Name
const_accessor — Provides read-only access to a pair in a concurrent_hash_map
.
Synopsis
#include "tbb/concurrent_hash_map.h" template<typename Key, typename T, typename HashCompare> class concurrent_hash_ map<Key,T,HashCompare>::const_accessor;
Description
A const_accessor
permits read-only access to a key-value pair in a concurrent_hash_map
.
Members
namespace tbb { template<typename Key, typename T, typename HashCompare> class concurrent_hash_map<Key,T,HashCompare>::const_accessor { public: // types typedef const std::pair<const Key,T> value_type; // construction and destruction const_accessor(); ~const_accessor(); // inspection bool empty() const; const value_type& operator*() const; const value_type* operator->() const; // early release void release(); }; }
-
bool empty() const
Returns:
true
if the instance points to nothing;false
if the instance points to a key-value pair.-
void release()
Effects: if the instance contains a key-value pair, releases the implied lock on the pair and sets the instance to point to nothing. Otherwise, does nothing.
-
constvalue_type&operator*() const
Effects: raises an assertion failure if
empty()
is true andTBB_DO_ASSERT
is defined as nonzero.Returns:
const
reference to a key-value pair.-
constvalue_type*operator->() const
Returns:
&operator*()
*-
const_accessor()
Effects: constructs a
const_accessor
that points to nothing.-
~const_accessor
Effects: if pointing to a key-value pair, releases the implied lock on the pair.
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