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diff --git a/boost/hana/is_disjoint.hpp b/boost/hana/is_disjoint.hpp
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+/*!
+@file
+Defines `boost::hana::is_disjoint`.
+
+@copyright Louis Dionne 2013-2016
+Distributed under the Boost Software License, Version 1.0.
+(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
+ */
+
+#ifndef BOOST_HANA_IS_DISJOINT_HPP
+#define BOOST_HANA_IS_DISJOINT_HPP
+
+#include <boost/hana/fwd/is_disjoint.hpp>
+
+#include <boost/hana/concept/searchable.hpp>
+#include <boost/hana/config.hpp>
+#include <boost/hana/contains.hpp>
+#include <boost/hana/core/dispatch.hpp>
+#include <boost/hana/none_of.hpp>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+    //! @cond
+    template <typename Xs, typename Ys>
+    constexpr auto is_disjoint_t::operator()(Xs&& xs, Ys&& ys) const {
+        using S1 = typename hana::tag_of<Xs>::type;
+        using S2 = typename hana::tag_of<Ys>::type;
+        using IsDisjoint = BOOST_HANA_DISPATCH_IF(
+            decltype(is_disjoint_impl<S1, S2>{}),
+            hana::Searchable<S1>::value &&
+            hana::Searchable<S2>::value
+        );
+
+    #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
+        static_assert(hana::Searchable<S1>::value,
+        "hana::is_disjoint(xs, ys) requires 'xs' to be Searchable");
+
+        static_assert(hana::Searchable<S2>::value,
+        "hana::is_disjoint(xs, ys) requires 'ys' to be Searchable");
+    #endif
+
+        return IsDisjoint::apply(static_cast<Xs&&>(xs), static_cast<Ys&&>(ys));
+    }
+    //! @endcond
+
+    namespace detail {
+        template <typename Ys>
+        struct in_by_reference {
+            Ys const& ys;
+            template <typename X>
+            constexpr auto operator()(X const& x) const
+            { return hana::contains(ys, x); }
+        };
+    }
+
+    template <typename S1, typename S2, bool condition>
+    struct is_disjoint_impl<S1, S2, when<condition>> : default_ {
+        template <typename Xs, typename Ys>
+        static constexpr auto apply(Xs const& xs, Ys const& ys) {
+            return hana::none_of(xs, detail::in_by_reference<Ys>{ys});
+        }
+    };
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_IS_DISJOINT_HPP