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 +1,93 @@
+/*!
+@file
+Defines `boost::hana::eval_if`.
+
+@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_EVAL_IF_HPP
+#define BOOST_HANA_EVAL_IF_HPP
+
+#include <boost/hana/fwd/eval_if.hpp>
+
+#include <boost/hana/bool.hpp>
+#include <boost/hana/concept/constant.hpp>
+#include <boost/hana/concept/logical.hpp>
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/dispatch.hpp>
+#include <boost/hana/eval.hpp>
+#include <boost/hana/if.hpp>
+
+#include <type_traits>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+    //! @cond
+    template <typename Cond, typename Then, typename Else>
+    constexpr decltype(auto) eval_if_t::operator()(Cond&& cond, Then&& then_, Else&& else_) const {
+        using Bool = typename hana::tag_of<Cond>::type;
+        using EvalIf = BOOST_HANA_DISPATCH_IF(eval_if_impl<Bool>,
+            hana::Logical<Bool>::value
+        );
+
+    #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
+        static_assert(hana::Logical<Bool>::value,
+        "hana::eval_if(cond, then, else) requires 'cond' to be a Logical");
+    #endif
+
+        return EvalIf::apply(static_cast<Cond&&>(cond),
+                             static_cast<Then&&>(then_),
+                             static_cast<Else&&>(else_));
+    }
+    //! @endcond
+
+    template <typename L, bool condition>
+    struct eval_if_impl<L, when<condition>> : default_ {
+        template <typename ...Args>
+        static constexpr auto apply(Args&& ...) = delete;
+    };
+
+    //////////////////////////////////////////////////////////////////////////
+    // Model for arithmetic data types
+    //////////////////////////////////////////////////////////////////////////
+    template <typename L>
+    struct eval_if_impl<L, when<std::is_arithmetic<L>::value>> {
+        template <typename Cond, typename T, typename E>
+        static constexpr auto apply(Cond const& cond, T&& t, E&& e) {
+            return cond ? hana::eval(static_cast<T&&>(t))
+                        : hana::eval(static_cast<E&&>(e));
+        }
+    };
+
+    //////////////////////////////////////////////////////////////////////////
+    // Model for Constants over a Logical
+    //////////////////////////////////////////////////////////////////////////
+    template <typename C>
+    struct eval_if_impl<C, when<
+        hana::Constant<C>::value &&
+        Logical<typename C::value_type>::value
+    >> {
+        template <typename Then, typename Else>
+        static constexpr decltype(auto)
+        eval_if_helper(hana::true_, Then&& t, Else&&)
+        { return hana::eval(static_cast<Then&&>(t)); }
+
+        template <typename Then, typename Else>
+        static constexpr decltype(auto)
+        eval_if_helper(hana::false_, Then&&, Else&& e)
+        { return hana::eval(static_cast<Else&&>(e)); }
+
+        template <typename Cond, typename Then, typename Else>
+        static constexpr decltype(auto) apply(Cond const&, Then&& t, Else&& e) {
+            constexpr auto cond = hana::value<Cond>();
+            constexpr bool truth_value = hana::if_(cond, true, false);
+            return eval_if_helper(hana::bool_<truth_value>{},
+                                  static_cast<Then&&>(t),
+                                  static_cast<Else&&>(e));
+        }
+    };
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_EVAL_IF_HPP