williamr@2: 
williamr@2: #ifndef BOOST_MPL_AUX_PUSH_FRONT_IMPL_HPP_INCLUDED
williamr@2: #define BOOST_MPL_AUX_PUSH_FRONT_IMPL_HPP_INCLUDED
williamr@2: 
williamr@2: // Copyright Aleksey Gurtovoy 2000-2004
williamr@2: //
williamr@2: // Distributed under the Boost Software License, Version 1.0. 
williamr@2: // (See accompanying file LICENSE_1_0.txt or copy at 
williamr@2: // http://www.boost.org/LICENSE_1_0.txt)
williamr@2: //
williamr@2: // See http://www.boost.org/libs/mpl for documentation.
williamr@2: 
williamr@2: // $Source: /cvsroot/boost/boost/boost/mpl/aux_/push_front_impl.hpp,v $
williamr@2: // $Date: 2004/09/02 15:40:44 $
williamr@2: // $Revision: 1.4 $
williamr@2: 
williamr@2: #include <boost/mpl/push_front_fwd.hpp>
williamr@2: #include <boost/mpl/aux_/has_type.hpp>
williamr@2: #include <boost/mpl/aux_/traits_lambda_spec.hpp>
williamr@2: #include <boost/mpl/aux_/config/forwarding.hpp>
williamr@2: #include <boost/mpl/aux_/config/static_constant.hpp>
williamr@2: 
williamr@2: namespace boost { namespace mpl {
williamr@2: 
williamr@2: // agurt 05/feb/04: no default implementation; the stub definition is needed 
williamr@2: // to enable the default 'has_push_front' implementation below
williamr@2: 
williamr@2: template< typename Tag >
williamr@2: struct push_front_impl
williamr@2: {
williamr@2:     template< typename Sequence, typename T > struct apply {};
williamr@2: };
williamr@2: 
williamr@2: template< typename Tag >
williamr@2: struct has_push_front_impl
williamr@2: {
williamr@2:     template< typename Seq > struct apply
williamr@2: #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
williamr@2:         : aux::has_type< push_front<Seq,int> >
williamr@2:     {
williamr@2: #else
williamr@2:     {
williamr@2:         typedef aux::has_type< push_front<Seq,int> > type;
williamr@2:         BOOST_STATIC_CONSTANT(bool, value = 
williamr@2:               (aux::has_type< push_front<Seq,int> >::value)
williamr@2:             );
williamr@2: #endif
williamr@2:     };
williamr@2: };
williamr@2: 
williamr@2: BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(2, push_front_impl)
williamr@2: BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1, has_push_front_impl)
williamr@2: 
williamr@2: }}
williamr@2: 
williamr@2: #endif // BOOST_MPL_AUX_PUSH_FRONT_IMPL_HPP_INCLUDED