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+// (C) Copyright David Abrahams 2001.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// See http://www.boost.org for most recent version including documentation.
+
+// Revision History
+// 09 Feb 01  Applied John Maddock's Borland patch Moving <true>
+//            specialization to unspecialized template (David Abrahams)
+// 06 Feb 01  Created (David Abrahams)
+
+#ifndef SELECT_TYPE_DWA20010206_HPP
+# define SELECT_TYPE_DWA20010206_HPP
+
+namespace boost { namespace detail {
+
+  // Template class if_true -- select among 2 types based on a bool constant expression
+  // Usage:
+  //   typename if_true<(bool_const_expression)>::template then<true_type, false_type>::type
+
+  // HP aCC cannot deal with missing names for template value parameters
+  template <bool b> struct if_true
+  {
+      template <class T, class F>
+      struct then { typedef T type; };
+  };
+
+  template <>
+  struct if_true<false>
+  {
+      template <class T, class F>
+      struct then { typedef F type; };
+  };
+}}
+#endif // SELECT_TYPE_DWA20010206_HPP