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 +1,73 @@
+/*!
+@file
+Defines `boost::hana::flip`.
+
+@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_FUNCTIONAL_FLIP_HPP
+#define BOOST_HANA_FUNCTIONAL_FLIP_HPP
+
+#include <boost/hana/config.hpp>
+#include <boost/hana/detail/create.hpp>
+
+#include <utility>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+    //! @ingroup group-functional
+    //! Invoke a function with its two first arguments reversed.
+    //!
+    //! Specifically, `flip(f)` is a function such that
+    //! @code
+    //!     flip(f)(x, y, z...) == f(y, x, z...)
+    //! @endcode
+    //!
+    //! ### Example
+    //! @include example/functional/flip.cpp
+#ifdef BOOST_HANA_DOXYGEN_INVOKED
+    constexpr auto flip = [](auto&& f) {
+        return [perfect-capture](auto&& x, auto&& y, auto&& ...z) -> decltype(auto) {
+            return forwarded(f)(forwarded(y), forwarded(x), forwarded(z)...);
+        };
+    };
+#else
+    template <typename F>
+    struct flip_t {
+        F f;
+
+        template <typename X, typename Y, typename ...Z>
+        constexpr decltype(auto) operator()(X&& x, Y&& y, Z&& ...z) const& {
+            return f(
+                static_cast<Y&&>(y),
+                static_cast<X&&>(x),
+                static_cast<Z&&>(z)...
+            );
+        }
+
+        template <typename X, typename Y, typename ...Z>
+        constexpr decltype(auto) operator()(X&& x, Y&& y, Z&& ...z) & {
+            return f(
+                static_cast<Y&&>(y),
+                static_cast<X&&>(x),
+                static_cast<Z&&>(z)...
+            );
+        }
+
+        template <typename X, typename Y, typename ...Z>
+        constexpr decltype(auto) operator()(X&& x, Y&& y, Z&& ...z) && {
+            return std::move(f)(
+                static_cast<Y&&>(y),
+                static_cast<X&&>(x),
+                static_cast<Z&&>(z)...
+            );
+        }
+    };
+
+    constexpr detail::create<flip_t> flip{};
+#endif
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_FUNCTIONAL_FLIP_HPP