-// Copyright Louis Dionne 2013-2016
+// Copyright Louis Dionne 2013-2017
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
#include <boost/hana/core/default.hpp>
#include <boost/hana/core/tag_of.hpp>
+#include <boost/hana/integral_constant.hpp>
#include <string>
#include <type_traits>
};
template <typename T>
-struct Printable {
- using Tag = hana::tag_of_t<T>;
- static constexpr bool value = !std::is_base_of<special_base_class, print_impl<Tag>>::value;
-};
+struct Printable
+ : hana::integral_constant<bool,
+ !std::is_base_of<special_base_class, print_impl<hana::tag_of_t<T>>>::value
+ >
+{ };
//! [special_base_class]
//! [special_base_class_customize]
};
template <typename T>
-struct Printable {
- using Tag = hana::tag_of_t<T>;
- static constexpr bool value = !hana::is_default<print_impl<Tag>>::value;
-};
+struct Printable
+ : hana::integral_constant<bool,
+ !hana::is_default<print_impl<hana::tag_of_t<T>>>::value
+ >
+{ };
//! [actual]
static_assert(!Printable<void>::value, "");