typedef typename traits::stat stat; ///< internal statistics type
public:
- typedef cds::gc::guarded_ptr< gc, value_type > guarded_ptr; ///< Guarded pointer
+ typedef typename gc::template guarded_ptr< value_type > guarded_ptr; ///< Guarded pointer
/// Max node height. The actual node height should be in range <tt>[0 .. c_nMaxHeight)</tt>
/**
}
template <typename Q, typename Compare>
- bool get_with_( typename gc::Guard& guard, Q const& val, Compare cmp )
+ bool get_with_( typename guarded_ptr::native_guard& guard, Q const& val, Compare cmp )
{
- return find_with_( val, cmp, [&guard](value_type& found, Q const& ) { guard.assign(&found); } );
+ return find_with_( val, cmp, [&guard](value_type& found, Q const& ) { guard.set(&found); } );
}
template <typename Q, typename Compare, typename Func>
}
template <typename Q, typename Compare>
- bool extract_( typename gc::Guard& guard, Q const& val, Compare cmp )
+ bool extract_( typename guarded_ptr::native_guard& guard, Q const& val, Compare cmp )
{
position pos;
for (;;) {
if ( !find_position( val, pos, cmp, false ) ) {
m_Stat.onExtractFailed();
+ guard.clear();
return false;
}
node_type * pDel = pos.pCur;
- guard.assign( node_traits::to_value_ptr(pDel));
+ guard.set( node_traits::to_value_ptr(pDel));
assert( cmp( *node_traits::to_value_ptr( pDel ), val ) == 0 );
unsigned int nHeight = pDel->height();
m_Stat.onExtractSuccess();
return true;
}
-
m_Stat.onExtractRetry();
}
}
- bool extract_min_( typename gc::Guard& gDel )
+ bool extract_min_( typename guarded_ptr::native_guard& gDel )
{
position pos;
if ( !find_min_position( pos ) ) {
// The list is empty
m_Stat.onExtractMinFailed();
+ gDel.clear();
return false;
}
node_type * pDel = pos.pCur;
unsigned int nHeight = pDel->height();
- gDel.assign( node_traits::to_value_ptr(pDel) );
+ gDel.set( node_traits::to_value_ptr(pDel) );
if ( try_remove_at( pDel, pos, [](value_type const&) {} )) {
--m_ItemCounter;
}
}
- bool extract_max_( typename gc::Guard& gDel )
+ bool extract_max_( typename guarded_ptr::native_guard& gDel )
{
position pos;
if ( !find_max_position( pos ) ) {
// The list is empty
m_Stat.onExtractMaxFailed();
+ gDel.clear();
return false;
}
node_type * pDel = pos.pCur;
unsigned int nHeight = pDel->height();
- gDel.assign( node_traits::to_value_ptr(pDel) );
+ gDel.set( node_traits::to_value_ptr(pDel) );
if ( try_remove_at( pDel, pos, [](value_type const&) {} )) {
--m_ItemCounter;
/// Extracts the item from the set with specified \p key
/** \anchor cds_intrusive_SkipListSet_hp_extract
The function searches an item with key equal to \p key in the set,
- unlinks it from the set, 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 set, and returns it as \p guarded_ptr object.
+ 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.
- The \ref disposer specified in \p Traits class template parameter is called automatically
+ The \p disposer specified in \p Traits class template parameter is called automatically
by garbage collector \p GC specified in class' template parameters 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.
skip_list theList;
// ...
{
- skip_list::guarded_ptr gp;
- theList.extract( gp, 5 );
- // Deal with gp
- // ...
-
+ skip_list::guarded_ptr gp(theList.extract( 5 ));
+ if ( gp ) {
+ // Deal with gp
+ // ...
+ }
// Destructor of gp releases internal HP guard
}
\endcode
*/
template <typename Q>
- bool extract( guarded_ptr& dest, Q const& key )
+ guarded_ptr extract( Q const& key )
{
- return extract_( dest.guard(), key, key_comparator() );
+ guarded_ptr gp;
+ extract_( gp.guard(), key, key_comparator() );
+ return gp;
}
/// Extracts the item from the set with comparing functor \p pred
\p pred must imply the same element order as the comparator used for building the set.
*/
template <typename Q, typename Less>
- bool extract_with( guarded_ptr& dest, Q const& key, Less pred )
+ guarded_ptr extract_with( Q const& key, Less pred )
{
CDS_UNUSED( pred );
- return extract_( dest.guard(), key, cds::opt::details::make_comparator_from_less<Less>() );
+ guarded_ptr gp;
+ extract_( gp.guard(), key, cds::opt::details::make_comparator_from_less<Less>() );
+ return gp;
}
/// Extracts an item with minimal key from the list
/**
- The function searches an item with minimal key, unlinks it, and returns the item found in \p dest parameter.
- If the skip-list is empty the function returns \p false.
+ The function searches an item with minimal key, unlinks it, and returns it as \p guarded_ptr object.
+ If the skip-list is empty the function returns an empty guarded pointer.
@note Due the concurrent nature of the list, the function extracts <i>nearly</i> minimum key.
It means that the function gets leftmost item and tries to unlink it.
skip_list theList;
// ...
{
- skip_list::guarded_ptr gp;
- if ( theList.extract_min( gp )) {
+ skip_list::guarded_ptr gp(theList.extract_min());
+ if ( gp ) {
// Deal with gp
//...
}
}
\endcode
*/
- bool extract_min( guarded_ptr& dest)
+ guarded_ptr extract_min()
{
- return extract_min_( dest.guard() );
+ guarded_ptr gp;
+ extract_min_( gp.guard() );
+ return gp;
}
/// Extracts an item with maximal key from the list
/**
- The function searches an item with maximal key, unlinks it, and returns the pointer to item found in \p dest parameter.
- If the skip-list is empty the function returns empty \p guarded_ptr.
+ The function searches an item with maximal key, unlinks it, and returns the pointer to item
+ as \p guarded_ptr object.
+ If the skip-list is empty the function returns an empty \p guarded_ptr.
@note Due the concurrent nature of the list, the function extracts <i>nearly</i> maximal key.
It means that the function gets rightmost item and tries to unlink it.
skip_list theList;
// ...
{
- skip_list::guarded_ptr gp;
- if ( theList.extract_max( gp )) {
+ skip_list::guarded_ptr gp( theList.extract_max( gp ));
+ if ( gp ) {
// Deal with gp
//...
}
}
\endcode
*/
- bool extract_max( guarded_ptr& dest )
+ guarded_ptr extract_max()
{
- return extract_max_( dest.guard() );
+ guarded_ptr gp;
+ extract_max_( gp.guard() );
+ return gp;
}
/// Deletes the item from the set
/// Finds \p key and return the item found
/** \anchor cds_intrusive_SkipListSet_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 pointer to the item found as \p guarded_ptr.
+ If \p key is not found the function returns an empt guarded pointer.
- The \ref disposer specified in \p Traits class template parameter is called
+ The \p disposer specified in \p Traits class template parameter is called
by garbage collector \p GC asynchronously when returned \ref guarded_ptr object
will be destroyed or released.
@note Each \p guarded_ptr object uses one GC's guard which can be limited resource.
skip_list theList;
// ...
{
- skip_list::guarded_ptr gp;
- if ( theList.get( gp, 5 )) {
+ skip_list::guarded_ptr gp(theList.get( 5 ));
+ if ( gp ) {
// Deal with gp
//...
}
should accept a parameter of type \p Q that can be not the same as \p value_type.
*/
template <typename Q>
- bool get( guarded_ptr& ptr, Q const& key )
+ guarded_ptr get( Q const& key )
{
- return get_with_( ptr.guard(), key, key_comparator() );
+ guarded_ptr gp;
+ get_with_( gp.guard(), key, key_comparator() );
+ return gp;
}
/// Finds \p key and return the item found
/**
- The function is an analog of \ref cds_intrusive_SkipListSet_hp_get "get( guarded_ptr& ptr, Q const&)"
+ The function is an analog of \ref cds_intrusive_SkipListSet_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
\p pred must imply the same element order as the comparator used for building the set.
*/
template <typename Q, typename Less>
- bool get_with( guarded_ptr& ptr, Q const& key, Less pred )
+ guarded_ptr get_with( Q const& key, Less pred )
{
CDS_UNUSED( pred );
- return get_with_( ptr.guard(), key, cds::opt::details::make_comparator_from_less<Less>() );
+ guarded_ptr gp;
+ get_with_( gp.guard(), key, cds::opt::details::make_comparator_from_less<Less>() );
+ return gp;
}
/// Returns item count in the set
void clear()
{
guarded_ptr gp;
- while ( extract_min( gp ));
+ while ( extract_min_( gp.guard() ));
}
/// Returns maximum height of skip-list. The max height is a constant for each object and does not exceed 32.
projects / libcds.git / blobdiff