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add automatically-placeholder '_'

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bolero-MURAKAMI 2013-07-07 23:05:18 +09:00
parent 2f86a59273
commit e052c3d3a9
2 changed files with 81 additions and 15 deletions
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84
sprout/functional/bind/bind.hpp
View file

@ -288,14 +288,14 @@ namespace sprout {
};
//
// bind_result
// res_binder
//
template<typename Result, typename Signature>
class bind_result;
class res_binder;
template<typename Result, typename Functor, typename... BoundArgs>
class bind_result<Result, Functor(BoundArgs...)> {
class res_binder<Result, Functor(BoundArgs...)> {
private:
typedef bind_result self_type;
typedef res_binder self_type;
typedef typename sprout::index_pack<BoundArgs...>::type bound_indexes;
private:
template<typename Res>
@ -385,11 +385,11 @@ namespace sprout {
public:
typedef Result result_type;
template<typename... Args>
explicit bind_result(Functor const& f, Args&&... args)
explicit res_binder(Functor const& f, Args&&... args)
: f_(f)
, bound_args_(sprout::forward<Args>(args)...)
{}
bind_result(bind_result const&) = default;
res_binder(res_binder const&) = default;
template<typename... Args>
result_type operator()(Args&&... args) {
return call<Result>(
@ -428,33 +428,87 @@ namespace sprout {
: public std::true_type
{};
template<typename Result, typename Signature>
struct is_bind_expression<sprout::bind_result<Result, Signature> >
struct is_bind_expression<sprout::res_binder<Result, Signature> >
: public std::true_type
{};
namespace detail {
template<sprout::index_t Index, typename BoundArg, typename = void>
struct complete_placeholder {
public:
typedef BoundArg type;
};
template<sprout::index_t Index, typename BoundArg>
struct complete_placeholder<
Index, BoundArg,
typename std::enable_if<(sprout::is_placeholder<BoundArg>::value == -1)>::type
> {
public:
typedef sprout::placeholder<Index + 1> type;
};
template<typename Func, typename IndexTuple, typename... BoundArgs>
struct binder_complete_placeholders_impl;
template<typename Func, typename... BoundArgs, sprout::index_t... Indexes>
struct binder_complete_placeholders_impl<Func, sprout::index_tuple<Indexes...>, BoundArgs...> {
public:
typedef sprout::binder<Func (typename sprout::detail::complete_placeholder<Indexes, BoundArgs>::type...)> type;
};
template<typename Func, typename... BoundArgs>
struct binder_complete_placeholders
: public sprout::detail::binder_complete_placeholders_impl<Func, typename sprout::index_pack<BoundArgs...>::type, BoundArgs...>
{};
template<typename Result, typename Func, typename IndexTuple, typename... BoundArgs>
struct res_binder_complete_placeholders_impl;
template<typename Result, typename Func, typename... BoundArgs, sprout::index_t... Indexes>
struct res_binder_complete_placeholders_impl<Result, Func, sprout::index_tuple<Indexes...>, BoundArgs...> {
public:
typedef sprout::res_binder<Result, Func (typename sprout::detail::complete_placeholder<Indexes, BoundArgs>::type...)> type;
};
template<typename Result, typename Func, typename... BoundArgs>
struct res_binder_complete_placeholders
: public sprout::detail::res_binder_complete_placeholders_impl<Result, Func, typename sprout::index_pack<BoundArgs...>::type, BoundArgs...>
{};
template<typename Func, typename... BoundArgs>
struct bind_helper {
public:
typedef sprout::detail::maybe_wrap_member_pointer<typename std::decay<Func>::type> maybe_type;
typedef typename maybe_type::type func_type;
typedef sprout::binder<func_type (typename std::decay<BoundArgs>::type...)> type;
typedef typename sprout::detail::binder_complete_placeholders<func_type, typename std::decay<BoundArgs>::type...>::type type;
// typedef sprout::binder<func_type (typename std::decay<BoundArgs>::type...)> type;
};
template<typename Result, typename Func, typename... BoundArgs>
struct bindres_helper {
struct res_bind_helper {
public:
typedef sprout::detail::maybe_wrap_member_pointer<typename std::decay<Func>::type> maybe_type;
typedef typename maybe_type::type functor_type;
typedef sprout::bind_result<Result, functor_type (typename std::decay<BoundArgs>::type...)> type;
typedef typename sprout::detail::res_binder_complete_placeholders<Result, functor_type, typename std::decay<BoundArgs>::type...>::type type;
// typedef sprout::res_binder<Result, functor_type (typename std::decay<BoundArgs>::type...)> type;
};
} // namespace detail
//
// bind_result
// res_bind_result
//
template<typename F, typename... BoundArgs>
struct bind_result {
public:
typedef typename sprout::detail::bind_helper<F, BoundArgs...>::type type;
};
template<typename R, typename F, typename... BoundArgs>
struct res_bind_result {
public:
typedef typename sprout::detail::res_bind_helper<R, F, BoundArgs...>::type type;
};
//
// bind
//
template<typename F, typename... BoundArgs>
inline SPROUT_CONSTEXPR typename sprout::detail::bind_helper<F, BoundArgs...>::type
inline SPROUT_CONSTEXPR typename sprout::bind_result<F, BoundArgs...>::type
bind(F&& f, BoundArgs&&... args) {
typedef sprout::detail::bind_helper<F, BoundArgs...> helper_type;
typedef typename helper_type::maybe_type maybe_type;
@ -462,9 +516,9 @@ namespace sprout {
return result_type(maybe_type::do_wrap(sprout::forward<F>(f)), sprout::forward<BoundArgs>(args)...);
}
template<typename R, typename F, typename... BoundArgs>
inline SPROUT_CONSTEXPR typename sprout::detail::bindres_helper<R, F, BoundArgs...>::type
inline SPROUT_CONSTEXPR typename sprout::res_bind_result<R, F, BoundArgs...>::type
bind(F&& f, BoundArgs&&... args) {
typedef sprout::detail::bindres_helper<R, F, BoundArgs...> helper_type;
typedef sprout::detail::res_bind_helper<R, F, BoundArgs...> helper_type;
typedef typename helper_type::maybe_type maybe_type;
typedef typename helper_type::type result_type;
return result_type(maybe_type::do_wrap(sprout::forward<F>(f)), sprout::forward<BoundArgs>(args)...);
@ -479,7 +533,7 @@ namespace sprout {
return sprout::bind(sprout::forward<F>(f), sprout::forward<BoundArgs>(args)...);
}
template<typename R, typename F, typename... BoundArgs>
inline SPROUT_CONSTEXPR typename sprout::detail::bindres_helper<R, F, BoundArgs...>::type const
inline SPROUT_CONSTEXPR typename sprout::detail::res_bind_helper<R, F, BoundArgs...>::type const
cbind(F&& f, BoundArgs&&... args) {
return sprout::bind<R>(sprout::forward<F>(f), sprout::forward<BoundArgs>(args)...);
}

12
sprout/functional/bind/placeholder.hpp
View file

@ -10,6 +10,14 @@ namespace sprout {
//
template<int N>
struct placeholder {};
template<>
struct placeholder<-1> {
public:
template<int N2>
SPROUT_CONSTEXPR operator sprout::placeholder<N2>() const {
return sprout::placeholder<N2>();
}
};
namespace placeholders {
namespace {
@ -43,6 +51,8 @@ namespace sprout {
SPROUT_STATIC_CONSTEXPR sprout::placeholder<28> _28 = {};
SPROUT_STATIC_CONSTEXPR sprout::placeholder<29> _29 = {};
SPROUT_STATIC_CONSTEXPR sprout::placeholder<30> _30 = {};
SPROUT_STATIC_CONSTEXPR sprout::placeholder<-1> _ = {};
} // anonymous-namespace
} // namespace placeholders
using sprout::placeholders::_1;
@ -76,6 +86,8 @@ namespace sprout {
using sprout::placeholders::_29;
using sprout::placeholders::_30;
using sprout::placeholders::_;
//
// is_placeholder
//