Add SCons configure checks

[senf.git] / boost_ext / boost / parameter / binding.hpp

diff --git a/boost_ext/boost/parameter/binding.hpp b/boost_ext/boost/parameter/binding.hpp
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+++ b/boost_ext/boost/parameter/binding.hpp
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+// Copyright David Abrahams 2005. Distributed under 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_BINDING_DWA200558_HPP
+# define BOOST_PARAMETER_BINDING_DWA200558_HPP
+
+# include <boost/mpl/apply.hpp>
+# include <boost/parameter/aux_/result_of0.hpp>
+
+#  include <boost/parameter/aux_/void.hpp>
+
+# if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+#  include <boost/parameter/aux_/void.hpp>
+#  include <boost/type_traits/is_same.hpp>
+# endif 
+
+namespace boost { namespace parameter { 
+
+// A metafunction that, given an argument pack, returns the type of
+// the parameter identified by the given keyword.  If no such
+// parameter has been specified, returns Default
+# if !BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+template <class Parameters, class Keyword, class Default = void>
+struct binding
+  : mpl::apply_wrap2<
+        typename Parameters::binding,Keyword,Default
+    >
+{};
+# else
+template <class Parameters, class Keyword, class Default = aux::void_>
+struct binding
+{
+    typedef typename mpl::apply_wrap2<
+        typename Parameters::binding,Keyword,
+        typename mpl::if_<is_same<Default,aux::void_>,void,Default>::type
+    >::type type;
+};
+# endif
+
+// A metafunction that, given an argument pack, returns the type of
+// the parameter identified by the given keyword.  If no such
+// parameter has been specified, returns the type returned by invoking
+// DefaultFn
+template <class Parameters, class Keyword, class DefaultFn>
+struct lazy_binding
+{
+  typedef typename mpl::apply_wrap2<
+      typename Parameters::binding
+    , Keyword
+    , typename aux::result_of0<DefaultFn>::type
+  >::type type;
+};
+
+
+}} // namespace boost::parameter
+
+#endif // BOOST_PARAMETER_BINDING_DWA200558_HPP