmp )
+ {
+ return base_class::extract_at( &refHead, key, cmp );
+ }
+
+ template <typename Q, typename Func>
+ std::pair<bool, bool> update_at( head_type& refHead, Q const& key, Func f, bool bAllowInsert )
+ {
+ scoped_node_ptr pNode( alloc_node( key ));
+
+ std::pair<bool, bool> ret = base_class::update_at( &refHead, *pNode,
+ [&f, &key](bool bNew, node_type& node, node_type&) { f( bNew, node_to_value(node), key );},
+ bAllowInsert );
+ if ( ret.first && ret.second )
+ pNode.release();
+
+ return ret;
+ }
+
+ template <typename Q, typename Compare>
+ bool find_at( head_type& refHead, Q const& key, Compare cmp )
+ {
+ return base_class::find_at( &refHead, key, cmp );
+ }
+
+ template <typename Q, typename Compare, typename Func>
+ bool find_at( head_type& refHead, Q& val, Compare cmp, Func f )
+ {
+ return base_class::find_at( &refHead, val, cmp, [&f](node_type& node, Q& v){ f( node_to_value(node), v ); });
+ }
+
+ template <typename Q, typename Compare>
+ guarded_ptr get_at( head_type& refHead, Q const& key, Compare cmp )
+ {
+ return base_class::get_at( &refHead, key, cmp );
+ }
+
+ //@endcond
+ };
+
+}} // namespace cds::container
+
+#endif // #ifndef CDSLIB_CONTAINER_IMPL_LAZY_LIST_H
projects / c11concurrency-benchmarks.git / blobdiff