[#BloombergLP-bdlf-Bind_Evaluator-0b]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlf.adoc[bdlf]::Bind_Evaluator
:relfileprefix: ../../
:mrdocs:

This utility provides a default argument evaluator that simply returns whatever value is passed.

== Synopsis

Declared in `<bdlf_bind.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class BINDER,
    class t_ARG_TUPLE>
struct Bind_Evaluator;
----

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlf/Bind_Evaluator-0b/BoundType.adoc[`BoundType`] 
| Forwarding type of the bound argument value.
|===


== Static Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlf/Bind_Evaluator-0b/eval.adoc[`eval`] 
| Return the specified bound value unchanged.
|===


== Specializations

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlf/Bind_Evaluator-01.adoc[`Bind_Evaluator<PlaceHolder<t_INDEX>, t_ARG_TUPLE>`] 
| Argument evaluator that substitutes a place‐holder with a call argument.
| xref:BloombergLP/bdlf/Bind_Evaluator-05.adoc[`Bind_Evaluator<Bind<t_RET, t_FUNC, t_BOUND_TUPLE>, t_ARG_TUPLE>`] 
| Evaluator specialization for nested `Bind` arguments.
| xref:BloombergLP/bdlf/Bind_Evaluator-0a.adoc[`Bind_Evaluator<BindWrapper<t_RET, t_FUNC, t_BOUND_TUPLE>, t_ARG_TUPLE>`] 
| Evaluator specialization for nested `BindWrapper` arguments.
|===



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