BloombergLP::bslma::SharedPtrOutofplaceRep

Name

Description

SharedPtrRep

This class provides a partially implemented shared pointer representation ("letter") protocol. The class provides two counters for storing the number of shared and weak references, and functions to increment and decrement these counters. In addition, this class provides protocol methods that allow concrete implementations to specify what action should be taken when these counts reach zero. The function disposeRep is responsible for destroying this object, it is called when the reference count to this object reaches zero. Thus, the destructor of this object is declared as protected and should never be invoked.

Name

Description

acquireRef

Atomically acquire a shared reference to the shared object referred to by this representation. The behavior is undefined unless 0 < numReferences().

acquireWeakRef

Atomically acquire a weak reference to the shared object referred to by this representation. The behavior is undefined unless 0 < numWeakReferences() || 0 < numReferences().

disposeObject [virtual]

Destroy the object being referred to by this representation. This method is automatically invoked by releaseRef when the number of shared references reaches zero and should not be explicitly invoked otherwise.

disposeRep [virtual]

Destroy this representation object and deallocate the associated memory. This method is automatically invoked by releaseRef and releaseWeakRef when the number of weak references and the number of shared references both reach zero and should not be explicitly invoked otherwise. The behavior is undefined unless disposeObject has already been called for this representation. Note that this disposeRep method effectively serves as the representation object's destructor.

getDeleter [virtual]

Return a pointer to the deleter stored by the derived representation (if any) if the deleter has the same type as that described by the specified type, and a null pointer otherwise.

hasUniqueOwner

Return true if there is only one shared reference and no weak references to the object referred to by this representation, and false otherwise.

incrementRefs

Atomically increment the number of shared references to the shared object referred to by this representation by the optionally specified incrementAmount. The behavior is undefined unless 0 < incrementAmount and 0 < numReferences().

numReferences

Return a "snapshot" of the current number of shared references to the shared object referred to by this representation object.

numWeakReferences

Return a "snapshot" of the current number of weak references to the shared object referred to by this representation object.

originalPtr [virtual]

Return the (untyped) address of the modifiable shared object to which this object refers.

ptr

Return the address of the modifiable shared object to which this object refers.

releaseRef

Atomically release a shared reference to the shared object referred to by this representation, disposing of the shared object if all the shared references to that object are released, and disposing of this representation if all (shared and weak) references to that object are released. The behavior is undefined unless 0 < numReferences().

releaseWeakRef

Atomically release a weak reference to the shared object referred to by this representation, disposing of this representation if all (shared and weak) references to the shared object are released. The behavior is undefined unless 0 < numWeakReferences().

resetCountsRaw

Reset the number of shared references and the number of weak references stored by this representation to the specified numSharedReferences and numWeakReferences respectively. This function is not thread‐safe and users must ensure that they serialize access to the SharedPtrRep object when calling this function. Note that this function updates the counts, but does not dispose of the representation or the object irrespective of the values of numSharedReferences and numWeakReferences.

tryAcquireRef

Atomically acquire a shared reference to the shared object referred to by this representation, if the number of shared references is greater than 0, and do nothing otherwise. Return true if the acquire succeeds, and false otherwise. The behavior is undefined unless 0 < numWeakReferences() || 0 < numReferences().

Name

Description

makeOutofplaceRep

Return the address of a newly created SharedPtrOutofplaceRep object that manages the lifetime of the specified ptr, using the specified deleter to destroy ptr. Optionally, specify a basicAllocator used to supply memory. If basicAllocator is 0, the currently installed default allocator is used. Note that the parameterized DELETER type will be used to deallocate the memory pointed to by ptr.

managedPtrDeleter

Release the shared reference to an object held by the SharedPtrRep object that is pointed to be by specified rep. The behavior is undefined unless rep points to an object whose complete type publicly and unambiguously derives from SharedPtrRep. Note that the first argument is ignored. Also note that this function serves as the ManagedPtr deleter when converting a bsl::shared_ptr to a bslma::ManagedPtr.

managedPtrEmptyDeleter

This function has no effect. The behavior is undefined unless rep is null. Note that this function serves as the managed ptr deleter when converting an empty or null bsl::shared_ptr to a bslma::ManagedPtr.