mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-12-25 21:35:41 +00:00
128 lines
3.7 KiB
C++
128 lines
3.7 KiB
C++
#ifndef SPROUT_BREED_TRANSFORM_PASS_THROUGH_HPP
|
|
#define SPROUT_BREED_TRANSFORM_PASS_THROUGH_HPP
|
|
|
|
#include <type_traits>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/index_tuple/metafunction.hpp>
|
|
#include <sprout/breed/breed_fwd.hpp>
|
|
#include <sprout/breed/args.hpp>
|
|
#include <sprout/breed/transform/impl.hpp>
|
|
#include <sprout/breed/detail/std_result_of.hpp>
|
|
|
|
namespace sprout {
|
|
namespace breed {
|
|
namespace detail {
|
|
template<
|
|
typename Grammar,
|
|
typename Expr,
|
|
typename State,
|
|
typename Data,
|
|
long Arity = sprout::breed::arity_of<Expr>::value
|
|
>
|
|
struct pass_through_impl
|
|
: public sprout::breed::transform_impl<Expr, State, Data>
|
|
{
|
|
public:
|
|
typedef typename pass_through_impl::expr unref_expr;
|
|
private:
|
|
template<typename IndexTuple>
|
|
struct list_impl {};
|
|
template<sprout::index_t... Indexes>
|
|
struct list_impl<sprout::index_tuple<Indexes...> > {
|
|
public:
|
|
typedef sprout::breed::list<
|
|
typename Grammar::template breed_child<Indexes>::type::template impl<
|
|
typename sprout::breed::result_of::child_c<Expr, Indexes>::type,
|
|
State,
|
|
Data
|
|
>::result_type...
|
|
> type;
|
|
};
|
|
public:
|
|
typedef typename sprout::breed::base_expr<
|
|
typename unref_expr::breed_domain,
|
|
typename unref_expr::breed_tag,
|
|
typename list_impl<typename sprout::make_index_tuple<Arity>::type>::type
|
|
>::type expr_type;
|
|
typedef typename unref_expr::breed_generator breed_generator;
|
|
typedef typename sprout::breed::detail::std_result_of<
|
|
breed_generator(expr_type)
|
|
>::type result_type;
|
|
private:
|
|
template<sprout::index_t... Indexes>
|
|
SPROUT_CONSTEXPR result_type call_impl(
|
|
typename pass_through_impl::expr_param e,
|
|
typename pass_through_impl::state_param s,
|
|
typename pass_through_impl::data_param d,
|
|
sprout::index_tuple<Indexes...>
|
|
) const
|
|
{
|
|
return breed_generator()(
|
|
expr_type(
|
|
typename Grammar::template breed_child<Indexes>::type::template impl<
|
|
typename sprout::breed::result_of::child_c<Expr, Indexes>::type,
|
|
State,
|
|
Data
|
|
>()(e.proto_base().template child<Indexes>(), s, d)...
|
|
)
|
|
);
|
|
}
|
|
public:
|
|
SPROUT_CONSTEXPR result_type operator()(
|
|
typename pass_through_impl::expr_param e,
|
|
typename pass_through_impl::state_param s,
|
|
typename pass_through_impl::data_param d
|
|
) const
|
|
{
|
|
return call_impl(e, s, d, sprout::make_index_tuple<Arity>::make());
|
|
}
|
|
};
|
|
template<typename Grammar, typename Expr, typename State, typename Data>
|
|
struct pass_through_impl<Grammar, Expr, State, Data, 0>
|
|
: public sprout::breed::transform_impl<Expr, State, Data>
|
|
{
|
|
public:
|
|
typedef Expr result_type;
|
|
public:
|
|
#ifdef SPROUT_BREED_STRICT_RESULT_OF
|
|
SPROUT_CONSTEXPR result_type
|
|
#else
|
|
SPROUT_CONSTEXPR typename pass_through_impl::expr_param
|
|
#endif
|
|
operator()(
|
|
typename pass_through_impl::expr_param e,
|
|
typename pass_through_impl::state_param,
|
|
typename pass_through_impl::data_param
|
|
) const
|
|
{
|
|
return e;
|
|
}
|
|
};
|
|
|
|
} // namespace detail
|
|
|
|
//
|
|
// pass_through
|
|
//
|
|
template<typename Grammar>
|
|
struct pass_through
|
|
: public sprout::breed::transform<sprout::breed::pass_through<Grammar> >
|
|
{
|
|
public:
|
|
template<typename Expr, typename State, typename Data>
|
|
struct impl
|
|
: public sprout::breed::detail::pass_through_impl<Grammar, Expr, State, Data>
|
|
{};
|
|
};
|
|
|
|
//
|
|
// is_callable
|
|
//
|
|
template<typename Grammar>
|
|
struct is_callable<sprout::breed::pass_through<Grammar> >
|
|
: public std::true_type
|
|
{};
|
|
} // namespace breed
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_BREED_TRANSFORM_PASS_THROUGH_HPP
|