type_traits (__add_lvalue_reference_helper, [...]): As an optimization, rewrite…

type_traits (__add_lvalue_reference_helper, [...]): As an optimization, rewrite condition (avoid is_function).

2009-03-14  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/std/type_traits (__add_lvalue_reference_helper,
	__add_rvalue_reference_helper): As an optimization, rewrite
	condition (avoid is_function).

From-SVN: r144868

libstdc++-v3/ChangeLog

+2009-03-14  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	* include/std/type_traits (__add_lvalue_reference_helper,
+	__add_rvalue_reference_helper): As an optimization, rewrite
+	condition (avoid is_function).
+
 2009-03-13  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR libstdc++/39405

libstdc++-v3/include/std/type_traits

@@ -111,7 +111,7 @@ namespace std
     { typedef _Tp   type; };
 
   template<typename _Tp,
-	   bool = is_object<_Tp>::value || is_function<_Tp>::value,
+	   bool = !is_reference<_Tp>::value && !is_void<_Tp>::value,
 	   bool = is_rvalue_reference<_Tp>::value>
     struct __add_lvalue_reference_helper
     { typedef _Tp   type; };
@@ -131,7 +131,7 @@ namespace std
     { };
 
   template<typename _Tp,
-	   bool = is_object<_Tp>::value || is_function<_Tp>::value>
+	   bool = !is_reference<_Tp>::value && !is_void<_Tp>::value>
     struct __add_rvalue_reference_helper
     { typedef _Tp   type; };