movable exempt_ptr: SplitList

[libcds.git] / cds / container / split_list_set_rcu.h

diff --git a/cds/container/split_list_set_rcu.h b/cds/container/split_list_set_rcu.h
index 938bbc7cf182bd4f786a3845394a47d3ee74ea2d..013b6d7459c676916cac7c101caa42225536f97a 100644 (file)
--- a/cds/container/split_list_set_rcu.h
+++ b/cds/container/split_list_set_rcu.h
@@ -200,7 +200,7 @@ namespace cds { namespace container {
 
     public:
         /// pointer to extracted node
-        typedef cds::urcu::exempt_ptr< gc, node_type, value_type, typename maker::ordered_list_traits::disposer > exempt_ptr;
+        using exempt_ptr = cds::urcu::exempt_ptr< gc, node_type, value_type, typename maker::ordered_list_traits::disposer >;
 
     protected:
         //@cond
@@ -583,8 +583,8 @@ namespace cds { namespace container {
         /// Extracts an item from the set
         /** \anchor cds_nonintrusive_SplitListSet_rcu_extract
             The function searches an item with key equal to \p key in the set,
-            unlinks it from the set, places item pointer into \p dest argument, and returns \p true.
-            If the item with the key equal to \p key is not found the function return \p false.
+            unlinks it from the set, and returns \ref cds::urcu::exempt_ptr "exempt_ptr" pointer to the item found.
+            If the item with the key equal to \p key is not found the function returns an empty \p exempt_ptr.
 
             @note The function does NOT call RCU read-side lock or synchronization,
             and does NOT dispose the item found. It just excludes the item from the set
@@ -606,7 +606,8 @@ namespace cds { namespace container {
 
                 // Now, you can apply extract function
                 // Note that you must not delete the item found inside the RCU lock
-                if ( theSet.extract( p, 10 )) {
+                p = theSet.extract( 10 );
+                if ( p ) {
                     // do something with p
                     ...
                 }
@@ -618,14 +619,9 @@ namespace cds { namespace container {
             \endcode
         */
         template <typename Q>
-        bool extract( exempt_ptr& dest, Q const& key )
+        exempt_ptr extract( Q const& key )
         {
-            node_type * pNode = base_class::extract_( key, key_comparator() );
-            if ( pNode ) {
-                dest = pNode;
-                return true;
-            }
-            return false;
+            return exempt_ptr( base_class::extract_( key, key_comparator() ));
         }
 
         /// Extracts an item from the set using \p pred predicate for searching
@@ -636,14 +632,9 @@ namespace cds { namespace container {
             \p pred must imply the same element order as the comparator used for building the set.
         */
         template <typename Q, typename Less>
-        bool extract_with( exempt_ptr& dest, Q const& key, Less pred )
+        exempt_ptr extract_with( Q const& key, Less pred )
         {
-            node_type * pNode = base_class::extract_with_( key, typename maker::template predicate_wrapper<Less>::type());
-            if ( pNode ) {
-                dest = pNode;
-                return true;
-            }
-            return false;
+            return exempt_ptr( base_class::extract_with_( key, typename maker::template predicate_wrapper<Less>::type()));
         }
 
         /// Finds the key \p key