1 #ifndef BOOST_IS_PLACEHOLDER_HPP_INCLUDED 2 #define BOOST_IS_PLACEHOLDER_HPP_INCLUDED 3 4 // MS compatible compilers support #pragma once 5 6 #if defined( _MSC_VER ) && ( _MSC_VER >= 1020 ) 7 # pragma once 8 #endif 9 10 11 // is_placeholder.hpp - TR1 is_placeholder metafunction 12 // 13 // Copyright (c) 2006 Peter Dimov 14 // 15 // Distributed under the Boost Software License, Version 1.0. 16 // 17 // See accompanying file LICENSE_1_0.txt or copy at 18 // http://www.boost.org/LICENSE_1_0.txt 19 20 21 namespace boost 22 { 23 24 template< class T > struct is_placeholder 25 { 26 enum _vt { value = 0 }; 27 }; 28 29 } // namespace boost 30 31 #endif // #ifndef BOOST_IS_PLACEHOLDER_HPP_INCLUDED 32