[#bsl-is_function-06]
= xref:bsl.adoc[bsl]::xref:bsl/is_function-05.adoc[is&lowbar;function]&lt;t&lowbar;TYPE&&gt;
:relfileprefix: ../
:mrdocs:

Partial specialization of `is&lowbar;function` for lvalue references&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;class t&lowbar;TYPE&gt;
struct xref:bsl/is_function-05.adoc[is&lowbar;function]&lt;t&lowbar;TYPE&&gt;
    : xref:bsl/false_type.adoc[false&lowbar;type]
----

== Description

Reference types are, self&hyphen;evidently, never function types&period; The idiom for detecting function types in this component is that a function is a type that is the same as the const&hyphen;qualified version of that same type&period; As references also have this property, we must filter out references with this partial specialization&period;

== Base Classes

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


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