Release 1.51.0

[SVN r80098]

include/boost/none.hpp

@@ -20,7 +20,7 @@
 
 namespace boost {
 
-none_t const none = ((none_t)0) ;
+none_t const none = (static_cast<none_t>(0)) ;
 
 } // namespace boost
 

include/boost/optional/optional_fwd.hpp

@@ -1,4 +1,4 @@
-// Copyright (C) 2003, Fernando Luis Cacciola Carballal.
+// Copyright (C) 2003, 2008 Fernando Luis Cacciola Carballal.
 //
 // Use, modification, and distribution is subject to the Boost Software
 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
@@ -9,6 +9,9 @@
 // You are welcome to contact the author at:
 //  fernando_cacciola@hotmail.com
 //
+// Revisions:
+// 10 May 2008 (added swap related forward declaration) Niels Dekker
+// 
 #ifndef BOOST_OPTIONAL_OPTIONAL_FWD_FLC_19NOV2002_HPP
 #define BOOST_OPTIONAL_OPTIONAL_FWD_FLC_19NOV2002_HPP
 
@@ -16,6 +19,10 @@ namespace boost {
 
 template<class T> class optional ;
 
+template<class T> void swap ( optional<T>& , optional<T>& ) ;
+
+template<class T> struct optional_swap_should_use_default_constructor ;
+
 } // namespace boost
 
 #endif