[#BloombergLP-bslmf-IsTransparentPredicate-0f]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslmf.adoc[bslmf]::IsTransparentPredicate
:relfileprefix: ../../
:mrdocs:

This `struct` template implements a meta‐function to determine whether the (template parameter) `t_COMPARATOR` is transparent (has a publicly accessible member that is a type named `is_transparent`). This generic default template derives from `bsl::false_type`. Template specializations are provided (below) that derive from `bsl::true_type`.

== Synopsis

Declared in `<bslmf_istransparentpredicate.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class t_COMPARATOR,
    class t_KEY,
    class = void>
struct IsTransparentPredicate
    : xref:bsl/false_type.adoc[bsl::false_type]
----

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:bsl/false_type.adoc[bsl::false_type]`
| Metafunction representing the boolean constant `false`.
|===

== Specializations

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslmf/IsTransparentPredicate-0c.adoc[`IsTransparentPredicate<t_COMPARATOR, t_KEY, bsl::void_t<t_COMPARATOR::is_transparent>>`] 
| This specialization of `IsTransparentPredicate`, for when the (template parameter) `t_COMPARATOR` is transparent, derives from `bsl::true_type`.
|===



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