bsl::is_function

Synopsis

Declared in <bslmf_isfunction.h>

template<class t_TYPE>
struct is_function
    : bsl::integral_constant<bool, !is_const<const t_TYPE>::value>

Description

This struct template implements the is_function meta-function defined in the C++11 standard [meta.unary.cat]to determine if the (template parameter) t_TYPE is a function type. This struct derives from bsl::true_type if the t_TYPE is a function type, and from bsl::false_type otherwise. This implementation relies on the fact that neither function types nor reference types can be cv-qualified so that is_const<const t_TYPE> will actually yield false.

Base Classes

Name	Description
`bsl::integral_constant<bool, !is_const<const t_TYPE>::value>`	Metafunction representing a compile-time constant of the specified (template parameter) `t_TYPE` with the specified (template parameter) `t_VALUE`.

Type Aliases

Name	Description
`type`	Alias for this `integral_constant` specialization.
`value_type`	Alias for the (template parameter) `t_TYPE`.

Member Functions

Name	Description
`operator()`	Return a copy of the template argument `t_VALUE`.
`operator t_TYPE`	Return a copy of the template argument `t_VALUE`.

Static Data Members

Name	Description
`value`	The compile-time constant value of this metafunction.

Specializations

Name	Description
`is_function<t_TYPE&>`	Partial specialization of `is_function` for lvalue references.
`is_function<t_TYPE&&>`	Partial specialization of `is_function` for rvalue references.