Added thirdparty: boost library

2026-08-15 03:38:09 +00:00 · 2024-01-06 19:55:56 +02:00
parent bf49f439e1
commit bccd1e7051
15683 changed files with 3239840 additions and 0 deletions
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+/*!
+@file
+Defines `boost::hana::make`.
+
+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_CORE_MAKE_HPP
+#define BOOST_HANA_CORE_MAKE_HPP
+
+#include <boost/hana/fwd/core/make.hpp>
+
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/default.hpp>
+#include <boost/hana/core/when.hpp>
+
+
+namespace boost { namespace hana {
+    //! @cond
+    template <typename Datatype, typename>
+    struct make_impl : make_impl<Datatype, when<true>> { };
+    //! @endcond
+
+    template <typename Datatype, bool condition>
+    struct make_impl<Datatype, when<condition>> : default_ {
+        template <typename ...X>
+        static constexpr auto make_helper(int, X&& ...x)
+            -> decltype(Datatype(static_cast<X&&>(x)...))
+        { return Datatype(static_cast<X&&>(x)...); }
+
+        template <typename ...X>
+        static constexpr auto make_helper(long, X&& ...) {
+            static_assert(((void) sizeof...(X), false),
+            "there exists no constructor for the given data type");
+        }
+
+        template <typename ...X>
+        static constexpr decltype(auto) apply(X&& ...x)
+        { return make_helper(int{}, static_cast<X&&>(x)...); }
+    };
+}} // end namespace boost::hana
+
+#endif // !BOOST_HANA_CORE_MAKE_HPP