Added thirdparty: boost library

thirdparty/include/boost/hana/or.hpp

@@ -0,0 +1,61 @@
+/*!
+@file
+Defines `boost::hana::or_`.
+
+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_OR_HPP
+#define BOOST_HANA_OR_HPP
+
+#include <boost/hana/fwd/or.hpp>
+
+#include <boost/hana/concept/logical.hpp>
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/dispatch.hpp>
+#include <boost/hana/detail/variadic/foldl1.hpp>
+#include <boost/hana/if.hpp>
+
+
+namespace boost { namespace hana {
+    //! @cond
+    template <typename X, typename Y>
+    constexpr decltype(auto) or_t::operator()(X&& x, Y&& y) const {
+        using Bool = typename hana::tag_of<X>::type;
+        using Or = BOOST_HANA_DISPATCH_IF(or_impl<Bool>,
+            hana::Logical<Bool>::value
+        );
+
+    #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
+        static_assert(hana::Logical<Bool>::value,
+        "hana::or_(x, y) requires 'x' to be a Logical");
+    #endif
+
+        return Or::apply(static_cast<X&&>(x), static_cast<Y&&>(y));
+    }
+
+    template <typename X, typename ...Y>
+    constexpr decltype(auto) or_t::operator()(X&& x, Y&& ...y) const {
+        return detail::variadic::foldl1(
+            *this,
+            static_cast<X&&>(x),
+            static_cast<Y&&>(y)...
+        );
+    }
+    //! @endcond
+
+    template <typename L, bool condition>
+    struct or_impl<L, when<condition>> : hana::default_ {
+        template <typename X, typename Y>
+        static constexpr decltype(auto) apply(X&& x, Y&& y) {
+            //! @todo How to forward `x` here? Since the arguments to `if_`
+            //! can be evaluated in any order, we have to be careful not to
+            //! use `x` in a moved-from state.
+            return hana::if_(x, x, static_cast<Y&&>(y));
+        }
+    };
+}} // end namespace boost::hana
+
+#endif // !BOOST_HANA_OR_HPP