[#std-hash-0e9-operator_call]
= xref:std.adoc[std]::xref:std/hash-0e9.adoc[hash<folly::propagate_const<Pointer>>]::operator()
:relfileprefix: ../../
:mrdocs:

Hash a wrapper by hashing its underlying pointer.

== Synopsis

Declared in `<folly/lang/PropagateConst.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
size_t
operator()(xref:folly/propagate_const.adoc[folly::propagate_const<Pointer>] const& obj) const;
----

== Return Value

The hash of the underlying pointer.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *obj*
| The wrapper to hash.
|===


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