[#BloombergLP-bslmf-SelectTraitCase-Eval]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslmf.adoc[bslmf]::xref:BloombergLP/bslmf/SelectTraitCase.adoc[SelectTraitCase]::Eval
:relfileprefix: ../../../
:mrdocs:

Evaluates `t&lowbar;TRAIT` for the specified (template parameter) `T` type&period;

== Synopsis

Declared in `&lt;bslmf&lowbar;selecttrait&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;class t&lowbar;TYPE&gt;
struct Eval
    : t&lowbar;TRAIT&lt;t&lowbar;TYPE&gt;::type
----

== Description

The resulting `Eval&lt;T&gt;` instantiation is derived from `true&lowbar;type` if `t&lowbar;TRAIT&lt;T&gt;` is derived from `true&lowbar;type` and `false&lowbar;type` if `t&lowbar;TRAIT&lt;T&gt;` is derived from `false&lowbar;type`&period; (More generally, `Eval&lt;T&gt;` is derived from `t&lowbar;TRAIT&lt;T&gt;&colon;&colon;type`&period;)

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `t&lowbar;TRAIT&lt;t&lowbar;TYPE&gt;::type`
| 
|===


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