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

This `struct` defines a hash operation for string views enabling `bsl::string`s or `bsl::string_view`s 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_caselessstringviewhash.h>`

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

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlb/CaselessStringViewHash/argument_type.adoc[`argument_type`] 
| Type of the argument to the function‐call operator.
| xref:BloombergLP/bdlb/CaselessStringViewHash/is_transparent.adoc[`is_transparent`] 
| Type alias indicating this is a transparent hash functor.
| xref:BloombergLP/bdlb/CaselessStringViewHash/result_type.adoc[`result_type`] 
| Type of the function‐call operator's result (a hash value).
|===


== Member Functions

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



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