Added thirdparty: boost library

2026-08-14 19:28:09 +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::comparing`.
+
+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_COMPARING_HPP
+#define BOOST_HANA_COMPARING_HPP
+
+#include <boost/hana/fwd/comparing.hpp>
+
+#include <boost/hana/config.hpp>
+#include <boost/hana/detail/decay.hpp>
+#include <boost/hana/equal.hpp>
+
+
+namespace boost { namespace hana {
+    namespace detail {
+        template <typename F>
+        struct equal_by {
+            F f;
+
+            template <typename X, typename Y>
+            constexpr auto operator()(X&& x, Y&& y) const&
+            { return hana::equal(f(static_cast<X&&>(x)), f(static_cast<Y&&>(y))); }
+
+            template <typename X, typename Y>
+            constexpr auto operator()(X&& x, Y&& y) &
+            { return hana::equal(f(static_cast<X&&>(x)), f(static_cast<Y&&>(y))); }
+        };
+    }
+
+    //! @cond
+    template <typename F>
+    constexpr auto comparing_t::operator()(F&& f) const {
+        return detail::equal_by<typename detail::decay<F>::type>{static_cast<F&&>(f)};
+    }
+    //! @endcond
+}} // end namespace boost::hana
+
+#endif // !BOOST_HANA_COMPARING_HPP