[Lemon-commits] deba: r3262 - lemon/trunk/lemon/bits

[Lemon SVN]

Author: deba
Date: Thu Apr 19 17:12:59 2007
New Revision: 3262

Modified:
   lemon/trunk/lemon/bits/utility.h

Log:
Helper classs for checking existence of a nested class



Modified: lemon/trunk/lemon/bits/utility.h
==============================================================================
--- lemon/trunk/lemon/bits/utility.h	(original)
+++ lemon/trunk/lemon/bits/utility.h	Thu Apr 19 17:12:59 2007
@@ -83,6 +83,12 @@
   template<int T> struct dummy { dummy(int) {} };
 
   /**************** enable_if from BOOST ****************/
+  
+  template <typename Type, typename T = void>
+  struct exists {
+    typedef T type;
+  };
+
  
   template <bool B, class T = void>
   struct enable_if_c {