add is_function_pointer

[gpeterhoff]

is_function_pointer like is_member_function_pointer

//	Distributed under the Boost Software License Version 1.0 https://www.boost.org/LICENSE_1_0.txt
//	Copyright Gero Peterhoff

#ifndef BOOST_TYPE_TRAITS_IS_FUNCTION_POINTER_HPP
#define BOOST_TYPE_TRAITS_IS_FUNCTION_POINTER_HPP

#include <boost/type_traits/remove_pointer.hpp>
#include <boost/type_traits/is_function.hpp>
#include <boost/type_traits/is_pointer.hpp>



namespace boost
{
template <typename Type>
struct is_function_pointer : public integral_constant
<
	bool,
	is_pointer<Type>::value && is_function<typename remove_pointer<Type>::type>::value
>	{};

#if !defined(BOOST_NO_CXX17_INLINE_VARIABLES)
template <typename Type> inline constexpr bool is_function_pointer_v = is_function_pointer<Type>::value;
#endif
}	//	boost

#endif	//	BOOST_TYPE_TRAITS_IS_FUNCTION_POINTER_HPP