[#bsl-shared_ptr-0a-2constructor-08d]
= xref:bsl.adoc[bsl]::xref:bsl/shared_ptr-0a.adoc[shared_ptr]::shared_ptr
:relfileprefix: ../../
:mrdocs:

Create a shared pointer that refers to and manages the same object as the specified `ptr` if `ptr.expired()` is `false`; otherwise, create a shared pointer in the empty state. Note that the referenced and managed objects may be different if `ptr` was created from a `shared_ptr` in an aliasing state.

== Synopsis

Declared in `<bslstl_sharedptr.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class COMPATIBLE_TYPE>
explicit
shared_ptr(xref:bsl/weak_ptr-0d.adoc[weak_ptr<COMPATIBLE_TYPE>] const& ptr);
----


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