[Boost-commit] svn:boost r50493 - sandbox/partition_point/boost/partition_point/detail

Subject: [Boost-commit] svn:boost r50493 - sandbox/partition_point/boost/partition_point/detail
From: aschoedl_at_[hidden]
Date: 2009-01-06 05:17:17

Author: schoedl
Date: 2009-01-06 05:17:17 EST (Tue, 06 Jan 2009)
New Revision: 50493
URL: http://svn.boost.org/trac/boost/changeset/50493

Log:
added fall-back for BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION 
Text files modified: 
   sandbox/partition_point/boost/partition_point/detail/lazy_typedef.hpp |    21 +++++++++++++++------                   
   1 files changed, 15 insertions(+), 6 deletions(-)

Modified: sandbox/partition_point/boost/partition_point/detail/lazy_typedef.hpp
==============================================================================
--- sandbox/partition_point/boost/partition_point/detail/lazy_typedef.hpp	(original)
+++ sandbox/partition_point/boost/partition_point/detail/lazy_typedef.hpp	2009-01-06 05:17:17 EST (Tue, 06 Jan 2009)
@@ -7,9 +7,7 @@
 
 #include <boost/config.hpp>
 
-#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
-#error lazy_typedef.hpp requires partial template specialization!
-#endif
+#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION // required for lazy_typedef to work as intended
 
 namespace boost {
         namespace detail {
@@ -17,8 +15,8 @@
         }
 }
 
-// Defines extract_some_typedef<T> which exposes T::some_typedef as extract_some_typedef<T>::type
-// if T::some_typedef exists. Otherwise extract_some_typedef<T> is empty.
+// Defines lazy_typedef_[some_typedef]<T> which exposes T::[some_typedef] as lazy_typedef_[some_typedef]<T>::type
+// if T::[some_typedef] exists. Otherwise lazy_typedef_[some_typedef]<T> is empty.
 #define BOOST_DECLARE_LAZY_TYPEDEF( some_typedef )                                                     \
         template< typename C, typename Enable=void >                                                       \
         struct lazy_typedef_ ## some_typedef                                                               \
@@ -30,4 +28,15 @@
                 typedef BOOST_DEDUCED_TYPENAME C::some_typedef type;                                           \
         };
 
-#endif // BOOST_PARTITION_POINT_LAZY_TYPEDEF_HPP
\ No newline at end of file
+#else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+
+#define BOOST_DECLARE_LAZY_TYPEDEF( some_typedef )                                                     \
+	template< typename C >                                                                             \
+	struct lazy_typedef_ ## some_typedef                                                               \
+	{                                                                                                  \
+		typedef BOOST_DEDUCED_TYPENAME C::some_typedef type;                                           \
+	};
+
+#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+
+#endif // BOOST_PARTITION_POINT_LAZY_TYPEDEF_HPP