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///////////////////////////////////////////////////////////////////////////////
/// \file impl.hpp
/// Contains definition of transform<> and transform_impl<> helpers.
//
// Copyright 2008 Eric Niebler. 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_PROTO_TRANSFORM_IMPL_HPP_EAN_04_03_2008
#define BOOST_PROTO_TRANSFORM_IMPL_HPP_EAN_04_03_2008
#include <boost/proto/proto_fwd.hpp>
namespace boost { namespace proto
{
/// INTERNAL ONLY
///
#define BOOST_PROTO_TRANSFORM_(PrimitiveTransform, X) \
BOOST_PROTO_CALLABLE() \
typedef X proto_is_transform_; \
typedef PrimitiveTransform transform_type; \
\
template<typename Sig> \
struct result \
{ \
typedef typename boost::proto::detail::apply_transform<Sig>::result_type type; \
}; \
\
template<typename Expr> \
typename boost::proto::detail::apply_transform<transform_type(Expr &)>::result_type \
operator ()(Expr &e) const \
{ \
int i = 0; \
return boost::proto::detail::apply_transform<transform_type(Expr &)>()(e, i, i); \
} \
\
template<typename Expr, typename State> \
typename boost::proto::detail::apply_transform<transform_type(Expr &, State &)>::result_type \
operator ()(Expr &e, State &s) const \
{ \
int i = 0; \
return boost::proto::detail::apply_transform<transform_type(Expr &, State &)>()(e, s, i); \
} \
\
template<typename Expr, typename State> \
typename boost::proto::detail::apply_transform<transform_type(Expr &, State const &)>::result_type \
operator ()(Expr &e, State const &s) const \
{ \
int i = 0; \
return boost::proto::detail::apply_transform<transform_type(Expr &, State const &)>()(e, s, i); \
} \
\
template<typename Expr, typename State, typename Data> \
typename boost::proto::detail::apply_transform<transform_type(Expr &, State &, Data &)>::result_type \
operator ()(Expr &e, State &s, Data &d) const \
{ \
return boost::proto::detail::apply_transform<transform_type(Expr &, State &, Data &)>()(e, s, d); \
} \
\
template<typename Expr, typename State, typename Data> \
typename boost::proto::detail::apply_transform<transform_type(Expr &, State const &, Data &)>::result_type \
operator ()(Expr &e, State const &s, Data &d) const \
{ \
return boost::proto::detail::apply_transform<transform_type(Expr &, State const &, Data &)>()(e, s, d); \
} \
/**/
#define BOOST_PROTO_TRANSFORM(PrimitiveTransform) \
BOOST_PROTO_TRANSFORM_(PrimitiveTransform, void) \
/**/
namespace detail
{
template<typename Sig>
struct apply_transform;
template<typename PrimitiveTransform, typename Expr>
struct apply_transform<PrimitiveTransform(Expr)>
: PrimitiveTransform::template impl<Expr, int, int>
{};
template<typename PrimitiveTransform, typename Expr, typename State>
struct apply_transform<PrimitiveTransform(Expr, State)>
: PrimitiveTransform::template impl<Expr, State, int>
{};
template<typename PrimitiveTransform, typename Expr, typename State, typename Data>
struct apply_transform<PrimitiveTransform(Expr, State, Data)>
: PrimitiveTransform::template impl<Expr, State, Data>
{};
}
template<typename PrimitiveTransform, typename X>
struct transform
{
BOOST_PROTO_TRANSFORM_(PrimitiveTransform, X)
};
template<typename Expr, typename State, typename Data>
struct transform_impl
{
typedef Expr const expr;
typedef Expr const &expr_param;
typedef State const state;
typedef State const &state_param;
typedef Data const data;
typedef Data const &data_param;
};
template<typename Expr, typename State, typename Data>
struct transform_impl<Expr &, State, Data>
{
typedef Expr expr;
typedef Expr &expr_param;
typedef State const state;
typedef State const &state_param;
typedef Data const data;
typedef Data const &data_param;
};
template<typename Expr, typename State, typename Data>
struct transform_impl<Expr, State &, Data>
{
typedef Expr const expr;
typedef Expr const &expr_param;
typedef State state;
typedef State &state_param;
typedef Data const data;
typedef Data const &data_param;
};
template<typename Expr, typename State, typename Data>
struct transform_impl<Expr, State, Data &>
{
typedef Expr const expr;
typedef Expr const &expr_param;
typedef State const state;
typedef State const &state_param;
typedef Data data;
typedef Data &data_param;
};
template<typename Expr, typename State, typename Data>
struct transform_impl<Expr &, State &, Data>
{
typedef Expr expr;
typedef Expr &expr_param;
typedef State state;
typedef State &state_param;
typedef Data const data;
typedef Data const &data_param;
};
template<typename Expr, typename State, typename Data>
struct transform_impl<Expr &, State, Data &>
{
typedef Expr expr;
typedef Expr &expr_param;
typedef State const state;
typedef State const &state_param;
typedef Data data;
typedef Data &data_param;
};
template<typename Expr, typename State, typename Data>
struct transform_impl<Expr, State &, Data &>
{
typedef Expr const expr;
typedef Expr const &expr_param;
typedef State state;
typedef State &state_param;
typedef Data data;
typedef Data &data_param;
};
template<typename Expr, typename State, typename Data>
struct transform_impl<Expr &, State &, Data &>
{
typedef Expr expr;
typedef Expr &expr_param;
typedef State state;
typedef State &state_param;
typedef Data data;
typedef Data &data_param;
};
}} // namespace boost::proto
#endif
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Swift