[#bsl-shared_ptr-0a-unique]
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:mrdocs:

Return `true` if this shared pointer is not empty and does not share ownership of the object it managed with any other shared pointer, and `false` otherwise. Note that a shared pointer with a custom deleter can refer to a null pointer without being empty, and so may be `unique`. Also note that the result of this function may not be reliable in a multi‐threaded program, where a weak pointer may be locked on another thread.

== Synopsis

Declared in `<bslstl_sharedptr.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
unique() const noexcept;
----

== Description

DEPRECATED: This function is deprecated in C++17 because its correctness is not guaranteed since the value returned by the used `use_count` function is approximate.


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