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#if !defined(BOOST_PP_IS_ITERATING)
///// header body
//-----------------------------------------------------------------------------
// boost variant/detail/substitute.hpp header file
// See http://www.boost.org for updates, documentation, and revision history.
//-----------------------------------------------------------------------------
//
// Copyright (c) 2003
// Eric Friedman
//
// 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)
#ifndef BOOST_VARIANT_DETAIL_SUBSTITUTE_HPP
#define BOOST_VARIANT_DETAIL_SUBSTITUTE_HPP
#include <boost/mpl/aux_/config/ctps.hpp>
#include <boost/variant/detail/substitute_fwd.hpp>
#include <boost/variant/variant_fwd.hpp> // for BOOST_VARIANT_DO_NOT_USE_VARIADIC_TEMPLATES
#include <boost/mpl/aux_/lambda_arity_param.hpp>
#include <boost/mpl/aux_/preprocessor/params.hpp>
#include <boost/mpl/aux_/preprocessor/repeat.hpp>
#include <boost/mpl/int_fwd.hpp>
#include <boost/mpl/limits/arity.hpp>
#include <boost/preprocessor/cat.hpp>
#include <boost/preprocessor/empty.hpp>
#include <boost/preprocessor/arithmetic/inc.hpp>
#include <boost/preprocessor/iterate.hpp>
namespace boost {
namespace detail { namespace variant {
#if !defined(BOOST_VARIANT_DETAIL_NO_SUBSTITUTE)
///////////////////////////////////////////////////////////////////////////////
// (detail) metafunction substitute
//
// Substitutes one type for another in the given type expression.
//
//
// primary template
//
template <
typename T, typename Dest, typename Source
BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(
typename Arity /* = ... (see substitute_fwd.hpp) */
)
>
struct substitute
{
typedef T type;
};
//
// tag substitution specializations
//
#define BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_SUBSTITUTE_TAG(CV_) \
template <typename Dest, typename Source> \
struct substitute< \
CV_ Source \
, Dest \
, Source \
BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(mpl::int_<-1>) \
> \
{ \
typedef CV_ Dest type; \
}; \
/**/
BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_SUBSTITUTE_TAG( BOOST_PP_EMPTY() )
BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_SUBSTITUTE_TAG(const)
BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_SUBSTITUTE_TAG(volatile)
BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_SUBSTITUTE_TAG(const volatile)
#undef BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_SUBSTITUTE_TAG
//
// pointer specializations
//
#define BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_HANDLE_POINTER(CV_) \
template <typename T, typename Dest, typename Source> \
struct substitute< \
T * CV_ \
, Dest \
, Source \
BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(mpl::int_<-1>) \
> \
{ \
typedef typename substitute< \
T, Dest, Source \
>::type * CV_ type; \
}; \
/**/
BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_HANDLE_POINTER( BOOST_PP_EMPTY() )
BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_HANDLE_POINTER(const)
BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_HANDLE_POINTER(volatile)
BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_HANDLE_POINTER(const volatile)
#undef BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_HANDLE_POINTER
//
// reference specializations
//
template <typename T, typename Dest, typename Source>
struct substitute<
T&
, Dest
, Source
BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(mpl::int_<-1>)
>
{
typedef typename substitute<
T, Dest, Source
>::type & type;
};
//
// template expression (i.e., F<...>) specializations
//
#if !defined(BOOST_VARIANT_DO_NOT_USE_VARIADIC_TEMPLATES)
template <
template <typename...> class F
, typename... Ts
, typename Dest
, typename Source
BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(typename Arity)
>
struct substitute<
F<Ts...>
, Dest
, Source
BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(Arity)
>
{
typedef F<typename substitute<
Ts, Dest, Source
>::type...> type;
};
//
// function specializations
//
template <
typename R
, typename... A
, typename Dest
, typename Source
>
struct substitute<
R (*)(A...)
, Dest
, Source
BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(mpl::int_<-1>)
>
{
private:
typedef typename substitute< R, Dest, Source >::type r;
public:
typedef r (*type)(typename substitute<
A, Dest, Source
>::type...);
};
#else
#define BOOST_VARIANT_AUX_SUBSTITUTE_TYPEDEF_IMPL(N) \
typedef typename substitute< \
BOOST_PP_CAT(U,N), Dest, Source \
>::type BOOST_PP_CAT(u,N); \
/**/
#define BOOST_VARIANT_AUX_SUBSTITUTE_TYPEDEF(z, N, _) \
BOOST_VARIANT_AUX_SUBSTITUTE_TYPEDEF_IMPL( BOOST_PP_INC(N) ) \
/**/
#define BOOST_PP_ITERATION_LIMITS (0,BOOST_MPL_LIMIT_METAFUNCTION_ARITY)
#define BOOST_PP_FILENAME_1 <boost/variant/detail/substitute.hpp>
#include BOOST_PP_ITERATE()
#undef BOOST_VARIANT_AUX_SUBSTITUTE_TYPEDEF_IMPL
#undef BOOST_VARIANT_AUX_SUBSTITUTE_TYPEDEF
#endif // !defined(BOOST_VARIANT_DO_NOT_USE_VARIADIC_TEMPLATES)
#endif // !defined(BOOST_VARIANT_DETAIL_NO_SUBSTITUTE)
}} // namespace detail::variant
} // namespace boost
#endif // BOOST_VARIANT_DETAIL_SUBSTITUTE_HPP
///// iteration, depth == 1
#elif BOOST_PP_ITERATION_DEPTH() == 1
#define i BOOST_PP_FRAME_ITERATION(1)
#if i > 0
//
// template specializations
//
template <
template < BOOST_MPL_PP_PARAMS(i,typename P) > class T
, BOOST_MPL_PP_PARAMS(i,typename U)
, typename Dest
, typename Source
>
struct substitute<
T< BOOST_MPL_PP_PARAMS(i,U) >
, Dest
, Source
BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(mpl::int_<( i )>)
>
{
private:
BOOST_MPL_PP_REPEAT(i, BOOST_VARIANT_AUX_SUBSTITUTE_TYPEDEF, _)
public:
typedef T< BOOST_MPL_PP_PARAMS(i,u) > type;
};
//
// function specializations
//
template <
typename R
, BOOST_MPL_PP_PARAMS(i,typename U)
, typename Dest
, typename Source
>
struct substitute<
R (*)( BOOST_MPL_PP_PARAMS(i,U) )
, Dest
, Source
BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(mpl::int_<-1>)
>
{
private:
typedef typename substitute< R, Dest, Source >::type r;
BOOST_MPL_PP_REPEAT(i, BOOST_VARIANT_AUX_SUBSTITUTE_TYPEDEF, _)
public:
typedef r (*type)( BOOST_MPL_PP_PARAMS(i,u) );
};
#elif i == 0
//
// zero-arg function specialization
//
template <
typename R, typename Dest, typename Source
>
struct substitute<
R (*)( void )
, Dest
, Source
BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(mpl::int_<-1>)
>
{
private:
typedef typename substitute< R, Dest, Source >::type r;
public:
typedef r (*type)( void );
};
#endif // i
#undef i
#endif // BOOST_PP_IS_ITERATING
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