update sources to v12.2.3

[ceph.git] / ceph / src / boost / boost / hana / concept / iterable.hpp

diff --git a/ceph/src/boost/boost/hana/concept/iterable.hpp b/ceph/src/boost/boost/hana/concept/iterable.hpp
new file mode 100644 (file)
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+++ b/ceph/src/boost/boost/hana/concept/iterable.hpp
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+/*!
+@file
+Defines `boost::hana::Iterable`.
+
+@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)
+ */
+
+#ifndef BOOST_HANA_CONCEPT_ITERABLE_HPP
+#define BOOST_HANA_CONCEPT_ITERABLE_HPP
+
+#include <boost/hana/fwd/concept/iterable.hpp>
+
+#include <boost/hana/at.hpp>
+#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/drop_front.hpp>
+#include <boost/hana/is_empty.hpp>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+    template <typename It>
+    struct Iterable
+        : hana::integral_constant<bool,
+            !is_default<at_impl<typename tag_of<It>::type>>::value &&
+            !is_default<drop_front_impl<typename tag_of<It>::type>>::value &&
+            !is_default<is_empty_impl<typename tag_of<It>::type>>::value
+        >
+    { };
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_CONCEPT_ITERABLE_HPP