Added thirdparty: boost library

thirdparty/include/boost/hana/is_empty.hpp

@@ -0,0 +1,45 @@
+/*!
+@file
+Defines `boost::hana::is_empty`.
+
+Copyright Louis Dionne 2013-2022
+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_EMPTY_HPP
+#define BOOST_HANA_IS_EMPTY_HPP
+
+#include <boost/hana/fwd/is_empty.hpp>
+
+#include <boost/hana/concept/iterable.hpp>
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/dispatch.hpp>
+
+
+namespace boost { namespace hana {
+    //! @cond
+    template <typename Xs>
+    constexpr auto is_empty_t::operator()(Xs const& xs) const {
+        using It = typename hana::tag_of<Xs>::type;
+        using IsEmpty = BOOST_HANA_DISPATCH_IF(is_empty_impl<It>,
+            hana::Iterable<It>::value
+        );
+
+    #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
+        static_assert(hana::Iterable<It>::value,
+        "hana::is_empty(xs) requires 'xs' to be an Iterable");
+    #endif
+
+        return IsEmpty::apply(xs);
+    }
+    //! @endcond
+
+    template <typename It, bool condition>
+    struct is_empty_impl<It, when<condition>> : default_ {
+        template <typename ...Args>
+        static constexpr auto apply(Args&& ...) = delete;
+    };
+}} // end namespace boost::hana
+
+#endif // !BOOST_HANA_IS_EMPTY_HPP