You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
117 lines
2.5 KiB
117 lines
2.5 KiB
|
|
#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.
|
|
|
|
// $Id$
|
|
// $Date$
|
|
// $Revision$
|
|
|
|
#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(BOOST_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
|