[#BloombergLP-bslstl-SharedPtrAllocateInplaceRep]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::SharedPtrAllocateInplaceRep
:relfileprefix: ../../
:mrdocs:

This class provides a concrete implementation of the `SharedPtrRep` protocol for in‐place instances of the (template parameter) `TYPE`. Upon destruction of this object, the destructor of `TYPE` is invoked on the shared object.

== Synopsis

Declared in `<bslstl_sharedptrallocateinplacerep.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class TYPE,
    class ALLOCATOR>
class SharedPtrAllocateInplaceRep
    : public xref:BloombergLP/bslma/SharedPtrRep.adoc[BloombergLP::bslma::SharedPtrRep]
----

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:BloombergLP/bslma/SharedPtrRep.adoc[BloombergLP::bslma::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.
|===

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/SharedPtrAllocateInplaceRep/ReboundAllocator.adoc[`ReboundAllocator`] 
| Allocator rebound to `SharedPtrAllocateInplaceRep`.
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslma/SharedPtrRep/acquireRef.adoc[`acquireRef`] 
| Atomically acquire a shared reference to the shared object referred to by this representation. The behavior is undefined unless `0 < numReferences()`.
| xref:BloombergLP/bslma/SharedPtrRep/acquireWeakRef.adoc[`acquireWeakRef`] 
| Atomically acquire a weak reference to the shared object referred to by this representation. The behavior is undefined unless `0 < numWeakReferences() || 0 < numReferences()`.
| xref:BloombergLP/bslstl/SharedPtrAllocateInplaceRep/disposeObject.adoc[`disposeObject`]  [.small]#[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.
| xref:BloombergLP/bslstl/SharedPtrAllocateInplaceRep/disposeRep.adoc[`disposeRep`]  [.small]#[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 method effectively serves as the representation object's destructor.
| xref:BloombergLP/bslstl/SharedPtrAllocateInplaceRep/getDeleter.adoc[`getDeleter`]  [.small]#[virtual]#
| Ignore the specified `type` and return a null pointer. Note that there is no facility for the user to supply a deleter for an in‐place representation for a shared pointer.
| xref:BloombergLP/bslma/SharedPtrRep/hasUniqueOwner.adoc[`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.
| xref:BloombergLP/bslma/SharedPtrRep/incrementRefs.adoc[`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()`.
| xref:BloombergLP/bslma/SharedPtrRep/numReferences.adoc[`numReferences`] 
| Return a "snapshot" of the current number of shared references to the shared object referred to by this representation object.
| xref:BloombergLP/bslma/SharedPtrRep/numWeakReferences.adoc[`numWeakReferences`] 
| Return a "snapshot" of the current number of weak references to the shared object referred to by this representation object.
| xref:BloombergLP/bslstl/SharedPtrAllocateInplaceRep/originalPtr.adoc[`originalPtr`]  [.small]#[virtual]#
| Return the (untyped) address of the modifiable shared object to which this object refers.
| xref:BloombergLP/bslstl/SharedPtrAllocateInplaceRep/ptr.adoc[`ptr`] 
| Return the address of the modifiable shared object to which this object refers. Note that in order to return a pointer to a modifiable object, this function cannot be `const` qualified as the referenced object is stored internally as a data member.
| xref:BloombergLP/bslma/SharedPtrRep/releaseRef.adoc[`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()`.
| xref:BloombergLP/bslma/SharedPtrRep/releaseWeakRef.adoc[`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()`.
| xref:BloombergLP/bslma/SharedPtrRep/resetCountsRaw.adoc[`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`.
| xref:BloombergLP/bslma/SharedPtrRep/tryAcquireRef.adoc[`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()`.
|===


== Static Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/SharedPtrAllocateInplaceRep/makeRep.adoc[`makeRep`] 
| Create a `SharedPtrAllocateInplaceRep` object having storage for an in‐place uninitialized object of (template parameter) `TYPE`, and return its address. Use the specified `basicAllocator` to supply memory and, upon a call to `disposeRep`, to destroy this representation (and the in‐place shared object). Note that the function members `ptr` and `originalPtr` will return the address of an uninitialized object. This object should be explicitly initialized by the caller, and it is undefined behavior to call `disposeRep` until this object has been successfully constructed.
| xref:BloombergLP/bslma/SharedPtrRep/managedPtrDeleter.adoc[`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`.
| xref:BloombergLP/bslma/SharedPtrRep/managedPtrEmptyDeleter.adoc[`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`.
|===



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