#ifndef BOOST_MPL_VECTOR_AUX_AT_HPP_INCLUDED | |
#define BOOST_MPL_VECTOR_AUX_AT_HPP_INCLUDED | |
// Copyright Aleksey Gurtovoy 2000-2004 | |
// | |
// Distributed under 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) | |
// | |
// See http://www.boost.org/libs/mpl for documentation. | |
// $Id: at.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ | |
// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ | |
// $Revision: 49267 $ | |
#include <boost/mpl/at_fwd.hpp> | |
#include <boost/mpl/vector/aux_/tag.hpp> | |
#include <boost/mpl/long.hpp> | |
#include <boost/mpl/void.hpp> | |
#include <boost/mpl/aux_/nttp_decl.hpp> | |
#include <boost/mpl/aux_/type_wrapper.hpp> | |
#include <boost/mpl/aux_/value_wknd.hpp> | |
#include <boost/mpl/aux_/config/typeof.hpp> | |
#include <boost/mpl/aux_/config/ctps.hpp> | |
namespace boost { namespace mpl { | |
#if defined(BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES) | |
template< typename Vector, long n_ > | |
struct v_at_impl | |
{ | |
typedef long_< (Vector::lower_bound_::value + n_) > index_; | |
typedef __typeof__( Vector::item_(index_()) ) type; | |
}; | |
template< typename Vector, long n_ > | |
struct v_at | |
: aux::wrapped_type< typename v_at_impl<Vector,n_>::type > | |
{ | |
}; | |
template<> | |
struct at_impl< aux::vector_tag > | |
{ | |
template< typename Vector, typename N > struct apply | |
: v_at< | |
Vector | |
, BOOST_MPL_AUX_VALUE_WKND(N)::value | |
> | |
{ | |
}; | |
}; | |
#else | |
# if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \ | |
&& !defined(BOOST_MPL_CFG_NO_NONTYPE_TEMPLATE_PARTIAL_SPEC) | |
template< typename Vector, BOOST_MPL_AUX_NTTP_DECL(long, n_) > struct v_at; | |
template< BOOST_MPL_AUX_NTTP_DECL(long, n_) > | |
struct at_impl< aux::vector_tag<n_> > | |
{ | |
template< typename Vector, typename N > struct apply | |
#if !defined(__BORLANDC__) | |
: v_at< | |
Vector | |
, BOOST_MPL_AUX_VALUE_WKND(N)::value | |
> | |
{ | |
#else | |
{ | |
typedef typename v_at< | |
Vector | |
, BOOST_MPL_AUX_VALUE_WKND(N)::value | |
>::type type; | |
#endif | |
}; | |
}; | |
# else | |
namespace aux { | |
template< BOOST_MPL_AUX_NTTP_DECL(long, n_) > struct v_at_impl | |
{ | |
template< typename V > struct result_; | |
}; | |
// to work around ETI, etc. | |
template<> struct v_at_impl<-1> | |
{ | |
template< typename V > struct result_ | |
{ | |
typedef void_ type; | |
}; | |
}; | |
} // namespace aux | |
template< typename T, BOOST_MPL_AUX_NTTP_DECL(long, n_) > | |
struct v_at | |
: aux::v_at_impl<n_>::template result_<T> | |
{ | |
}; | |
# endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION | |
#endif // BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES | |
}} | |
#endif // BOOST_MPL_VECTOR_AUX_AT_HPP_INCLUDED |