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

Meta‐function to determine if a type is a free function pointer.

== Synopsis

Declared in `<bslmf_functionpointertraits.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_PROTOTYPE>
struct IsFunctionPointer
    : xref:bsl/integral_constant-02.adoc[bsl::integral_constant<bool, FunctionPointerTraits<t_PROTOTYPE>::IS_FUNCTION_POINTER>]
----

== Description

This template determines if the specified `t_PROTOTYPE` is a free (i.e., non‐member) function pointer. `value` is defined as 1 if the specified `t_PROTOTYPE` is a function pointer type, and a zero value otherwise.

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:bsl/integral_constant-02.adoc[bsl::integral_constant<bool, FunctionPointerTraits<t_PROTOTYPE>::IS_FUNCTION_POINTER>]`
| Metafunction representing a compile‐time constant of the specified (template parameter) `t_TYPE` with the specified (template parameter) `t_VALUE`.
|===

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:bsl/integral_constant-02/type.adoc[`type`] 
| Alias for this `integral_constant` specialization.
| xref:bsl/integral_constant-02/value_type.adoc[`value_type`] 
| Alias for the (template parameter) `t_TYPE`.
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:bsl/integral_constant-02/operator_call.adoc[`operator()`] 
| Return a copy of the template argument `t_VALUE`.
| xref:bsl/integral_constant-02/2conversion.adoc[`operator t_TYPE`] 
| Return a copy of the template argument `t_VALUE`.
|===


== Static Data Members

[cols="1,4"]
|===
| Name| Description
| xref:bsl/integral_constant-02/value.adoc[`value`] 
| The compile‐time constant value of this metafunction.
|===



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