stabilize build system: depends, installer, boost/bdb fixes, cross targets groundwork

2026-02-24 18:38:47 +00:00
parent da8c28aaeb
commit 65cb2619a7
13106 changed files with 2484322 additions and 1804 deletions
@@ -0,0 +1,48 @@
+/*!
+@file
+Defines `boost::hana::duplicate`.
+
+@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_DUPLICATE_HPP
+#define BOOST_HANA_DUPLICATE_HPP
+
+#include <boost/hana/fwd/duplicate.hpp>
+
+#include <boost/hana/concept/comonad.hpp>
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/dispatch.hpp>
+#include <boost/hana/extend.hpp>
+#include <boost/hana/functional/id.hpp>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+    //! @cond
+    template <typename W_>
+    constexpr decltype(auto) duplicate_t::operator()(W_&& w) const {
+        using W = typename hana::tag_of<W_>::type;
+        using Duplicate = BOOST_HANA_DISPATCH_IF(duplicate_impl<W>,
+            hana::Comonad<W>::value
+        );
+
+    #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
+        static_assert(hana::Comonad<W>::value,
+        "hana::duplicate(w) requires 'w' to be a Comonad");
+    #endif
+
+        return Duplicate::apply(static_cast<W_&&>(w));
+    }
+    //! @endcond
+
+    template <typename W, bool condition>
+    struct duplicate_impl<W, when<condition>> : default_ {
+        template <typename X>
+        static constexpr decltype(auto) apply(X&& x)
+        { return hana::extend(static_cast<X&&>(x), hana::id); }
+    };
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_DUPLICATE_HPP