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feat update invoke_result
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tqcq 2024-06-07 09:04:05 +08:00
parent 778d24b8de
commit 5f299117fe
1 changed files with 181 additions and 152 deletions
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259
src/sled/exec/detail/invoke_result.h
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@ -18,160 +18,170 @@ namespace detail {
#define EGGS_FWD(...) static_cast<decltype(__VA_ARGS__) &&>(__VA_ARGS__) #define EGGS_FWD(...) static_cast<decltype(__VA_ARGS__) &&>(__VA_ARGS__)
/////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////
template<typename C, typename T, bool Ref, bool RefWrapper, bool IsFunction = std::is_function<T>::value> template <typename C, typename T, bool Ref, bool RefWrapper,
bool IsFunction = std::is_function<T>::value>
struct invoke_mem_ptr; struct invoke_mem_ptr;
// when `pm` is a pointer to member of a class `C` and // when `pm` is a pointer to member of a class `C` and
// `is_base_of_v<C, remove_reference_t<T>>` is `true`; // `is_base_of_v<C, remove_reference_t<T>>` is `true`;
template<typename C, typename T> template <typename C, typename T>
struct invoke_mem_ptr<C, T, /*Ref=*/true, /*RefWrapper=*/false, /*IsFunction=*/false> { struct invoke_mem_ptr<C, T, /*Ref=*/true, /*RefWrapper=*/false,
/*IsFunction=*/false> {
T C::*pm; T C::*pm;
#if !__cpp_aggregate_paren_init #if !__cpp_aggregate_paren_init
constexpr invoke_mem_ptr(T C::*pm) noexcept : pm(pm) {} constexpr invoke_mem_ptr(T C::*pm) noexcept : pm(pm) {}
#endif #endif
template<typename T1> template <typename T1>
constexpr auto operator()(T1 &&t1) const noexcept(noexcept(EGGS_FWD(t1).*pm)) -> decltype(EGGS_FWD(t1).*pm) constexpr auto operator()(T1 &&t1) const
{ noexcept(noexcept(EGGS_FWD(t1).*pm)) -> decltype(EGGS_FWD(t1).*pm) {
return EGGS_FWD(t1).*pm; return EGGS_FWD(t1).*pm;
} }
}; };
template<typename C, typename T> template <typename C, typename T>
struct invoke_mem_ptr<C, T, /*Ref=*/true, /*RefWrapper=*/false, /*IsFunction=*/true> { struct invoke_mem_ptr<C, T, /*Ref=*/true, /*RefWrapper=*/false,
/*IsFunction=*/true> {
T C::*pm; T C::*pm;
#if !__cpp_aggregate_paren_init #if !__cpp_aggregate_paren_init
constexpr invoke_mem_ptr(T C::*pm) noexcept : pm(pm) {} constexpr invoke_mem_ptr(T C::*pm) noexcept : pm(pm) {}
#endif #endif
template<typename T1, typename... Tn> template <typename T1, typename... Tn>
constexpr auto operator()(T1 &&t1, Tn &&...tn) const noexcept(noexcept((EGGS_FWD(t1).*pm)(EGGS_FWD(tn)...))) constexpr auto operator()(T1 &&t1, Tn &&...tn) const
-> decltype((EGGS_FWD(t1).*pm)(EGGS_FWD(tn)...)) noexcept(noexcept((EGGS_FWD(t1).*pm)(EGGS_FWD(tn)...)))
{ -> decltype((EGGS_FWD(t1).*pm)(EGGS_FWD(tn)...)) {
return (EGGS_FWD(t1).*pm)(EGGS_FWD(tn)...); return (EGGS_FWD(t1).*pm)(EGGS_FWD(tn)...);
} }
}; };
// when `pm` is a pointer to member of a class `C` and // when `pm` is a pointer to member of a class `C` and
// `remove_cvref_t<T>` is a specialization of `reference_wrapper`; // `remove_cvref_t<T>` is a specialization of `reference_wrapper`;
template<typename C, typename T> template <typename C, typename T>
struct invoke_mem_ptr<C, T, /*Ref=*/false, /*RefWrapper=*/true, /*IsFunction=*/false> { struct invoke_mem_ptr<C, T, /*Ref=*/false, /*RefWrapper=*/true,
/*IsFunction=*/false> {
T C::*pm; T C::*pm;
#if !__cpp_aggregate_paren_init #if !__cpp_aggregate_paren_init
constexpr invoke_mem_ptr(T C::*pm) noexcept : pm(pm) {} constexpr invoke_mem_ptr(T C::*pm) noexcept : pm(pm) {}
#endif #endif
template<typename T1> template <typename T1>
constexpr auto operator()(T1 &&t1) const noexcept(noexcept(t1.get().*pm)) -> decltype(t1.get().*pm) constexpr auto operator()(T1 &&t1) const
{ noexcept(noexcept(t1.get().*pm)) -> decltype(t1.get().*pm) {
return t1.get().*pm; return t1.get().*pm;
} }
}; };
template<typename C, typename T> template <typename C, typename T>
struct invoke_mem_ptr<C, T, /*Ref=*/false, /*RefWrapper=*/true, /*IsFunction=*/true> { struct invoke_mem_ptr<C, T, /*Ref=*/false, /*RefWrapper=*/true,
/*IsFunction=*/true> {
T C::*pm; T C::*pm;
#if !__cpp_aggregate_paren_init #if !__cpp_aggregate_paren_init
constexpr invoke_mem_ptr(T C::*pm) noexcept : pm(pm) {} constexpr invoke_mem_ptr(T C::*pm) noexcept : pm(pm) {}
#endif #endif
template<typename T1, typename... Tn> template <typename T1, typename... Tn>
constexpr auto operator()(T1 &&t1, Tn &&...tn) const noexcept(noexcept((t1.get().*pm)(EGGS_FWD(tn)...))) constexpr auto operator()(T1 &&t1, Tn &&...tn) const
-> decltype((t1.get().*pm)(EGGS_FWD(tn)...)) noexcept(noexcept((t1.get().*pm)(EGGS_FWD(tn)...)))
{ -> decltype((t1.get().*pm)(EGGS_FWD(tn)...)) {
return (t1.get().*pm)(EGGS_FWD(tn)...); return (t1.get().*pm)(EGGS_FWD(tn)...);
} }
}; };
// when `pm` is a pointer to member of a class `C` and `T` does not // when `pm` is a pointer to member of a class `C` and `T` does not
// satisfy the previous two items; // satisfy the previous two items;
template<typename C, typename T> template <typename C, typename T>
struct invoke_mem_ptr<C, T, /*Ref=*/false, /*RefWrapper=*/false, /*IsFunction=*/false> { struct invoke_mem_ptr<C, T, /*Ref=*/false, /*RefWrapper=*/false,
/*IsFunction=*/false> {
T C::*pm; T C::*pm;
#if !__cpp_aggregate_paren_init #if !__cpp_aggregate_paren_init
constexpr invoke_mem_ptr(T C::*pm) noexcept : pm(pm) {} constexpr invoke_mem_ptr(T C::*pm) noexcept : pm(pm) {}
#endif #endif
template<typename T1> template <typename T1>
constexpr auto operator()(T1 &&t1) const noexcept(noexcept((*EGGS_FWD(t1)).*pm)) -> decltype((*EGGS_FWD(t1)).*pm) constexpr auto operator()(T1 &&t1) const
{ noexcept(noexcept((*EGGS_FWD(t1)).*pm)) -> decltype((*EGGS_FWD(t1)).*pm) {
return (*EGGS_FWD(t1)).*pm; return (*EGGS_FWD(t1)).*pm;
} }
}; };
template<typename C, typename T> template <typename C, typename T>
struct invoke_mem_ptr<C, T, /*Ref=*/false, /*RefWrapper=*/false, /*IsFunction=*/true> { struct invoke_mem_ptr<C, T, /*Ref=*/false, /*RefWrapper=*/false,
/*IsFunction=*/true> {
T C::*pm; T C::*pm;
#if !__cpp_aggregate_paren_init #if !__cpp_aggregate_paren_init
constexpr invoke_mem_ptr(T C::*pm) noexcept : pm(pm) {} constexpr invoke_mem_ptr(T C::*pm) noexcept : pm(pm) {}
#endif #endif
template<typename T1, typename... Tn> template <typename T1, typename... Tn>
constexpr auto operator()(T1 &&t1, Tn &&...tn) const noexcept(noexcept(((*EGGS_FWD(t1)).*pm)(EGGS_FWD(tn)...))) constexpr auto operator()(T1 &&t1, Tn &&...tn) const
-> decltype(((*EGGS_FWD(t1)).*pm)(EGGS_FWD(tn)...)) noexcept(noexcept(((*EGGS_FWD(t1)).*pm)(EGGS_FWD(tn)...)))
{ -> decltype(((*EGGS_FWD(t1)).*pm)(EGGS_FWD(tn)...)) {
return ((*EGGS_FWD(t1)).*pm)(EGGS_FWD(tn)...); return ((*EGGS_FWD(t1)).*pm)(EGGS_FWD(tn)...);
} }
}; };
/////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////
template<typename F> template <typename F> auto invoke(F &&, ...) -> F &&;
auto invoke(F &&, ...) -> F &&;
template<typename T, typename C, typename T1> template <typename T, typename C, typename T1>
auto invoke(T C::*, T1 const &, ...) -> invoke_mem_ptr<C, auto invoke(T C::*, T1 const &,
T, ...) -> invoke_mem_ptr<C, T,
/*Ref=*/std::is_base_of<C, T1>::value, /*Ref=*/std::is_base_of<C, T1>::value,
/*RefWrapper=*/false>; /*RefWrapper=*/false>;
template<typename T, typename C, typename X> template <typename T, typename C, typename X>
auto invoke(T C::*, std::reference_wrapper<X>, ...) -> invoke_mem_ptr<C, auto invoke(T C::*, std::reference_wrapper<X>,
T, ...) -> invoke_mem_ptr<C, T,
/*Ref=*/false, /*Ref=*/false,
/*RefWrapper=*/true>; /*RefWrapper=*/true>;
//! EGGS_INVOKE(F, ...) //! EGGS_INVOKE(F, ...)
//! //!
//! - _Returns_: `INVOKE(F __VA_OPT__(,) __VA_ARGS__)`. //! - _Returns_: `INVOKE(F __VA_OPT__(,) __VA_ARGS__)`.
#if __cplusplus > 201703L// C++20: P0306 #if __cplusplus > 201703L // C++20: P0306
#define EGGS_INVOKE(F, ...) \ #define EGGS_INVOKE(F, ...) \
(static_cast<decltype(::eggs::detail::invoke(F __VA_OPT__(, ) __VA_ARGS__))>(F)(__VA_ARGS__)) (static_cast<decltype(::eggs::detail::invoke( \
F __VA_OPT__(, ) __VA_ARGS__))>(F)(__VA_ARGS__))
#elif _MSVC_TRADITIONAL #elif _MSVC_TRADITIONAL
#define EGGS_INVOKE(F, ...) (static_cast<decltype(::eggs::detail::invoke(F, __VA_ARGS__))>(F)(__VA_ARGS__)) #define EGGS_INVOKE(F, ...) \
(static_cast<decltype(::eggs::detail::invoke(F, __VA_ARGS__))>(F)( \
__VA_ARGS__))
#else #else
#define EGGS_INVOKE(F, ...) (static_cast<decltype(::eggs::detail::invoke(F, ##__VA_ARGS__))>(F)(__VA_ARGS__)) #define EGGS_INVOKE(F, ...) \
(static_cast<decltype(::eggs::detail::invoke(F, ##__VA_ARGS__))>(F)( \
__VA_ARGS__))
#endif #endif
/////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////
// `INVOKE(f, t1, t2, ..., tN)` implicitly converted to `R`. // `INVOKE(f, t1, t2, ..., tN)` implicitly converted to `R`.
template<typename R, typename RD = typename std::remove_cv<R>::type> template <typename R, typename RD = typename std::remove_cv<R>::type>
struct invoke_r { struct invoke_r {
private: private:
static R conversion(R) noexcept; static R conversion(R) noexcept;
public: public:
template<typename F, typename... Args> template <typename F, typename... Args>
static constexpr auto static constexpr auto call(F &&f, Args &&...args) noexcept(
call(F &&f, Args &&...args) noexcept(noexcept(conversion(EGGS_INVOKE(EGGS_FWD(f), EGGS_FWD(args)...)))) noexcept(conversion(EGGS_INVOKE(EGGS_FWD(f), EGGS_FWD(args)...))))
-> decltype(conversion(EGGS_INVOKE(EGGS_FWD(f), EGGS_FWD(args)...))) -> decltype(conversion(EGGS_INVOKE(EGGS_FWD(f), EGGS_FWD(args)...))) {
{
return EGGS_INVOKE(EGGS_FWD(f), EGGS_FWD(args)...); return EGGS_INVOKE(EGGS_FWD(f), EGGS_FWD(args)...);
} }
}; };
// `static_cast<void>(INVOKE(f, t1, t2, ..., tN))` if `R` is _cv_ `void`. // `static_cast<void>(INVOKE(f, t1, t2, ..., tN))` if `R` is _cv_ `void`.
template<typename R> template <typename R> struct invoke_r<R, void> {
struct invoke_r<R, void> { template <typename F, typename... Args>
template<typename F, typename... Args> static constexpr auto call(F &&f, Args &&...args) noexcept(
static constexpr auto call(F &&f, Args &&...args) noexcept(noexcept(EGGS_INVOKE(EGGS_FWD(f), EGGS_FWD(args)...))) noexcept(EGGS_INVOKE(EGGS_FWD(f), EGGS_FWD(args)...)))
-> decltype(static_cast<void>(EGGS_INVOKE(EGGS_FWD(f), EGGS_FWD(args)...))) -> decltype(static_cast<void>(EGGS_INVOKE(EGGS_FWD(f),
{ EGGS_FWD(args)...))) {
return static_cast<void>(EGGS_INVOKE(EGGS_FWD(f), EGGS_FWD(args)...)); return static_cast<void>(EGGS_INVOKE(EGGS_FWD(f), EGGS_FWD(args)...));
} }
}; };
@ -181,20 +191,21 @@ struct invoke_r<R, void> {
//! - _Returns_: `INVOKE<R>(F __VA_OPT__(,) __VA_ARGS__)`. //! - _Returns_: `INVOKE<R>(F __VA_OPT__(,) __VA_ARGS__)`.
#define EGGS_INVOKE_R(R, ...) (::eggs::detail::invoke_r<R>::call(__VA_ARGS__)) #define EGGS_INVOKE_R(R, ...) (::eggs::detail::invoke_r<R>::call(__VA_ARGS__))
}// namespace detail } // namespace detail
}// namespace eggs } // namespace eggs
namespace eggs { namespace eggs {
/////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////
namespace detail { namespace detail {
template<typename T, typename Enable = void> template <typename T, typename Enable = void> struct invoke_result_impl {};
struct invoke_result_impl {};
template<typename F, typename... Ts> template <typename F, typename... Ts>
struct invoke_result_impl<F(Ts...), decltype((void) EGGS_INVOKE(std::declval<F>(), std::declval<Ts>()...))> { struct invoke_result_impl<F(Ts...),
decltype((void)EGGS_INVOKE(std::declval<F>(),
std::declval<Ts>()...))> {
using type = decltype(EGGS_INVOKE(std::declval<F>(), std::declval<Ts>()...)); using type = decltype(EGGS_INVOKE(std::declval<F>(), std::declval<Ts>()...));
}; };
}// namespace detail } // namespace detail
//! template <class Fn, class... ArgTypes> struct invoke_result; //! template <class Fn, class... ArgTypes> struct invoke_result;
//! //!
@ -209,23 +220,25 @@ struct invoke_result_impl<F(Ts...), decltype((void) EGGS_INVOKE(std::declval<F>(
//! - _Preconditions_: `Fn` and all types in the template parameter pack //! - _Preconditions_: `Fn` and all types in the template parameter pack
//! `ArgTypes` are complete types, _cv_ `void`, or arrays of unknown //! `ArgTypes` are complete types, _cv_ `void`, or arrays of unknown
//! bound. //! bound.
template<typename Fn, typename... ArgTypes> template <typename Fn, typename... ArgTypes>
struct invoke_result : detail::invoke_result_impl<Fn && (ArgTypes && ...)> {}; struct invoke_result : detail::invoke_result_impl<Fn && (ArgTypes && ...)> {};
//! template <class Fn, class... ArgTypes> //! template <class Fn, class... ArgTypes>
//! using invoke_result_t = typename invoke_result<Fn, ArgTypes...>::type; //! using invoke_result_t = typename invoke_result<Fn, ArgTypes...>::type;
template<typename Fn, typename... ArgTypes> template <typename Fn, typename... ArgTypes>
using invoke_result_t = typename invoke_result<Fn, ArgTypes...>::type; using invoke_result_t = typename invoke_result<Fn, ArgTypes...>::type;
/////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////
namespace detail { namespace detail {
template<typename T, typename Enable = void> template <typename T, typename Enable = void>
struct is_invocable_impl : std::false_type {}; struct is_invocable_impl : std::false_type {};
template<typename F, typename... Ts> template <typename F, typename... Ts>
struct is_invocable_impl<F(Ts...), decltype((void) EGGS_INVOKE(std::declval<F>(), std::declval<Ts>()...))> struct is_invocable_impl<F(Ts...),
decltype((void)EGGS_INVOKE(std::declval<F>(),
std::declval<Ts>()...))>
: std::true_type {}; : std::true_type {};
}// namespace detail } // namespace detail
//! template <class Fn, class... ArgTypes> struct is_invocable; //! template <class Fn, class... ArgTypes> struct is_invocable;
//! //!
@ -236,14 +249,15 @@ struct is_invocable_impl<F(Ts...), decltype((void) EGGS_INVOKE(std::declval<F>()
//! - _Comments_: `Fn` and all types in the template parameter pack //! - _Comments_: `Fn` and all types in the template parameter pack
//! `ArgTypes` shall be complete types, _cv_ `void`, or arrays of //! `ArgTypes` shall be complete types, _cv_ `void`, or arrays of
//! unknown bound. //! unknown bound.
template<typename Fn, typename... ArgTypes> template <typename Fn, typename... ArgTypes>
struct is_invocable : detail::is_invocable_impl<Fn && (ArgTypes && ...)>::type {}; struct is_invocable : detail::is_invocable_impl<Fn && (ArgTypes && ...)>::type {
};
#if __cpp_variable_templates #if __cpp_variable_templates
//! template <class Fn, class... ArgTypes> // (C++14) //! template <class Fn, class... ArgTypes> // (C++14)
//! inline constexpr bool is_invocable_v = //! inline constexpr bool is_invocable_v =
//! eggs::is_invocable<Fn, ArgTypes...>::value; //! eggs::is_invocable<Fn, ArgTypes...>::value;
template<typename Fn, typename... ArgTypes> template <typename Fn, typename... ArgTypes>
#if __cpp_inline_variables #if __cpp_inline_variables
inline inline
#endif #endif
@ -252,13 +266,15 @@ inline
/////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////
namespace detail { namespace detail {
template<typename T, typename R, typename Enable = void> template <typename T, typename R, typename Enable = void>
struct is_invocable_r_impl : std::false_type {}; struct is_invocable_r_impl : std::false_type {};
template<typename F, typename... Ts, typename R> template <typename F, typename... Ts, typename R>
struct is_invocable_r_impl<F(Ts...), R, decltype((void) EGGS_INVOKE_R(R, std::declval<F>(), std::declval<Ts>()...))> struct is_invocable_r_impl<F(Ts...), R,
decltype((void)EGGS_INVOKE_R(R, std::declval<F>(),
std::declval<Ts>()...))>
: std::true_type {}; : std::true_type {};
}// namespace detail } // namespace detail
//! template <class R, class Fn, class... ArgTypes> struct is_invocable_r; //! template <class R, class Fn, class... ArgTypes> struct is_invocable_r;
//! //!
@ -269,14 +285,15 @@ struct is_invocable_r_impl<F(Ts...), R, decltype((void) EGGS_INVOKE_R(R, std::de
//! - _Comments_: `Fn`, `R`, and all types in the template parameter pack //! - _Comments_: `Fn`, `R`, and all types in the template parameter pack
//! `ArgTypes` shall be complete types, _cv_ `void`, or arrays of //! `ArgTypes` shall be complete types, _cv_ `void`, or arrays of
//! unknown bound. //! unknown bound.
template<typename R, typename Fn, typename... ArgTypes> template <typename R, typename Fn, typename... ArgTypes>
struct is_invocable_r : detail::is_invocable_r_impl<Fn && (ArgTypes && ...), R>::type {}; struct is_invocable_r
: detail::is_invocable_r_impl<Fn && (ArgTypes && ...), R>::type {};
#if __cpp_variable_templates #if __cpp_variable_templates
//! template <class R, class Fn, class... ArgTypes> // (C++14) //! template <class R, class Fn, class... ArgTypes> // (C++14)
//! inline constexpr bool is_invocable_r_v = //! inline constexpr bool is_invocable_r_v =
//! eggs::is_invocable_r<R, Fn, ArgTypes...>::value; //! eggs::is_invocable_r<R, Fn, ArgTypes...>::value;
template<typename R, typename Fn, typename... ArgTypes> template <typename R, typename Fn, typename... ArgTypes>
#if __cpp_inline_variables #if __cpp_inline_variables
inline inline
#endif #endif
@ -285,13 +302,17 @@ inline
/////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////
namespace detail { namespace detail {
template<typename T, typename Enable = void> template <typename T, typename Enable = void>
struct is_nothrow_invocable_impl : std::false_type {}; struct is_nothrow_invocable_impl : std::false_type {};
template<typename F, typename... Ts> template <typename F, typename... Ts>
struct is_nothrow_invocable_impl<F(Ts...), decltype((void) EGGS_INVOKE(std::declval<F>(), std::declval<Ts>()...))> struct is_nothrow_invocable_impl<F(Ts...),
: std::integral_constant<bool, noexcept(EGGS_INVOKE(std::declval<F>(), std::declval<Ts>()...))> {}; decltype((void)EGGS_INVOKE(
}// namespace detail std::declval<F>(), std::declval<Ts>()...))>
: std::integral_constant<bool,
noexcept(EGGS_INVOKE(std::declval<F>(),
std::declval<Ts>()...))> {};
} // namespace detail
//! template <class Fn, class... ArgTypes> struct is_nothrow_invocable; //! template <class Fn, class... ArgTypes> struct is_nothrow_invocable;
//! //!
@ -302,53 +323,60 @@ struct is_nothrow_invocable_impl<F(Ts...), decltype((void) EGGS_INVOKE(std::decl
//! - _Comments_: `Fn` and all types in the template parameter pack //! - _Comments_: `Fn` and all types in the template parameter pack
//! `ArgTypes` shall be complete types, _cv_ `void`, or arrays of //! `ArgTypes` shall be complete types, _cv_ `void`, or arrays of
//! unknown bound. //! unknown bound.
template<typename Fn, typename... ArgTypes> template <typename Fn, typename... ArgTypes>
struct is_nothrow_invocable : detail::is_nothrow_invocable_impl<Fn && (ArgTypes && ...)>::type {}; struct is_nothrow_invocable
: detail::is_nothrow_invocable_impl<Fn && (ArgTypes && ...)>::type {};
#if __cpp_variable_templates #if __cpp_variable_templates
//! template <class Fn, class... ArgTypes> // (C++14) //! template <class Fn, class... ArgTypes> // (C++14)
//! inline constexpr bool is_nothrow_invocable_v = //! inline constexpr bool is_nothrow_invocable_v =
//! eggs::is_nothrow_invocable<Fn, ArgTypes...>::value; //! eggs::is_nothrow_invocable<Fn, ArgTypes...>::value;
template<typename Fn, typename... ArgTypes> template <typename Fn, typename... ArgTypes>
#if __cpp_inline_variables #if __cpp_inline_variables
inline inline
#endif #endif
constexpr bool is_nothrow_invocable_v = is_nothrow_invocable<Fn, ArgTypes...>::value; constexpr bool is_nothrow_invocable_v =
is_nothrow_invocable<Fn, ArgTypes...>::value;
#endif #endif
/////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////
namespace detail { namespace detail {
template<typename T, typename R, typename Enable = void> template <typename T, typename R, typename Enable = void>
struct is_nothrow_invocable_r_impl : std::false_type {}; struct is_nothrow_invocable_r_impl : std::false_type {};
template<typename F, typename... Ts, typename R> template <typename F, typename... Ts, typename R>
struct is_nothrow_invocable_r_impl<F(Ts...), struct is_nothrow_invocable_r_impl<
R, F(Ts...), R,
decltype((void) EGGS_INVOKE_R(R, std::declval<F>(), std::declval<Ts>()...))> decltype((void)EGGS_INVOKE_R(R, std::declval<F>(), std::declval<Ts>()...))>
: std::integral_constant<bool, noexcept(EGGS_INVOKE_R(R, std::declval<F>(), std::declval<Ts>()...))> {}; : std::integral_constant<bool,
}// namespace detail noexcept(EGGS_INVOKE_R(R, std::declval<F>(),
std::declval<Ts>()...))> {};
} // namespace detail
//! template <class R, class Fn, class... ArgTypes> struct is_nothrow_invocable_r; //! template <class R, class Fn, class... ArgTypes> struct
//! is_nothrow_invocable_r;
//! //!
//! - _Condition_: `eggs::is_invocable_r_v<R, Fn, ArgTypes...>` is `true` //! - _Condition_: `eggs::is_invocable_r_v<R, Fn, ArgTypes...>` is `true`
//! and the expression `INVOKE(std::declval<Fn>(), std::declval<ArgTypes>()...)` //! and the expression `INVOKE(std::declval<Fn>(),
//! is known not to throw any exceptions. //! std::declval<ArgTypes>()...)` is known not to throw any exceptions.
//! //!
//! - _Comments_: `Fn`, `R`, and all types in the template parameter pack //! - _Comments_: `Fn`, `R`, and all types in the template parameter pack
//! `ArgTypes` shall be complete types, _cv_ `void`, or arrays of //! `ArgTypes` shall be complete types, _cv_ `void`, or arrays of
//! unknown bound. //! unknown bound.
template<typename R, typename Fn, typename... ArgTypes> template <typename R, typename Fn, typename... ArgTypes>
struct is_nothrow_invocable_r : detail::is_nothrow_invocable_r_impl<Fn && (ArgTypes && ...), R>::type {}; struct is_nothrow_invocable_r
: detail::is_nothrow_invocable_r_impl<Fn && (ArgTypes && ...), R>::type {};
#if __cpp_variable_templates #if __cpp_variable_templates
//! template <class R, class Fn, class... ArgTypes> // (C++14) //! template <class R, class Fn, class... ArgTypes> // (C++14)
//! inline constexpr bool is_nothrow_invocable_r_v = //! inline constexpr bool is_nothrow_invocable_r_v =
//! eggs::is_nothrow_invocable_r<R, Fn, ArgTypes...>::value; //! eggs::is_nothrow_invocable_r<R, Fn, ArgTypes...>::value;
template<typename R, typename Fn, typename... ArgTypes> template <typename R, typename Fn, typename... ArgTypes>
#if __cpp_inline_variables #if __cpp_inline_variables
inline inline
#endif #endif
constexpr bool is_nothrow_invocable_r_v = is_nothrow_invocable_r<R, Fn, ArgTypes...>::value; constexpr bool is_nothrow_invocable_r_v =
is_nothrow_invocable_r<R, Fn, ArgTypes...>::value;
#endif #endif
/////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////
@ -360,11 +388,10 @@ inline
//! //!
//! - _Remarks_: This function shall not participate in overload resolution //! - _Remarks_: This function shall not participate in overload resolution
//! unless `eggs::is_invocable_v<F, Args...>` is `true`. //! unless `eggs::is_invocable_v<F, Args...>` is `true`.
template<typename Fn, typename... ArgTypes> template <typename Fn, typename... ArgTypes>
constexpr auto constexpr auto invoke(Fn &&f, ArgTypes &&...args) noexcept(
invoke(Fn &&f, ArgTypes &&...args) noexcept(noexcept(EGGS_INVOKE(EGGS_FWD(f), EGGS_FWD(args)...))) noexcept(EGGS_INVOKE(EGGS_FWD(f), EGGS_FWD(args)...)))
-> decltype(EGGS_INVOKE(EGGS_FWD(f), EGGS_FWD(args)...)) -> decltype(EGGS_INVOKE(EGGS_FWD(f), EGGS_FWD(args)...)) {
{
return EGGS_INVOKE(EGGS_FWD(f), EGGS_FWD(args)...); return EGGS_INVOKE(EGGS_FWD(f), EGGS_FWD(args)...);
} }
@ -377,15 +404,17 @@ invoke(Fn &&f, ArgTypes &&...args) noexcept(noexcept(EGGS_INVOKE(EGGS_FWD(f), EG
//! //!
//! - _Remarks_: This function shall not participate in overload resolution //! - _Remarks_: This function shall not participate in overload resolution
//! unless `eggs::is_invocable_r_v<R, F, Args...>` is `true`. //! unless `eggs::is_invocable_r_v<R, F, Args...>` is `true`.
template<typename R, typename Fn, typename... ArgTypes> template <typename R, typename Fn, typename... ArgTypes>
constexpr auto constexpr auto invoke_r(Fn &&f, ArgTypes &&...args) noexcept(
invoke_r(Fn &&f, ArgTypes &&...args) noexcept(noexcept(EGGS_INVOKE_R(R, EGGS_FWD(f), EGGS_FWD(args)...))) noexcept(EGGS_INVOKE_R(R, EGGS_FWD(f), EGGS_FWD(args)...)))
-> decltype(EGGS_INVOKE_R(R, EGGS_FWD(f), EGGS_FWD(args)...)) -> decltype(EGGS_INVOKE_R(R, EGGS_FWD(f), EGGS_FWD(args)...)) {
{
return EGGS_INVOKE_R(R, EGGS_FWD(f), EGGS_FWD(args)...); return EGGS_INVOKE_R(R, EGGS_FWD(f), EGGS_FWD(args)...);
} }
#undef EGGS_FWD #undef EGGS_FWD
}// namespace eggs } // namespace eggs
namespace tile {
using namespace eggs;
}
#endif /*EGGS_INVOKE_HPP*/ #endif /*EGGS_INVOKE_HPP*/