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

This `struct` defines a hash operation for different types, enabling them for use for heterogeneous lookup in the standard associative containers such as `bsl::unordered_map`. Note that this class is an empty POD type.

== Synopsis

Declared in `<bdlb_transparenthash.h>`

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

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlb/TransparentHash/is_transparent.adoc[`is_transparent`] 
| Type alias indicating this is a transparent hash functor.
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlb/TransparentHash/operator_call.adoc[`operator()`] 
| Return a hash code generated from the contents of the specified `value`.
|===



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