[#bsl-hash-017-operator_call-01]
= xref:bsl.adoc[bsl]::xref:bsl/hash-017.adoc[hash<basic_string<CHAR_TYPE, CHAR_TRAITS, ALLOCATOR>>]::operator()
:relfileprefix: ../../
:mrdocs:

Function call operators

== Synopses

Declared in `<bslh_hash.h>`

Compute and return the hash value of the specified `input`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::size_t
xref:bsl/hash-017/operator_call-05.adoc[operator()](xref:bsl/basic_string-0faf.adoc[basic_string<CHAR_TYPE, CHAR_TRAITS, ALLOCATOR>] const& input) const;
----

[.small]#xref:bsl/hash-017/operator_call-05.adoc[_» more..._]#

Compute and return the hash value of the contents of the specified null‐terminated `input`. This value will be the same as the hash value of a `basic_string` constructed from `input`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::size_t
xref:bsl/hash-017/operator_call-03.adoc[operator()](CHAR_TYPE const* input) const;
----

[.small]#xref:bsl/hash-017/operator_call-03.adoc[_» more..._]#

Returns a hash value generated by the (template parameter) type `HASH_ALGORITHM` for the specified `type`. The value returned by the `HASH_ALGORITHM` is cast to `size_t` before returning.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class TYPE>
xref:BloombergLP/bslh/Hash-02/result_type.adoc[bslh::Hash<bslh::DefaultHashAlgorithm>::result_type]
xref:BloombergLP/bslh/Hash-02/operator_call.adoc[operator()](TYPE const& key) const;
----

[.small]#xref:BloombergLP/bslh/Hash-02/operator_call.adoc[_» more..._]#


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