comparison DEPENDENCIES/generic/include/boost/parameter/aux_/cast.hpp @ 16:2665513ce2d3

Add boost headers

+// Copyright Daniel Wallin 2006. 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)
+
+#ifndef BOOST_PARAMETER_CAST_060902_HPP
+# define BOOST_PARAMETER_CAST_060902_HPP
+
+# include <boost/detail/workaround.hpp>
+
+# if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \
+  && !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
+#  include <boost/type_traits/add_reference.hpp>
+#  include <boost/type_traits/remove_const.hpp>
+# endif
+
+namespace boost { namespace parameter { namespace aux {
+
+struct use_default_tag {};
+
+# if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \
+  || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
+
+#  define BOOST_PARAMETER_FUNCTION_CAST(value, predicate) value
+
+# else
+
+// Handles possible implicit casts. Used by preprocessor.hpp to
+// normalize user input.
+//
+// cast<void*>::execute() is identity
+// cast<void*(X)>::execute() is identity
+// cast<void(X)>::execute() casts to X
+//
+// preprocessor.hpp uses this like this:
+//
+//   #define X(value, predicate)
+//      cast<void predicate>::execute(value)
+//
+//   X(something, *)
+//   X(something, *(predicate))
+//   X(something, (int))
+
+template <class T, class Args>
+struct cast;
+
+template <class Args>
+struct cast<void*, Args>
+{
+    static use_default_tag execute(use_default_tag)
+    {
+        return use_default_tag();
+    }
+
+    static use_default_tag remove_const(use_default_tag)
+    {
+        return use_default_tag();
+    }
+
+    template <class U>
+    static U& execute(U& value)
+    {
+        return value;
+    }
+
+    template <class U>
+    static U& remove_const(U& x)
+    {
+        return x;
+    }
+};
+
+#if BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x580))
+
+typedef void* voidstar;
+
+template <class T, class Args>
+struct cast<voidstar(T), Args>
+  : cast<void*, Args>
+{
+};
+
+#else
+
+template <class T, class Args>
+struct cast<void*(T), Args>
+  : cast<void*, Args>
+{
+};
+
+#endif
+
+// This is a hack used in cast<> to turn the user supplied type,
+// which may or may not be a placeholder expression into one, so
+// that it will be properly evaluated by mpl::apply.
+template <class T, class Dummy = mpl::_1>
+struct as_placeholder_expr
+{
+    typedef T type;
+};
+
+template <class T, class Args>
+struct cast<void(T), Args>
+{
+    typedef typename mpl::apply2<
+        as_placeholder_expr<T>, Args, Args>::type type0;
+
+    typedef typename boost::add_reference<
+        typename boost::remove_const<type0>::type 
+    >::type reference;
+
+    static use_default_tag execute(use_default_tag)
+    {
+        return use_default_tag();
+    }
+
+    static use_default_tag remove_const(use_default_tag)
+    {
+        return use_default_tag();
+    }
+
+    static type0 execute(type0 value)
+    {
+        return value;
+    }
+
+    template <class U>
+    static reference remove_const(U const& x)
+    {
+        return const_cast<reference>(x);
+    }
+};
+
+#  define BOOST_PARAMETER_FUNCTION_CAST(value, predicate, args) \
+    boost::parameter::aux::cast<void predicate, args>::remove_const( \
+        boost::parameter::aux::cast<void predicate, args>::execute(value) \
+    )
+
+# endif
+
+}}} // namespace boost::parameter::aux
+
+#endif // BOOST_PARAMETER_CAST_060902_HPP
+