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[SVN r1402]

include/boost/utility/enable_if.hpp

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+//
+//                               Software License
+//
+//    Copyright 2003 <20> The Trustees of Indiana University.  All rights
+//    reserved.
+//
+//    Redistribution and use in source and binary forms, with or without
+//    modification, are permitted provided that the following conditions are
+//    met:
+//     1. All redistributions of source code must retain the above copyright
+//        notice, the list of authors in the original source code, this list
+//        of conditions and the disclaimer listed in this license;
+//     2. All redistributions in binary form must reproduce the above
+//        copyright notice, this list of conditions and the disclaimer
+//        listed in this license in the documentation and/or other materials
+//        provided with the distribution;
+//     3. Any documentation included with all redistributions must include
+//        the following acknowledgement:
+//
+//
+//    This product includes software developed by the Open Systems Laboratory
+//    at Indiana University.  For further information contact Andrew Lumsdaine
+//    at lums@osl.iu.edu.
+//
+//    Alternatively, this acknowledgement may appear in the software itself,
+//    and wherever such third-party acknowledgments normally appear.
+//
+//     4. The name Indiana University shall not be used to endorse or promote
+//        products derived from this software without prior written permission
+//        from Indiana University.  For written permission, please contact the
+//        Advanced Research and Technology Institute (ARTI) at 1100 Waterway
+//        Blvd., Indianapolis, Indiana 46202.
+//     5. Products derived from this software may not be called enable_if, nor
+//        may Indiana University appear in their name, without prior written
+//        permission of ARTI.
+//
+//
+//
+//    Indiana University provides no reassurances that the source code
+//    provided does not infringe the patent or any other intellectual
+//    property rights of any other entity.  Indiana University disclaims any
+//    liability to any recipient for claims brought by any other entity
+//    based on infringement of intellectual property rights or otherwise.
+//
+//    LICENSEE UNDERSTANDS THAT SOFTWARE IS PROVIDED "AS IS" FOR WHICH
+//    NO WARRANTIES AS TO CAPABILITIES OR ACCURACY ARE MADE. INDIANA
+//    UNIVERSITY GIVES NO WARRANTIES AND MAKES NO REPRESENTATION THAT
+//    SOFTWARE IS FREE OF INFRINGEMENT OF THIRD PARTY PATENT, COPYRIGHT, OR
+//    OTHER PROPRIETARY RIGHTS.  INDIANA UNIVERSITY MAKES NO WARRANTIES THAT
+//    SOFTWARE IS FREE FROM "BUGS", "VIRUSES", "TROJAN HORSES", "TRAP
+//    DOORS", "WORMS", OR OTHER HARMFUL CODE.  LICENSEE ASSUMES THE ENTIRE
+//    RISK AS TO THE PERFORMANCE OF SOFTWARE AND/OR ASSOCIATED MATERIALS,
+//    AND TO THE PERFORMANCE AND VALIDITY OF INFORMATION GENERATED USING
+//    SOFTWARE.
+//
+//
+//    Authors: Jaakko J<>rvi (jajarvi@osl.iu.edu)
+//             Jeremiah Willcock (jewillco@osl.iu.edu)
+//             Andrew Lumsdaine (lums@osl.iu.edu)
+//
+
+#ifndef BOOST_UTILITY_ENABLE_IF_HPP
+#define BOOST_UTILITY_ENABLE_IF_HPP
+
+namespace boost
+{
+ 
+  template <bool B, class T = void>
+  struct enable_if {
+    typedef T type;
+  };
+
+  template <class T>
+  struct enable_if<false, T> {};
+
+
+  template <bool B, class T>
+  struct enable_if_lazy {
+    typedef typename T::type type;
+  };
+
+  template <class T>
+  struct enable_if_lazy<false, T> {};
+
+  template <bool B, class T = void>
+  struct disable_if: public enable_if< !B, T> {};
+
+  template <bool B, class T>
+  struct disable_if_lazy: public enable_if_lazy< !B, T> {};
+  
+} // namespace boost
+
+#endif