sl@0: 
sl@0: #ifndef BOOST_MPL_VOID_HPP_INCLUDED
sl@0: #define BOOST_MPL_VOID_HPP_INCLUDED
sl@0: 
sl@0: // Copyright Aleksey Gurtovoy 2001-2004
sl@0: //
sl@0: // Distributed under the Boost Software License, Version 1.0. 
sl@0: // (See accompanying file LICENSE_1_0.txt or copy at 
sl@0: // http://www.boost.org/LICENSE_1_0.txt)
sl@0: //
sl@0: // See http://www.boost.org/libs/mpl for documentation.
sl@0: 
sl@0: // $Source: /cvsroot/boost/boost/boost/mpl/void.hpp,v $
sl@0: // $Date: 2004/09/02 15:40:42 $
sl@0: // $Revision: 1.9 $
sl@0: 
sl@0: #include <boost/mpl/void_fwd.hpp>
sl@0: #include <boost/mpl/bool.hpp>
sl@0: #include <boost/mpl/aux_/na_spec.hpp>
sl@0: #include <boost/mpl/aux_/config/msvc.hpp>
sl@0: #include <boost/mpl/aux_/config/workaround.hpp>
sl@0: 
sl@0: BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_OPEN
sl@0: 
sl@0: //  [JDG Feb-4-2003] made void_ a complete type to allow it to be
sl@0: //  instantiated so that it can be passed in as an object that can be
sl@0: //  used to select an overloaded function. Possible use includes signaling
sl@0: //  a zero arity functor evaluation call.
sl@0: struct void_ { typedef void_ type; };
sl@0: 
sl@0: BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_CLOSE
sl@0: 
sl@0: namespace boost { namespace mpl {
sl@0: 
sl@0: template< typename T >
sl@0: struct is_void_
sl@0:     : false_
sl@0: {
sl@0: #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
sl@0:     using false_::value;
sl@0: #endif
sl@0: };
sl@0: 
sl@0: template<>
sl@0: struct is_void_<void_>
sl@0:     : true_
sl@0: {
sl@0: #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
sl@0:     using true_::value;
sl@0: #endif
sl@0: };
sl@0: 
sl@0: template< typename T >
sl@0: struct is_not_void_
sl@0:     : true_
sl@0: {
sl@0: #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
sl@0:     using true_::value;
sl@0: #endif
sl@0: };
sl@0: 
sl@0: template<>
sl@0: struct is_not_void_<void_>
sl@0:     : false_
sl@0: {
sl@0: #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
sl@0:     using false_::value;
sl@0: #endif
sl@0: };
sl@0: 
sl@0: BOOST_MPL_AUX_NA_SPEC(1, is_void_)
sl@0: BOOST_MPL_AUX_NA_SPEC(1, is_not_void_)
sl@0: 
sl@0: }}
sl@0: 
sl@0: #endif // BOOST_MPL_VOID_HPP_INCLUDED