boost/mpl/apply.hpp
//-----------------------------------------------------------------------------
// boost mpl/apply.hpp header file
// See http://www.boost.org for updates, documentation, and revision history.
//-----------------------------------------------------------------------------
//
// Copyright (c) 2000-03
// Aleksey Gurtovoy
//
// Permission to use, copy, modify, distribute and sell this software
// and its documentation for any purpose is hereby granted without fee,
// provided that the above copyright notice appears in all copies and
// that both the copyright notice and this permission notice appear in
// supporting documentation. No representations are made about the
// suitability of this software for any purpose. It is provided "as is"
// without express or implied warranty.
#if !defined(BOOST_PP_IS_ITERATING)
///// header body
#ifndef BOOST_MPL_APPLY_HPP_INCLUDED
#define BOOST_MPL_APPLY_HPP_INCLUDED
#if !defined(BOOST_MPL_PREPROCESSING_MODE)
# include "boost/mpl/arg_fwd.hpp"
# include "boost/mpl/void.hpp"
# include "boost/mpl/aux_/arity.hpp"
# include "boost/mpl/aux_/msvc_never_true.hpp"
# include "boost/type_traits/same_traits.hpp"
#endif
#include "boost/mpl/aux_/config/use_preprocessed.hpp"
#if !defined(BOOST_MPL_NO_PREPROCESSED_HEADERS) \
&& !defined(BOOST_MPL_PREPROCESSING_MODE)
# define BOOST_MPL_PREPROCESSED_HEADER apply.hpp
# include "boost/mpl/aux_/include_preprocessed.hpp"
#else
# include "boost/mpl/limits/arity.hpp"
# include "boost/mpl/aux_/lambda_support.hpp"
# include "boost/mpl/aux_/preprocessor/params.hpp"
# include "boost/mpl/aux_/preprocessor/default_params.hpp"
# include "boost/mpl/aux_/preprocessor/partial_spec_params.hpp"
# include "boost/mpl/aux_/preprocessor/enum.hpp"
# include "boost/mpl/aux_/preprocessor/add.hpp"
# include "boost/mpl/aux_/config/dtp.hpp"
# include "boost/mpl/aux_/config/nttp.hpp"
# include "boost/mpl/aux_/config/eti.hpp"
# include "boost/mpl/aux_/config/lambda.hpp"
# include "boost/preprocessor/comma_if.hpp"
# include "boost/preprocessor/inc.hpp"
# include "boost/preprocessor/iterate.hpp"
# include "boost/config.hpp"
// agurt, 15/jan/02: top-level 'apply' template gives an ICE on MSVC
// (for known reasons)
#if defined(BOOST_MSVC) && (BOOST_MSVC <= 1200)
# define BOOST_MPL_NO_APPLY_TEMPLATE
#endif
namespace boost {
namespace mpl {
// local macros, #undef-ined at the end of the header
# define AUX_APPLY_PARAMS(param) \
BOOST_MPL_PP_PARAMS( \
BOOST_MPL_METAFUNCTION_MAX_ARITY \
, param \
) \
/**/
# define AUX_APPLY_DEFAULT_PARAMS(param, value) \
BOOST_MPL_PP_DEFAULT_PARAMS( \
BOOST_MPL_METAFUNCTION_MAX_ARITY \
, param \
, value \
) \
/**/
# define AUX_APPLY_N_PARAMS(n, param) \
BOOST_MPL_PP_PARAMS(n, param) \
/**/
# define AUX_APPLY_N_COMMA_PARAMS(n, param) \
BOOST_PP_COMMA_IF(n) \
BOOST_MPL_PP_PARAMS(n, param) \
/**/
# define AUX_APPLY_N_PARTIAL_SPEC_PARAMS(n, param, def) \
BOOST_PP_COMMA_IF(n) \
BOOST_MPL_PP_PARTIAL_SPEC_PARAMS(n, param, def) \
/**/
# define AUX_APPLY_N_SPEC_PARAMS(n, param) \
BOOST_MPL_PP_ENUM(BOOST_PP_INC(n), param) \
/**/
# if !defined(BOOST_MPL_NO_APPLY_TEMPLATE)
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
// forward declaration
template<
typename F, AUX_APPLY_DEFAULT_PARAMS(typename T, void_)
>
struct apply;
#else
namespace aux {
template< BOOST_MPL_AUX_NTTP_DECL(int, arity_) > struct apply_impl_chooser;
}
#endif
# endif // BOOST_MPL_NO_APPLY_TEMPLATE
#define BOOST_PP_ITERATION_PARAMS_1 \
(3,(0, BOOST_MPL_METAFUNCTION_MAX_ARITY, "boost/mpl/apply.hpp"))
#include BOOST_PP_ITERATE()
# if !defined(BOOST_MPL_NO_APPLY_TEMPLATE)
// real C++ version is already taken care of
# if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
namespace aux {
// apply_count_args
#define BOOST_MPL_AUX_COUNT_ARGS_PREFIX apply
#define BOOST_MPL_AUX_COUNT_ARGS_DEFAULT void_
#define BOOST_MPL_AUX_COUNT_ARGS_ARITY BOOST_MPL_METAFUNCTION_MAX_ARITY
#include "boost/mpl/aux_/count_args.hpp"
} // namespace aux
template<
typename F, AUX_APPLY_DEFAULT_PARAMS(typename T, void_)
>
struct apply
: aux::apply_impl_chooser<
aux::apply_count_args< AUX_APPLY_PARAMS(T) >::value
>::template result_< F, AUX_APPLY_PARAMS(T) >::type
{
};
# endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
# endif // BOOST_MPL_NO_APPLY_TEMPLATE
# undef AUX_APPLY_N_SPEC_PARAMS
# undef AUX_APPLY_N_PARTIAL_SPEC_PARAMS
# undef AUX_APPLY_N_COMMA_PARAMS
# undef AUX_APPLY_N_PARAMS
# undef AUX_APPLY_DEFAULT_PARAMS
# undef AUX_APPLY_PARAMS
} // namespace mpl
} // namespace boost
#endif // BOOST_MPL_USE_PREPROCESSED_HEADERS
#endif // BOOST_MPL_APPLY_HPP_INCLUDED
///// iteration, depth == 1
#elif BOOST_PP_ITERATION_DEPTH() == 1
# define i BOOST_PP_FRAME_ITERATION(1)
# if i == 0
template< typename F >
struct apply0 : F
{
BOOST_MPL_AUX_LAMBDA_SUPPORT(1, apply0, (F))
};
#if defined(BOOST_MPL_MSVC_ETI_BUG)
//: workaround for the ETI bug
template<>
struct apply0<int>
{
typedef int type;
};
#endif
# else // i > 0
# if defined(BOOST_MSVC) && (BOOST_MSVC < 1300)
// MSVC version
namespace aux {
// msvc_apply##i
#define BOOST_MPL_AUX_MSVC_DTW_NAME BOOST_PP_CAT(msvc_apply,i)
#define BOOST_MPL_AUX_MSVC_DTW_ORIGINAL_NAME apply
#define BOOST_MPL_AUX_MSVC_DTW_ARITY i
#include "boost/mpl/aux_/msvc_dtw.hpp"
} // namespace aux
template<
typename F, AUX_APPLY_N_PARAMS(i, typename T)
>
struct BOOST_PP_CAT(apply,i)
{
// Metafunction forwarding confuses vc6
typedef typename BOOST_PP_CAT(aux::msvc_apply,i)<F>::template result_<
AUX_APPLY_N_PARAMS(i, T)
>::type type;
BOOST_MPL_AUX_LAMBDA_SUPPORT(
BOOST_PP_INC(i)
, BOOST_PP_CAT(apply,i)
, (F, AUX_APPLY_N_PARAMS(i,T))
)
};
# elif defined(BOOST_BROKEN_DEFAULT_TEMPLATE_PARAMETERS_IN_NESTED_TEMPLATES)
// MWCW/Borland version
namespace aux {
template<
int N, typename F, AUX_APPLY_N_PARAMS(i, typename T)
>
struct BOOST_PP_CAT(apply_impl,i);
}
#define BOOST_PP_ITERATION_PARAMS_2 \
(3,(0, BOOST_MPL_METAFUNCTION_MAX_ARITY - i, "boost/mpl/apply.hpp"))
#include BOOST_PP_ITERATE()
template<
typename F, AUX_APPLY_N_PARAMS(i, typename T)
>
struct BOOST_PP_CAT(apply,i)
: BOOST_PP_CAT(aux::apply_impl,i)<
::boost::mpl::aux::arity<F,i>::value
, F
, AUX_APPLY_N_PARAMS(i, T)
>::type
{
BOOST_MPL_AUX_LAMBDA_SUPPORT(
BOOST_PP_INC(i)
, BOOST_PP_CAT(apply,i)
, (F, AUX_APPLY_N_PARAMS(i,T))
)
};
# else
// ISO98 C++, with minor concession to vc7
template<
typename F, AUX_APPLY_N_PARAMS(i, typename T)
>
struct BOOST_PP_CAT(apply,i)
{
// Metafunction forwarding confuses vc7
typedef typename F::template apply<
AUX_APPLY_N_PARAMS(i, T)
>::type type;
BOOST_MPL_AUX_LAMBDA_SUPPORT(
BOOST_PP_INC(i)
, BOOST_PP_CAT(apply,i)
, (F, AUX_APPLY_N_PARAMS(i,T))
)
};
# endif // workarounds
#if defined(BOOST_MPL_MSVC_ETI_BUG)
//: workaround for ETI bug
template<>
struct BOOST_PP_CAT(apply,i)<AUX_APPLY_N_SPEC_PARAMS(i, int)>
{
typedef int type;
};
#endif
# endif // i > 0
# if !defined(BOOST_MPL_NO_APPLY_TEMPLATE)
# if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
#if i == BOOST_MPL_METAFUNCTION_MAX_ARITY
//: primary template (not a specialization!)
template<
typename F AUX_APPLY_N_COMMA_PARAMS(i, typename T)
>
struct apply
: BOOST_PP_CAT(apply,i)< F AUX_APPLY_N_COMMA_PARAMS(i, T) >
{
};
#else
template<
typename F AUX_APPLY_N_COMMA_PARAMS(i, typename T)
>
struct apply< F AUX_APPLY_N_PARTIAL_SPEC_PARAMS(i, T, void_) >
: BOOST_PP_CAT(apply,i)< F AUX_APPLY_N_COMMA_PARAMS(i, T) >
{
};
#endif // i == BOOST_MPL_METAFUNCTION_MAX_ARITY
# else
namespace aux {
template<>
struct apply_impl_chooser<i>
{
template<
typename F, AUX_APPLY_PARAMS(typename T)
>
struct result_
{
typedef BOOST_PP_CAT(apply,i)<
F AUX_APPLY_N_COMMA_PARAMS(i, T)
> type;
};
};
} // namespace aux
# endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
# endif // BOOST_MPL_NO_APPLY_TEMPLATE
# undef i
///// iteration, depth == 2
#elif BOOST_PP_ITERATION_DEPTH() == 2
# define j BOOST_PP_FRAME_ITERATION(2)
namespace aux {
template<
typename F, AUX_APPLY_N_PARAMS(i, typename T)
>
struct BOOST_PP_CAT(apply_impl,i)<
BOOST_MPL_PP_ADD(i, j)
, F
, AUX_APPLY_N_PARAMS(i, T)
>
{
typedef typename F::template apply<
AUX_APPLY_N_PARAMS(i, T)
BOOST_PP_COMMA_IF(j) BOOST_MPL_PP_ENUM(j, void_)
> type;
};
} // namespace aux
# undef j
#endif // BOOST_PP_IS_ITERATING