mpl/aux_/fold_op.hpp

0001
0002 #ifndef BOOST_MPL_AUX_FOLD_OP_HPP_INCLUDED
0003 #define BOOST_MPL_AUX_FOLD_OP_HPP_INCLUDED
0004
0005 // Copyright Aleksey Gurtovoy 2001-2004
0006 //
0007 // Distributed under the Boost Software License, Version 1.0.
0008 // (See accompanying file LICENSE_1_0.txt or copy at
0009 // http://www.boost.org/LICENSE_1_0.txt)
0010 //
0011 // See http://www.boost.org/libs/mpl for documentation.
0012
0013 // $Id$
0014 // $Date$
0015 // $Revision$
0016
0017 #include <boost/mpl/apply.hpp>
0018
0019 namespace boost { namespace mpl { namespace aux {
0020
0021 // hand-written version is more efficient than bind/lambda expression
0022 template< typename Op >
0023 struct fold_op
0024 {
0025     template< typename T1, typename T2 > struct apply
0026     {
0027         typedef typename apply2<
0028               Op
0029             , T1
0030             , typename T2::type
0031             >::type type;
0032     };
0033 };
0034
0035 }}}
0036
0037 #endif // BOOST_MPL_AUX_FOLD_OP_HPP_INCLUDED