-//$$CDS-header$$
-
-#ifndef __CDS_CONTAINER_IMPL_LAZY_KVLIST_H
-#define __CDS_CONTAINER_IMPL_LAZY_KVLIST_H
+/*
+ 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_IMPL_LAZY_KVLIST_H
+#define CDSLIB_CONTAINER_IMPL_LAZY_KVLIST_H
#include <memory>
-#include <functional> // ref
#include <cds/container/details/guarded_ptr_cast.h>
namespace cds { namespace container {
The complexity of searching is <tt>O(N)</tt>.
Template arguments:
- - \p GC - garbage collector used
- - \p Key - key type of an item stored in the list. It should be copy-constructible
- - \p Value - value type stored in the list
- - \p Traits - type traits, default is lazy_list::type_traits
-
- It is possible to declare option-based list with cds::container::lazy_list::make_traits metafunction istead of \p Traits template
- argument. For example, the following traits-based declaration of gc::HP lazy list
- \code
- #include <cds/container/lazy_kvlist_hp.h>
- // Declare comparator for the item
- struct my_compare {
- int operator ()( int i1, int i2 )
+ - \p GC - garbage collector
+ - \p Key - key type of an item to be stored in the list. It should be copy-constructible
+ - \p Value - value 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 cds::container::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_kvlist_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
{
- return i1 - i2;
- }
- };
+ typedef my_compare compare;
+ };
- // Declare type_traits
- struct my_traits: public cds::container::lazy_list::type_traits
- {
- typedef my_compare compare;
- };
+ // Declare traits-based list
+ typedef cds::container::LazyKVList< cds::gc::HP, int, int, my_traits > traits_based_list;
+ \endcode
+ is equal to the following option-based list
+ \code
+ #include <cds/container/lazy_kvlist_hp.h>
+
+ // my_compare is the same
- // Declare traits-based list
- typedef cds::container::LazyKVList< cds::gc::HP, int, int, my_traits > traits_based_list;
- \endcode
-
- is equivalent for the following option-based list
- \code
- #include <cds/container/lazy_kvlist_hp.h>
-
- // my_compare is the same
-
- // Declare option-based list
- typedef cds::container::LazyKVList< cds::gc::HP, int, int,
- typename cds::container::lazy_list::make_traits<
- cds::container::opt::compare< my_compare > // item comparator option
- >::type
- > option_based_list;
- \endcode
-
- Template argument list \p Options of cds::container::lazy_list::make_traits metafunction are:
- - opt::compare - key comparison functor. No default functor is provided.
- If the option is not specified, the opt::less is used.
- - opt::less - specifies binary predicate used for key comparison. Default is \p std::less<T>.
- - opt::back_off - back-off strategy used. If the option is not specified, the cds::backoff::empty is used.
- - opt::item_counter - the type of item counting feature. Default is \ref atomicity::empty_item_counter that is no item counting.
- - opt::allocator - the allocator used for creating and freeing list's item. Default is \ref CDS_DEFAULT_ALLOCATOR macro.
- - opt::memory_model - C++ memory ordering model. Can be opt::v::relaxed_ordering (relaxed memory model, the default)
- or opt::v::sequential_consistent (sequentially consisnent memory model).
+ // Declare option-based list
+ typedef cds::container::LazyKVList< cds::gc::HP, int, int,
+ typename cds::container::lazy_list::make_traits<
+ cds::container::opt::compare< my_compare > // item comparator option
+ >::type
+ > option_based_list;
+ \endcode
\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: \code #include <cds/container/lazy_kvlist_hp.h> \endcode
- - for gc::DHP: \code #include <cds/container/lazy_kvlist_dhp.h> \endcode
- - for \ref cds_urcu_desc "RCU": \code #include <cds/container/lazy_kvlist_rcu.h> \endcode
- - for gc::nogc: \code #include <cds/container/lazy_kvlist_nogc.h> \endcode
+ - for \p gc::HP: <tt> <cds/container/lazy_kvlist_hp.h> </tt>
+ - for \p gc::DHP: <tt> <cds/container/lazy_kvlist_dhp.h> </tt>
+ - for \ref cds_urcu_desc "RCU": <tt> <cds/container/lazy_kvlist_rcu.h> </tt>
+ - for \p gc::nogc: <tt> <cds/container/lazy_kvlist_nogc.h> </tt>
*/
template <
typename GC,
typename Key,
typename Value,
#ifdef CDS_DOXYGEN_INVOKED
- typename Traits = lazy_list::type_traits
+ typename Traits = lazy_list::traits
#else
typename Traits
#endif
#endif
{
//@cond
- typedef details::make_lazy_kvlist< GC, Key, Value, Traits > options;
- typedef typename options::type base_class;
+ typedef details::make_lazy_kvlist< GC, Key, Value, Traits > maker;
+ typedef typename maker::type base_class;
//@endcond
public:
+ typedef GC gc; ///< Garbage collector
#ifdef CDS_DOXYGEN_INVOKED
typedef Key key_type ; ///< Key type
typedef Value mapped_type ; ///< Type of value stored in the list
typedef std::pair<key_type const, mapped_type> value_type ; ///< key/value pair stored in the list
#else
- typedef typename options::key_type key_type;
- typedef typename options::value_type mapped_type;
- typedef typename options::pair_type value_type;
+ typedef typename maker::key_type key_type;
+ typedef typename maker::mapped_type mapped_type;
+ typedef typename maker::value_type value_type;
#endif
+ typedef typename base_class::back_off back_off; ///< Back-off strategy
+ typedef typename maker::allocator_type allocator_type; ///< Allocator type used for allocate/deallocate the nodes
+ typedef typename base_class::item_counter item_counter; ///< Item counter type
+ typedef typename maker::key_comparator key_comparator; ///< key comparing functor
+ typedef typename base_class::memory_model memory_model; ///< Memory ordering. See \p cds::opt::memory_model
- typedef typename base_class::gc gc ; ///< Garbage collector used
- typedef typename base_class::back_off back_off ; ///< Back-off strategy used
- typedef typename options::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 options::key_comparator key_comparator ; ///< key comparison functor
- typedef typename base_class::memory_model memory_model ; ///< Memory ordering. See cds::opt::memory_model option
+ static CDS_CONSTEXPR const size_t c_nHazardPtrCount = base_class::c_nHazardPtrCount; ///< Count of hazard pointer required for the algorithm
protected:
//@cond
- typedef typename base_class::value_type node_type;
- typedef typename options::cxx_allocator cxx_allocator;
- typedef typename options::node_deallocator node_deallocator;
- typedef typename options::type_traits::compare intrusive_key_comparator;
+ 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;
+ typedef typename base_class::node_type head_type;
//@endcond
public:
/// Guarded pointer
- typedef cds::gc::guarded_ptr< gc, node_type, value_type, details::guarded_ptr_cast_map<node_type, value_type> > guarded_ptr;
+ typedef typename gc::template guarded_ptr< node_type, value_type, details::guarded_ptr_cast_map<node_type, value_type> > guarded_ptr;
protected:
//@cond
head_type& head()
{
- return *base_class::head();
+ return base_class::m_Head;
}
head_type const& head() const
{
- return *base_class::head();
+ return base_class::m_Head;
}
head_type& tail()
{
- return *base_class::tail();
+ return base_class::m_Tail;
}
head_type const& tail() const
{
- return *base_class::tail();
+ return base_class::m_Tail;
}
//@endcond
- 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.
- Therefore, the use of iterators in concurrent environment is not good idea. Use the iterator on the concurrent container
- for debug purpose only.
+ @warning Use this iterator on the concurrent container for debugging purpose only.
The iterator interface to access item data:
- <tt> operator -> </tt> - returns a pointer to \ref value_type for iterator
*/
typedef iterator_type<true> const_iterator;
+ ///@name Forward iterators (only for debugging purpose)
+ //@{
/// Returns a forward iterator addressing the first element in a list
/**
For empty list \code begin() == end() \endcode
}
/// Returns a forward const iterator addressing the first element in a list
- //@{
const_iterator begin() const
{
const_iterator it( head() );
++it; // skip dummy head
return it;
}
- const_iterator cbegin()
+
+ /// Returns a forward const iterator addressing the first element in a list
+ const_iterator cbegin() const
{
const_iterator it( head() );
++it; // skip dummy head
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());
}
- const_iterator cend()
+
+ /// 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
- /**
- Initializes empty list
- */
LazyKVList()
{}
- /// List destructor
- /**
- Clears the list
- */
+ /// Destructor clears the list
~LazyKVList()
{
clear();
The argument \p item of user-defined functor \p func is the reference
to the list'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 list's item by concurrent threads.
- The user-defined functor can be passed by reference using \p std::ref
- and it is called only if inserting is successful.
+ The user-defined functor is called only if inserting is successful.
- The key_type should be constructible from value of type \p K.
+ The \p key_type should be constructible from value of type \p K.
The function allows to split creating of new item into two part:
- create item from \p key;
it is preferable that the initialization should be completed only if inserting is successful.
*/
template <typename K, typename Func>
- bool insert_key( const K& key, Func func )
+ bool insert_with( const K& key, Func func )
{
- return insert_key_at( head(), key, func );
+ return insert_with_at( head(), key, func );
}
/// Inserts data of type \ref mapped_type constructed with <tt>std::forward<Args>(args)...</tt>
return emplace_at( head(), std::forward<Args>(args)... );
}
- /// Ensures that the \p key exists in the list
+ /// Updates data by \p key
/**
- The operation performs inserting or changing data with lock-free manner.
+ 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
- is inserted into the list (note that in this case the \ref key_type should be
- copy-constructible from type \p K).
- 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:
+ will be inserted iff \p bAllowInsert is \p true.
+ (note that in this case the \ref key_type should be constructible from type \p K).
+ 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 );
};
\endcode
-
with arguments:
- \p bNew - \p true if the item has been inserted, \p false otherwise
- - \p item - item of the list
-
- The functor may change any fields of the \p item.second that is \ref mapped_type;
- however, \p func must guarantee that during changing no any other modifications
- could be made on this item by concurrent threads.
+ - \p item - the item found or inserted
- You may pass \p func argument by reference using \p std::ref.
+ The functor may change any fields of the \p item.second of \p mapped_type;
+ 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 successfull,
\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 exists.
*/
template <typename K, typename Func>
+ std::pair<bool, bool> update( const K& key, Func f, bool bAllowInsert = true )
+ {
+ return update_at( head(), key, f, bAllowInsert );
+ }
+ //@cond
+ template <typename K, typename Func>
+ CDS_DEPRECATED("ensure() is deprecated, use update()")
std::pair<bool, bool> ensure( const K& key, Func f )
{
- return ensure_at( head(), key, f );
+ return update( key, f, true );
}
+ //@endcond
/// Deletes \p key from the list
/** \anchor cds_nonintrusive_LazyKVList_hp_erase_val
template <typename K, typename Less>
bool erase_with( K const& key, Less pred )
{
- return erase_at( head(), key, typename options::template less_wrapper<Less>::type() );
+ CDS_UNUSED( pred );
+ return erase_at( head(), key, typename maker::template less_wrapper<Less>::type() );
}
/// Deletes \p key from the list
void operator()(value_type& val) { ... }
};
\endcode
- The functor may be passed by reference with <tt>boost:ref</tt>
Returns \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 )
{
- return erase_at( head(), key, typename options::template less_wrapper<Less>::type(), 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_LazyKVList_hp_extract
The function searches an item with key equal to \p key,
- unlinks it from the list, 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 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 K that can be not the same as \p key_type.
ord_list theList;
// ...
{
- ord_list::guarded_ptr gp;
- theList.extract( gp, 5 );
- // Deal with gp
- // ...
-
+ 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 K>
- bool extract( guarded_ptr& dest, K const& key )
+ guarded_ptr extract( K const& key )
{
- return extract_at( head(), dest.guard(), key, intrusive_key_comparator() );
+ guarded_ptr gp;
+ extract_at( head(), gp.guard(), key, intrusive_key_comparator() );
+ return gp;
}
/// Extracts the item from the list with comparing functor \p pred
/**
- The function is an analog of \ref cds_nonintrusive_LazyKVList_hp_extract "extract(guarded_ptr&, K const&)"
+ The function is an analog of \ref cds_nonintrusive_LazyKVList_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 key_type and \p K
\p pred must imply the same element order as the comparator used for building the list.
*/
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 extract_at( head(), dest.guard(), key, typename options::template less_wrapper<Less>::type() );
+ CDS_UNUSED( pred );
+ guarded_ptr gp;
+ extract_at( head(), gp.guard(), key, typename maker::template less_wrapper<Less>::type() );
+ return gp;
}
- /// Finds the key \p key
- /** \anchor cds_nonintrusive_LazyKVList_hp_find_val
+ /// 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
+ and returns \p true if it is found, and \p false otherwise.
*/
template <typename Q>
- bool find( Q const& key )
+ 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
- /// 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_LazyKVList_hp_find_val "find(Q const&)"
- but \p pred is used for key comparing.
+ 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.
+ \p Less 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 find_at( head(), key, typename options::template less_wrapper<Less>::type() );
+ return contains( key, pred );
}
+ //@endcond
/// Finds the key \p key and performs an action with it
/** \anchor cds_nonintrusive_LazyKVList_hp_find_func
\endcode
where \p item is the item found.
- You may pass \p f argument by reference using \p std::ref.
-
The functor may change <tt>item.second</tt> that is reference to value of node.
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
template <typename Q, typename Less, typename Func>
bool find_with( Q const& key, Less pred, Func f )
{
- return find_at( head(), key, typename options::template less_wrapper<Less>::type(), f );
+ CDS_UNUSED( pred );
+ return find_at( head(), key, typename maker::template less_wrapper<Less>::type(), f );
}
/// Finds \p key and return the item found
/** \anchor cds_nonintrusive_LazyKVList_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 functions returns an empty \p guarded_ptr.
@note Each \p guarded_ptr object uses one GC's guard which can be limited resource.
ord_list theList;
// ...
{
- ord_list::guarded_ptr gp;
- if ( theList.get( gp, 5 )) {
+ ord_list::guarded_ptr gp( theList.get( 5 ));
+ if ( gp ) {
// Deal with gp
//...
}
should accept a parameter of type \p K that can be not the same as \p key_type.
*/
template <typename K>
- bool get( guarded_ptr& ptr, K const& key )
+ guarded_ptr get( K const& key )
{
- return get_at( head(), ptr.guard(), key, intrusive_key_comparator() );
+ guarded_ptr gp;
+ get_at( head(), gp.guard(), key, intrusive_key_comparator() );
+ return gp;
}
/// Finds the key \p val and return the item found
/**
- The function is an analog of \ref cds_nonintrusive_LazyKVList_hp_get "get(guarded_ptr& ptr, K const&)"
+ The function is an analog of \ref cds_nonintrusive_LazyKVList_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 key_type and \p K
\p pred must imply the same element order as the comparator used for building the list.
*/
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 get_at( head(), ptr.guard(), key, typename options::template less_wrapper<Less>::type() );
+ CDS_UNUSED( pred );
+ guarded_ptr gp;
+ get_at( head(), gp.guard(), key, typename maker::template less_wrapper<Less>::type() );
+ return gp;
}
/// Checks if the list is empty
The value returned depends on opt::item_counter option. For atomicity::empty_item_counter,
this function always returns 0.
- <b>Warning</b>: even if you use real item counter and it returns 0, this fact is not mean that the list
+ @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
}
/// Clears the list
- /**
- Post-condition: the list is empty
- */
void clear()
{
base_class::clear();
}
template <typename K, typename Func>
- bool insert_key_at( head_type& refHead, const K& key, Func f )
+ bool insert_with_at( head_type& refHead, const K& key, Func f )
{
scoped_node_ptr pNode( alloc_node( key ));
}
template <typename K, typename Compare>
- bool extract_at( head_type& refHead, typename gc::Guard& dest, K const& key, Compare cmp )
+ bool extract_at( head_type& refHead, typename guarded_ptr::native_guard& guard, K const& key, Compare cmp )
{
- return base_class::extract_at( &refHead, dest, key, cmp );
+ return base_class::extract_at( &refHead, guard, key, cmp );
}
template <typename K, typename Func>
- std::pair<bool, bool> ensure_at( head_type& refHead, const K& key, Func f )
+ std::pair<bool, bool> update_at( head_type& refHead, const K& key, Func f, bool bAllowInsert )
{
scoped_node_ptr pNode( alloc_node( key ));
- std::pair<bool, bool> ret = base_class::ensure_at( &refHead, *pNode,
- [&f]( bool bNew, node_type& node, node_type& ){ f( bNew, node.m_Data ); });
+ std::pair<bool, bool> ret = base_class::update_at( &refHead, *pNode,
+ [&f]( bool bNew, node_type& node, node_type& ){ f( bNew, node.m_Data ); },
+ bAllowInsert );
if ( ret.first && ret.second )
pNode.release();
}
template <typename K, typename Compare>
- bool get_at( head_type& refHead, typename gc::Guard& guard, K const& key, Compare cmp )
+ bool get_at( head_type& refHead, typename guarded_ptr::native_guard& guard, K const& key, Compare cmp )
{
return base_class::get_at( &refHead, guard, key, cmp );
}
}} // namespace cds::container
-#endif // #ifndef __CDS_CONTAINER_IMPL_LAZY_KVLIST_H
+#endif // #ifndef CDSLIB_CONTAINER_IMPL_LAZY_KVLIST_H
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