[#absl-WeakenPtr]
= xref:absl.adoc[absl]::WeakenPtr
:relfileprefix: ../
:mrdocs:

Create a weak pointer from a shared pointer.

== Synopsis

Declared in `<absl/memory/memory.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<typename T>
std::weak_ptr<T>
WeakenPtr(std::shared_ptr<T> const& ptr);
----

== Description

Creates a weak pointer associated with a given shared pointer. The returned value is a `std::weak_ptr` of deduced type.

Example:

auto sp = std::make_shared<int>(10); auto wp = absl::WeakenPtr(sp); CHECK_EQ(sp.get(), wp.lock().get()); sp.reset(); CHECK(wp.lock() == nullptr);

== Return Value

A `std::weak_ptr` referring to the value owned by `ptr`.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ptr*
| The shared pointer to observe.
|===


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