// last_value function object (documented as part of Boost.Signals)
-//
-// Copyright (C) 2001 Doug Gregor (gregod@cs.rpi.edu)
-//
-// Permission to copy, use, sell and distribute this software is granted
-// provided this copyright notice appears in all copies.
-// Permission to modify the code and to distribute modified code is granted
-// provided this copyright notice appears in all copies, and a notice
-// that the code was modified is included with the copyright notice.
-//
-// This software is provided "as is" without express or implied warranty,
-// and with no claim as to its suitability for any purpose.
-
-// For more information, see http://www.boost.org
+
+// Copyright Douglas Gregor 2001-2003. Use, modification and
+// distribution is subject to 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)
+
+// For more information, see http://www.boost.org/libs/signals
#ifndef BOOST_LAST_VALUE_HPP
#define BOOST_LAST_VALUE_HPP
#include <cassert>
+#include <boost/config.hpp>
namespace boost {
template<typename T>
struct last_value {
typedef T result_type;
-
+
template<typename InputIterator>
T operator()(InputIterator first, InputIterator last) const
{
return value;
}
};
-
+
template<>
- class last_value<void> {
+ struct last_value<void> {
+#ifdef BOOST_NO_VOID_RETURNS
struct unusable {};
public:
typedef unusable result_type;
-
+#else
+ public:
+ typedef void result_type;
+#endif // BOOST_NO_VOID_RETURNS
+
template<typename InputIterator>
result_type
operator()(InputIterator first, InputIterator last) const