/*
This file is a part of libcds - Concurrent Data Structures library
- (C) Copyright Maxim Khizhinsky (libcds.dev@gmail.com) 2006-2016
+ (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:
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.
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CDSLIB_CONTAINER_MICHAEL_SET_H
#define CDSLIB_CONTAINER_MICHAEL_SET_H
#include <cds/container/details/michael_set_base.h>
+#include <cds/container/details/iterable_list_base.h>
#include <cds/details/allocator.h>
-#include <type_traits> // is_move_constructible
-
namespace cds { namespace container {
/// Michael's hash set
- \p GC - Garbage collector used. You may use any \ref cds_garbage_collector "Garbage collector"
from the \p libcds library.
Note the \p GC must be the same as the \p GC used for \p OrderedList
- - \p OrderedList - ordered list implementation used as bucket for hash set, for example, \p MichaelList.
+ - \p OrderedList - ordered list implementation used as bucket for hash set, possible implementations:
+ \p MichaelList, \p LazyList, \p IterableList.
The ordered list implementation specifies the type \p T to be stored in the hash-set,
the comparing functor for the type \p T and other features specific for the ordered list.
- \p Traits - set traits, default is \p michael_set::traits.
\code
// Our node type
struct Foo {
- std::string key_ ; // key field
+ std::string key_; // key field
// ... other fields
};
};
\endcode
- <b>Iterators</b>
-
- The class supports a forward iterator (\ref iterator and \ref const_iterator).
- The iteration is unordered.
- The iterator object is thread-safe: the element pointed by the iterator object is guarded,
- so, the element cannot be reclaimed while the iterator object is alive.
- However, passing an iterator object between threads is dangerous.
-
- @warning Due to concurrent nature of Michael's set it is not guarantee that you can iterate
- all elements in the set: any concurrent deletion can exclude the element
- pointed by the iterator from the set, and your iteration can be terminated
- before end of the set. Therefore, such iteration is more suitable for debugging purpose only
-
- Remember, each iterator object requires an additional hazard pointer, that may be
- a limited resource for \p GC like \p gc::HP (for \p gc::DHP the total count of
- guards is unlimited).
-
- The iterator class supports the following minimalistic interface:
- \code
- struct iterator {
- // Default ctor
- iterator();
-
- // Copy ctor
- iterator( iterator const& s);
-
- value_type * operator ->() const;
- value_type& operator *() const;
-
- // Pre-increment
- iterator& operator ++();
-
- // Copy assignment
- iterator& operator = (const iterator& src);
-
- bool operator ==(iterator const& i ) const;
- bool operator !=(iterator const& i ) const;
- };
- \endcode
- Note, the iterator object returned by \ref end, \p cend member functions points to \p nullptr and should not be dereferenced.
-
<b>How to use</b>
Suppose, we have the following type \p Foo that we want to store in our \p %MichaelHashSet:
\code
struct Foo {
- int nKey ; // key field
- int nVal ; // value field
+ int nKey; // key field
+ int nVal; // value field
};
\endcode
class MichaelHashSet
{
public:
- typedef GC gc; ///< Garbage collector
- typedef OrderedList bucket_type; ///< type of ordered list used as a bucket implementation
- typedef Traits traits; ///< Set traits
+ typedef GC gc; ///< Garbage collector
+ typedef OrderedList ordered_list; ///< type of ordered list used as a bucket implementation
+ typedef Traits traits; ///< Set traits
- typedef typename bucket_type::value_type value_type; ///< type of value to be stored in the list
- typedef typename bucket_type::key_comparator key_comparator; ///< key comparison functor
+ typedef typename ordered_list::value_type value_type; ///< type of value to be stored in the list
+ typedef typename ordered_list::key_comparator key_comparator; ///< key comparison functor
+#ifdef CDS_DOXYGEN_INVOKED
+ typedef typename ordered_list::stat stat; ///< Internal statistics
+#endif
/// Hash functor for \ref value_type and all its derivatives that you use
typedef typename cds::opt::v::hash_selector< typename traits::hash >::type hash;
typedef typename traits::item_counter item_counter; ///< Item counter type
+ typedef typename traits::allocator allocator; ///< Bucket table allocator
- typedef typename bucket_type::guarded_ptr guarded_ptr; ///< Guarded pointer
- static CDS_CONSTEXPR const size_t c_nHazardPtrCount = bucket_type::c_nHazardPtrCount; ///< Count of hazard pointer required
+ static CDS_CONSTEXPR const size_t c_nHazardPtrCount = ordered_list::c_nHazardPtrCount; ///< Count of hazard pointer required
+
+ // GC and OrderedList::gc must be the same
+ static_assert( std::is_same<gc, typename ordered_list::gc>::value, "GC and OrderedList::gc must be the same");
+
+ // atomicity::empty_item_counter is not allowed as a item counter
+ static_assert( !std::is_same<item_counter, atomicity::empty_item_counter>::value,
+ "cds::atomicity::empty_item_counter is not allowed as a item counter");
- protected:
//@cond
- class internal_bucket_type: public bucket_type
- {
- typedef bucket_type base_class;
- public:
- using base_class::node_type;
- using base_class::alloc_node;
- using base_class::insert_node;
- using base_class::node_to_value;
- };
+ typedef typename ordered_list::template select_stat_wrapper< typename ordered_list::stat > bucket_stat;
+
+ typedef typename ordered_list::template rebind_traits<
+ cds::opt::item_counter< cds::atomicity::empty_item_counter >
+ , cds::opt::stat< typename bucket_stat::wrapped_stat >
+ >::type internal_bucket_type;
/// Bucket table allocator
- typedef cds::details::Allocator< internal_bucket_type, typename traits::allocator > bucket_table_allocator;
- //@endcond
+ typedef typename allocator::template rebind< internal_bucket_type >::other bucket_table_allocator;
- protected:
- //@cond
- item_counter m_ItemCounter; ///< Item counter
- hash m_HashFunctor; ///< Hash functor
- internal_bucket_type * m_Buckets; ///< bucket table
+ typedef typename bucket_stat::stat stat;
//@endcond
- private:
- //@cond
- const size_t m_nHashBitmask;
- //@endcond
+ /// Guarded pointer - a result of \p get() and \p extract() functions
+ typedef typename internal_bucket_type::guarded_ptr guarded_ptr;
protected:
//@cond
- /// Calculates hash value of \p key
- template <typename Q>
- size_t hash_value( Q const& key ) const
- {
- return m_HashFunctor( key ) & m_nHashBitmask;
- }
-
- /// Returns the bucket (ordered list) for \p key
- template <typename Q>
- internal_bucket_type& bucket( Q const& key )
- {
- return m_Buckets[ hash_value( key ) ];
- }
+ size_t const m_nHashBitmask;
+ internal_bucket_type * m_Buckets; ///< bucket table
+ item_counter m_ItemCounter; ///< Item counter
+ hash m_HashFunctor; ///< Hash functor
+ stat m_Stat; ///< Internal statistics
//@endcond
public:
- ///@name Forward iterators (only for debugging purpose)
+ ///@name Forward iterators
//@{
/// Forward iterator
/**
For some GC (like as \p gc::HP), a guard is a limited resource per thread, so an exception (or assertion) "no free guard"
may be thrown if the limit of guard count per thread is exceeded.
- The iterator cannot be moved across thread boundary because it contains thread-private GC's guard.
- - Iterator ensures thread-safety even if you delete the item the iterator points to. However, in case of concurrent
- deleting operations there is no guarantee that you iterate all item in the set.
- 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.
+ Iterator thread safety depends on type of \p OrderedList:
+ - for \p MichaelList and \p LazyList: iterator guarantees safety even if you delete the item that iterator points to
+ because that item is guarded by hazard pointer.
+ However, in case of concurrent deleting operations it is no guarantee that you iterate all item in the set.
+ Moreover, a crash is possible when you try to iterate the next element that has been deleted by concurrent thread.
+ Use this iterator on the concurrent container for debugging purpose only.
+ - for \p IterableList: iterator is thread-safe. You may use it freely in concurrent environment.
The iterator interface:
\code
*/
/// Forward iterator
- typedef michael_set::details::iterator< bucket_type, false > iterator;
+ typedef michael_set::details::iterator< internal_bucket_type, false > iterator;
/// Const forward iterator
- typedef michael_set::details::iterator< bucket_type, true > const_iterator;
+ typedef michael_set::details::iterator< internal_bucket_type, true > const_iterator;
/// Returns a forward iterator addressing the first element in a set
/**
*/
iterator begin()
{
- return iterator( m_Buckets[0].begin(), m_Buckets, m_Buckets + bucket_count() );
+ return iterator( bucket_begin()->begin(), bucket_begin(), bucket_end());
}
/// Returns an iterator that addresses the location succeeding the last element in a set
*/
iterator end()
{
- return iterator( m_Buckets[bucket_count() - 1].end(), m_Buckets + bucket_count() - 1, m_Buckets + bucket_count() );
+ return iterator( bucket_end()[-1].end(), bucket_end() - 1, bucket_end());
}
/// Returns a forward const iterator addressing the first element in a set
}
//@}
- private:
- //@cond
- const_iterator get_const_begin() const
- {
- return const_iterator( const_cast<internal_bucket_type const&>(m_Buckets[0]).begin(), m_Buckets, m_Buckets + bucket_count() );
- }
- const_iterator get_const_end() const
- {
- return const_iterator( const_cast<internal_bucket_type const&>(m_Buckets[bucket_count() - 1]).end(), m_Buckets + bucket_count() - 1, m_Buckets + bucket_count() );
- }
- //@endcond
-
public:
/// Initialize hash set
- /** @anchor cds_nonintrusive_MichaelHashSet_hp_ctor
+ /**
The Michael's hash set is non-expandable container. You should point the average count of items \p nMaxItemCount
when you create an object.
\p nLoadFactor parameter defines average count of items per bucket and it should be small number between 1 and 10.
size_t nMaxItemCount, ///< estimation of max item count in the hash set
size_t nLoadFactor ///< load factor: estimation of max number of items in the bucket
) : m_nHashBitmask( michael_set::details::init_hash_bitmask( nMaxItemCount, nLoadFactor ))
+ , m_Buckets( bucket_table_allocator().allocate( bucket_count()))
{
- // GC and OrderedList::gc must be the same
- static_assert( std::is_same<gc, typename bucket_type::gc>::value, "GC and OrderedList::gc must be the same");
-
- // atomicity::empty_item_counter is not allowed as a item counter
- static_assert( !std::is_same<item_counter, atomicity::empty_item_counter>::value,
- "cds::atomicity::empty_item_counter is not allowed as a item counter");
-
- m_Buckets = bucket_table_allocator().NewArray( bucket_count() );
+ for ( auto it = m_Buckets, itEnd = m_Buckets + bucket_count(); it != itEnd; ++it )
+ construct_bucket<bucket_stat>( it );
}
/// Clears hash set and destroys it
~MichaelHashSet()
{
clear();
- bucket_table_allocator().Delete( m_Buckets, bucket_count() );
+
+ for ( auto it = m_Buckets, itEnd = m_Buckets + bucket_count(); it != itEnd; ++it )
+ it->~internal_bucket_type();
+ bucket_table_allocator().deallocate( m_Buckets, bucket_count());
}
/// Inserts new node
Returns \p true if \p val is inserted into the set, \p false otherwise.
*/
template <typename Q>
- bool insert( Q const& val )
+ bool insert( Q&& val )
{
- const bool bRet = bucket( val ).insert( val );
+ const bool bRet = bucket( val ).insert( std::forward<Q>( val ));
if ( bRet )
++m_ItemCounter;
return bRet;
where \p val is the item inserted.
The user-defined functor is called only if the inserting is success.
- @warning For \ref cds_nonintrusive_MichaelList_gc "MichaelList" as the bucket see \ref cds_intrusive_item_creating "insert item troubleshooting".
+ @warning For \ref cds_nonintrusive_MichaelList_gc "MichaelList" and \ref cds_nonintrusive_IterableList_gc "IterableList"
+ as the bucket see \ref cds_intrusive_item_creating "insert item troubleshooting".
@ref cds_nonintrusive_LazyList_gc "LazyList" provides exclusive access to inserted item and does not require any node-level
synchronization.
*/
template <typename Q, typename Func>
- bool insert( Q const& val, Func f )
+ bool insert( Q&& val, Func f )
{
- const bool bRet = bucket( val ).insert( val, f );
+ const bool bRet = bucket( val ).insert( std::forward<Q>( val ), f );
if ( bRet )
++m_ItemCounter;
return bRet;
If the item \p val not found in the set, then \p val is inserted iff \p bAllowInsert is \p true.
Otherwise, the functor \p func is called with item found.
- The functor signature is:
+
+ The functor \p func signature depends of \p OrderedList:
+
+ <b>for \p MichaelList, \p LazyList</b>
\code
struct functor {
void operator()( bool bNew, value_type& item, Q const& val );
The functor may change non-key fields of the \p item.
- Returns <tt> std::pair<bool, bool> </tt> where \p first is \p true if operation is successfull,
+ <b>for \p IterableList</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.
+
+ @return <tt> std::pair<bool, bool> </tt> where \p first is \p true if operation is successful,
\p second is \p true if new item has been added or \p false if the item with \p key
already is in the set.
- @warning For \ref cds_intrusive_MichaelList_hp "MichaelList" as the bucket see \ref cds_intrusive_item_creating "insert item troubleshooting".
+ @warning For \ref cds_intrusive_MichaelList_hp "MichaelList" and \ref cds_nonintrusive_IterableList_gc "IterableList"
+ as the bucket see \ref cds_intrusive_item_creating "insert item troubleshooting".
\ref cds_intrusive_LazyList_hp "LazyList" provides exclusive access to inserted item and does not require any node-level
synchronization.
*/
template <typename Q, typename Func>
- std::pair<bool, bool> update( const Q& val, Func func, bool bAllowUpdate = true )
+ std::pair<bool, bool> update( Q&& val, Func func, bool bAllowUpdate = true )
{
- std::pair<bool, bool> bRet = bucket( val ).update( val, func, bAllowUpdate );
+ std::pair<bool, bool> bRet = bucket( val ).update( std::forward<Q>( val ), func, bAllowUpdate );
if ( bRet.second )
++m_ItemCounter;
return bRet;
}
//@endcond
+ /// Inserts or updates the node (only for \p IterableList)
+ /**
+ The operation performs inserting or changing data with lock-free manner.
+
+ If the item \p val is not found in the set, then \p val 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 set.
+ */
+ template <typename Q>
+#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&& val, bool bAllowInsert = true )
+ {
+ std::pair<bool, bool> bRet = bucket( val ).upsert( std::forward<Q>( val ), bAllowInsert );
+ if ( bRet.second )
+ ++m_ItemCounter;
+ return bRet;
+ }
+
/// 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 )
{
- typename internal_bucket_type::node_type * pNode = internal_bucket_type::alloc_node( std::forward<Args>( args )... );
- bool bRet = bucket( internal_bucket_type::node_to_value( *pNode )).insert_node( pNode );
+ bool bRet = bucket_emplace<internal_bucket_type>( std::forward<Args>(args)... );
if ( bRet )
++m_ItemCounter;
return bRet;
}
/// Deletes \p key from the set
- /** \anchor cds_nonintrusive_MichaelSet_erase_val
-
- Since the key of MichaelHashSet's item type \ref value_type is not explicitly specified,
+ /**
+ Since the key of MichaelHashSet's item type \p value_type is not explicitly specified,
template parameter \p Q defines the key type searching in the list.
The set item comparator should be able to compare the type \p value_type
and the type \p Q.
- Return \p true if key is found and deleted, \p false otherwise
+ Return \p true if key is found and deleted, \p false otherwise.
*/
template <typename Q>
bool erase( Q const& key )
/// Deletes the item from the set using \p pred predicate for searching
/**
- The function is an analog of \ref cds_nonintrusive_MichaelSet_erase_val "erase(Q const&)"
- but \p pred is used for key comparing.
+ The function is an analog of \p erase(Q const&) 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 set.
*/
}
/// Deletes \p key from the set
- /** \anchor cds_nonintrusive_MichaelSet_erase_func
-
+ /**
The function searches an item with key \p key, calls \p f functor
and deletes the item. If \p key is not found, the functor is not called.
/// Deletes the item from the set using \p pred predicate for searching
/**
- The function is an analog of \ref cds_nonintrusive_MichaelSet_erase_func "erase(Q const&, Func)"
- but \p pred is used for key comparing.
+ The function is an analog of \p erase(Q const&, Func) 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 set.
*/
michael_set theSet;
// ...
{
- michael_set::guarded_ptr gp( theSet.extract( 5 ));
+ typename michael_set::guarded_ptr gp( theSet.extract( 5 ));
if ( gp ) {
// Deal with gp
// ...
/// Extracts the item using compare functor \p pred
/**
- The function is an analog of \ref cds_nonintrusive_MichaelHashSet_hp_extract "extract(Q const&)"
+ The function is an analog of \p 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 Less functor has the semantics like \p std::less but should take arguments
+ of type \p value_type and \p Q in any order.
\p pred must imply the same element order as the comparator used for building the set.
*/
template <typename Q, typename Less>
}
/// Finds the key \p key
- /** \anchor cds_nonintrusive_MichaelSet_find_func
-
+ /**
The function searches the item with key equal to \p key and calls the functor \p f for item found.
The interface of \p Func functor is:
\code
}
//@endcond
+ /// 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 the set based on \p IterableList
+ */
+ template <typename Q>
+#ifdef CDS_DOXYGEN_INVOKED
+ iterator
+#else
+ typename std::enable_if< std::is_same<Q,Q>::value && is_iterable_list< ordered_list >::value, iterator >::type
+#endif
+ find( Q& key )
+ {
+ internal_bucket_type& b = bucket( key );
+ typename internal_bucket_type::iterator it = b.find( key );
+ if ( it == b.end())
+ return end();
+ return iterator( it, &b, bucket_end());
+ }
+ //@cond
+ template <typename Q>
+ typename std::enable_if< std::is_same<Q, Q>::value && is_iterable_list< ordered_list >::value, iterator >::type
+ find( Q const& key )
+ {
+ internal_bucket_type& b = bucket( key );
+ typename internal_bucket_type::iterator it = b.find( key );
+ if ( it == b.end())
+ return end();
+ return iterator( it, &b, bucket_end());
+ }
+ //@endcond
+
/// Finds the key \p key using \p pred predicate for searching
/**
- The function is an analog of \ref cds_nonintrusive_MichaelSet_find_func "find(Q&, Func)"
- but \p pred is used for key comparing.
+ The function is an analog of \p find(Q&, Func) 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 set.
*/
}
//@endcond
- /// Checks whether the set contains \p key
+ /// 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(Q&) 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 set.
+
+ If \p key is not found the function returns \p end().
+
+ @note This function is supported only for the set based on \p IterableList
+ */
+ template <typename Q, typename Less>
+#ifdef CDS_DOXYGEN_INVOKED
+ iterator
+#else
+ typename std::enable_if< std::is_same<Q, Q>::value && is_iterable_list< ordered_list >::value, iterator >::type
+#endif
+ find_with( Q& key, Less pred )
+ {
+ internal_bucket_type& b = bucket( key );
+ typename internal_bucket_type::iterator it = b.find_with( key, pred );
+ if ( it == b.end())
+ return end();
+ return iterator( it, &b, bucket_end());
+ }
+ //@cond
+ template <typename Q, typename Less>
+ typename std::enable_if< std::is_same<Q, Q>::value && is_iterable_list< ordered_list >::value, iterator >::type
+ find_with( Q const& key, Less pred )
+ {
+ internal_bucket_type& b = bucket( key );
+ typename internal_bucket_type::iterator it = b.find_with( key, pred );
+ if ( it == b.end())
+ return end();
+ return iterator( it, &b, bucket_end());
+ }
+ //@endcond
+ /// Checks whether the set contains \p key
+ /**
The function searches the item with key equal to \p key
and returns \p true if the key is found, and \p false otherwise.
{
return bucket( key ).contains( key );
}
- //@cond
- template <typename Q>
- CDS_DEPRECATED("use contains()")
- bool find( Q const& key )
- {
- return contains( key );
- }
- //@endcond
/// Checks whether the set contains \p key using \p pred predicate for searching
/**
{
return bucket( key ).contains( key, pred );
}
- //@cond
- template <typename Q, typename Less>
- CDS_DEPRECATED("use contains()")
- bool find_with( Q const& key, Less pred )
- {
- return contains( key, pred );
- }
- //@endcond
/// Finds the key \p key and return the item found
/** \anchor cds_nonintrusive_MichaelHashSet_hp_get
michael_set theSet;
// ...
{
- michael_set::guarded_ptr gp( theSet.get( 5 ));
+ typename michael_set::guarded_ptr gp( theSet.get( 5 ));
if ( gp ) {
// Deal with gp
//...
return m_ItemCounter;
}
+ /// Returns const reference to internal statistics
+ stat const& statistics() const
+ {
+ return m_Stat;
+ }
+
/// Returns the size of hash table
/**
Since MichaelHashSet cannot dynamically extend the hash table size,
{
return m_nHashBitmask + 1;
}
+
+ protected:
+ //@cond
+ /// Calculates hash value of \p key
+ template <typename Q>
+ size_t hash_value( Q const& key ) const
+ {
+ return m_HashFunctor( key ) & m_nHashBitmask;
+ }
+
+ /// Returns the bucket (ordered list) for \p key
+ template <typename Q>
+ internal_bucket_type& bucket( Q const& key )
+ {
+ return m_Buckets[ hash_value( key ) ];
+ }
+ template <typename Q>
+ internal_bucket_type const& bucket( Q const& key ) const
+ {
+ return m_Buckets[hash_value( key )];
+ }
+ //@endcond
+
+ private:
+ //@cond
+ internal_bucket_type* bucket_begin() const
+ {
+ return m_Buckets;
+ }
+
+ internal_bucket_type* bucket_end() const
+ {
+ return m_Buckets + bucket_count();
+ }
+
+ const_iterator get_const_begin() const
+ {
+ return const_iterator( bucket_begin()->cbegin(), bucket_begin(), bucket_end());
+ }
+ const_iterator get_const_end() const
+ {
+ return const_iterator(( bucket_end() -1 )->cend(), bucket_end() - 1, bucket_end());
+ }
+
+ template <typename Stat>
+ typename std::enable_if< Stat::empty >::type construct_bucket( internal_bucket_type* bucket )
+ {
+ new (bucket) internal_bucket_type;
+ }
+
+ template <typename Stat>
+ typename std::enable_if< !Stat::empty >::type construct_bucket( internal_bucket_type* bucket )
+ {
+ new (bucket) internal_bucket_type( m_Stat );
+ }
+
+ template <typename List, typename... Args>
+ typename std::enable_if< !is_iterable_list<List>::value, bool>::type
+ bucket_emplace( Args&&... args )
+ {
+ class list_accessor: public List
+ {
+ public:
+ using List::alloc_node;
+ using List::node_to_value;
+ using List::insert_node;
+ };
+
+ auto pNode = list_accessor::alloc_node( std::forward<Args>( args )... );
+ assert( pNode != nullptr );
+ return static_cast<list_accessor&>( bucket( list_accessor::node_to_value( *pNode ))).insert_node( pNode );
+ }
+
+ template <typename List, typename... Args>
+ typename std::enable_if< is_iterable_list<List>::value, bool>::type
+ bucket_emplace( Args&&... args )
+ {
+ class list_accessor: public List
+ {
+ public:
+ using List::alloc_data;
+ using List::insert_node;
+ };
+
+ auto pData = list_accessor::alloc_data( std::forward<Args>( args )... );
+ assert( pData != nullptr );
+ return static_cast<list_accessor&>( bucket( *pData )).insert_node( pData );
+ }
+ //@endcond
};
}} // namespace cds::container
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