[#BloombergLP-bslstl-Function_InvokerUtil_IsFuncInvocable-05]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::Function_InvokerUtil_IsFuncInvocable
:relfileprefix: ../../
:mrdocs:

forward declaration

== Synopsis

Declared in `<bslstl_function_invokerutil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class PROTOTYPE,
    class FUNC>
struct Function_InvokerUtil_IsFuncInvocable;
----

== Specializations

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/Function_InvokerUtil_IsFuncInvocable-0e.adoc[`Function_InvokerUtil_IsFuncInvocable<RET(ARGS...), FUNC>`] 
| This `struct` template implements a Boolean metafunction that publicly inherits from `bsl::true_type` if an object of the specified `FUNC` type is invocable with the specified `RET` and `ARGS...`, and publicly inherits from `bsl::false_type` otherwise. An object of `FUNC` type is invocable with `RET` and `ARGS...` if it is Lvalue‐Callable with arguments having the types of the `ARGS...`, and returns an object of type explicitly convertible to `RET`. If `RET` is `void`, then any type is considered explicitly convertible to `RET`.
|===


== Derived Classes

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/Function_InvokerUtil/IsFuncInvocable.adoc[`IsFuncInvocable`] 
| This `struct` template implements a Boolean metafunction that publicly inherits from `bsl::true_type` if an object of the specified `FUNC` type is invocable under the specified `PROTOTYPE`, and publicly inherits from `bsl::false_type` otherwise. An object of `FUNC` type is invocable under the `PROTOTYPE` if it is Lvalue‐Callable with the arguments of the `PROTOTYPE` (as forwarded by the facilities of 'bslmf_forwardingtype), and returns an object of type explicitly convertible to the return type of the `PROTOTYPE`. If the return type of the `PROTOTYPE` is `void`, then any type is considered explicitly convertible to the return type of the `PROTOTYPE`. This `struct` template requires `PROTOTYPE` to be an unqualified function type.
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#