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 +1,77 @@
+// Boost.Signals library
+
+// Copyright Douglas Gregor 2001-2004.
+// Copyright Frank Mori Hess 2007. Use, modification and
+// distribution is subject to the Boost Software License, Version
+// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// For more information, see http://www.boost.org
+
+#ifndef BOOST_SIGNALS2_SIGNALS_COMMON_HPP
+#define BOOST_SIGNALS2_SIGNALS_COMMON_HPP
+
+#include <boost/mpl/bool.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/ref.hpp>
+#include <boost/signals2/signal_base.hpp>
+#include <boost/type_traits/is_base_of.hpp>
+
+namespace boost {
+  namespace signals2 {
+    namespace detail {
+      // Determine if the given type T is a signal
+      template<typename T>
+      class is_signal: public mpl::bool_<is_base_of<signal_base, T>::value>
+      {};
+
+      // A slot can be a signal, a reference to a function object, or a
+      // function object.
+      struct signal_tag {};
+      struct reference_tag {};
+      struct value_tag {};
+
+      // Classify the given slot as a signal, a reference-to-slot, or a
+      // standard slot
+      template<typename S>
+      class get_slot_tag {
+        typedef typename mpl::if_<is_signal<S>,
+          signal_tag, value_tag>::type signal_or_value;
+      public:
+        typedef typename mpl::if_<is_reference_wrapper<S>,
+                            reference_tag,
+                            signal_or_value>::type type;
+      };
+
+      // Get the slot so that it can be copied
+      template<typename F>
+      typename F::weak_signal_type
+      get_invocable_slot(const F &signal, signal_tag)
+      { return typename F::weak_signal_type(signal); }
+
+      template<typename F>
+      const F&
+      get_invocable_slot(const F& f, reference_tag)
+      { return f; }
+
+      template<typename F>
+      const F&
+      get_invocable_slot(const F& f, value_tag)
+      { return f; }
+
+      // Determines the type of the slot - is it a signal, a reference to a
+      // slot or just a normal slot.
+      template<typename F>
+      typename get_slot_tag<F>::type
+      tag_type(const F&)
+      {
+        typedef typename get_slot_tag<F>::type
+          the_tag_type;
+        the_tag_type tag = the_tag_type();
+        return tag;
+      }
+    } // end namespace detail
+  } // end namespace signals2
+} // end namespace boost
+
+#endif // BOOST_SIGNALS2_SIGNALS_COMMON_HPP