Aleksey,

I've just been trying the new version of mpl on Digital Mars. The 
attached patch fixes the bug that sometimes causes mpl::if_ to fail. The 
problem is that the class template gets redeclared with different 
parameter names by bind.hpp, and this confuses the compiler. When it 
instantiates the class, it uses the wrong names. The fix is just to make 
sure bind.hpp is included before mpl::if_ is defined.

thanks,

Daniel

Index: boost/mpl/if.hpp
===================================================================
RCS file: /cvsroot/boost/boost/boost/mpl/if.hpp,v
retrieving revision 1.23
diff -u -r1.23 if.hpp
--- boost/mpl/if.hpp	2 Sep 2004 15:40:41 -0000	1.23
+++ boost/mpl/if.hpp	4 Sep 2004 10:54:28 -0000
@@ -14,6 +14,11 @@
 // $Date: 2004/09/02 15:40:41 $
 // $Revision: 1.23 $

+#include <boost/mpl/aux_/config/workaround.hpp>
+#if BOOST_WORKAROUND(__DMC__, BOOST_TESTED_AT(0x840))
+#   include <boost/mpl/bind.hpp>
+#endif
+
 #include <boost/mpl/aux_/value_wknd.hpp>
 #include <boost/mpl/aux_/static_cast.hpp>
 #include <boost/mpl/aux_/na_spec.hpp>

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