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

DEPRECATED: Use `ForwardingType` instead.

== Synopsis

Declared in `<bslmf_forwardingtype.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_TYPE>
struct ConstForwardingType
    : xref:BloombergLP/bslmf/ForwardingType-07.adoc[ForwardingType<t_TYPE>]
----

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:BloombergLP/bslmf/ForwardingType-07.adoc[ForwardingType<t_TYPE>]`
| This template metafunction has a member `Type` computed such that, for a specified `t_TYPE` parameter, a function with argument of `t_TYPE` can be called efficiently from another function (e.g., a wrapper) by declaring the corresponding parameter of the other wrapper as 'typename ForwardingType<t_TYPE>::Type'. The `Type` member is computed to minimize the number of expensive copies while forwarding the arguments as faithfully as possible.
|===

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslmf/ForwardingType-07/TargetType.adoc[`TargetType`] 
| The closest type used to "reconstitute" `t_TYPE` from `ForwardingType<t_TYPE>::Type`. This type may differ from `t_TYPE` through the addition of a reference.
| xref:BloombergLP/bslmf/ForwardingType-07/Type.adoc[`Type`] 
| The type that should be used to forward `t_TYPE` through a chain of function calls.
|===



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