[#BloombergLP-bdlb-CStringHash]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::CStringHash
:relfileprefix: ../../
:mrdocs:

This `struct` defines a hash operation for null‐terminated character strings enabling them to be used as keys in the standard unordered associative containers such as `bsl::unordered_map` and `bsl::unordered_set`. Note that this class is an empty POD type.

== Synopsis

Declared in `<bdlb_cstringhash.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct CStringHash;
----

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlb/CStringHash/argument_type.adoc[`argument_type`] 
| Type of the argument to the function‐call operator.
| xref:BloombergLP/bdlb/CStringHash/result_type.adoc[`result_type`] 
| Type of the hash code returned by the function‐call operator.
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlb/CStringHash/operator_call.adoc[`operator()`] 
| Return a hash code generated from the contents of the specified null‐terminated `argument` string. The behavior is undefined unless `argument` points to a null‐terminated string.
| xref:BloombergLP/bdlb/CStringHash/2conversion.adoc[`operator BloombergLP::bslmf::NestedTraitDeclaration<CStringHash, is_trivially_default_constructible>`] 
| Declare that this type is trivially copyable.
|===



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