add support for tagged lambda invocations

[SVN r19417]

include/boost/mpl/lambda_fwd.hpp

@@ -1,9 +1,11 @@
-//-----------------------------------------------------------------------------
-// boost mpl/labmda_fwd.hpp header file
-// See http://www.boost.org for updates, documentation, and revision history.
-//-----------------------------------------------------------------------------
-//
-// Copyright (c) 2001-02
+
+#ifndef BOOST_MPL_LAMBDA_FWD_HPP_INCLUDED
+#define BOOST_MPL_LAMBDA_FWD_HPP_INCLUDED
+
+// + file: boost/mpl/labmda_fwd.hpp
+// + last modified: 02/aug/03
+
+// Copyright (c) 2001-03
 // Aleksey Gurtovoy
 //
 // Permission to use, copy, modify, distribute and sell this software
@@ -13,9 +15,8 @@
 // supporting documentation. No representations are made about the 
 // suitability of this software for any purpose. It is provided "as is" 
 // without express or implied warranty.
-
-#ifndef BOOST_MPL_LAMBDA_FWD_HPP_INCLUDED
-#define BOOST_MPL_LAMBDA_FWD_HPP_INCLUDED
+//
+// See http://www.boost.org/libs/mpl for documentation.
 
 #include "boost/mpl/aux_/lambda_arity_param.hpp"
 #include "boost/mpl/aux_/config/lambda.hpp"
@@ -24,10 +25,23 @@ namespace boost {
 namespace mpl {
 
 #if !defined(BOOST_MPL_NO_FULL_LAMBDA_SUPPORT)
-template< typename T BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(typename Arity) >
+
+template< 
+      typename T
+    , typename Tag
+    BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(typename Arity)
+    >
 struct lambda;
+
 #else
-template< typename T, bool Protect > struct lambda;
+
+template< 
+      typename T
+    , typename Tag
+    , bool Protect
+    > 
+struct lambda;
+
 #endif
 
 } // namespace mpl