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-rw-r--r--boost/hana/concept/constant.hpp10
1 files changed, 6 insertions, 4 deletions
diff --git a/boost/hana/concept/constant.hpp b/boost/hana/concept/constant.hpp
index 1c85a20739..08e5db248f 100644
--- a/boost/hana/concept/constant.hpp
+++ b/boost/hana/concept/constant.hpp
@@ -15,15 +15,17 @@ Distributed under the Boost Software License, Version 1.0.
#include <boost/hana/config.hpp>
#include <boost/hana/core/default.hpp>
#include <boost/hana/core/tag_of.hpp>
+#include <boost/hana/detail/integral_constant.hpp>
#include <boost/hana/value.hpp>
BOOST_HANA_NAMESPACE_BEGIN
template <typename C>
- struct Constant {
- using Tag = typename tag_of<C>::type;
- static constexpr bool value = !is_default<value_impl<Tag>>::value;
- };
+ struct Constant
+ : hana::integral_constant<bool,
+ !is_default<value_impl<typename tag_of<C>::type>>::value
+ >
+ { };
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_CONCEPT_CONSTANT_HPP