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[libc++] Implement the public invoke API in terms of the libc++-internal API #146334

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[libc++] Implement the public invoke API in terms of the libc++-internal API #146334

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114 changes: 40 additions & 74 deletions libcxx/include/__type_traits/invoke.h
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Original file line number Diff line number Diff line change
Expand Up @@ -42,19 +42,22 @@
// return std::invoke_r(std::forward<Args>(args)...);
// }
//
// template <class Ret, class Func, class... Args>
// inline const bool __is_invocable_r_v = is_invocable_r_v<Ret, Func, Args...>;
//
// template <class Func, class... Args>
// struct __is_invocable : is_invocable<Func, Args...> {};
//
// template <class Func, class... Args>
// inline const bool __is_invocable_v = is_invocable_v<Func, Args...>;
//
// template <class Ret, class Func, class... Args>
// inline const bool __is_invocable_r_v = is_invocable_r_v<Ret, Func, Args...>;
//
// template <class Func, class... Args>
// inline const bool __is_nothrow_invocable_v = is_nothrow_invocable_v<Func, Args...>;
//
// template <class Func, class... Args>
// inline const bool __is_nothrow_invocable_r_v = is_nothrow_invocable_r_v<Func, Args...>;
//
// template <class Func, class... Args>
// struct __invoke_result : invoke_result {};
//
// template <class Func, class... Args>
Expand Down Expand Up @@ -126,46 +129,6 @@ template <class _Ret, class... _Args>
inline const bool __is_nothrow_invocable_r_v =
__is_nothrow_invocable_r_impl<__is_nothrow_invocable_v<_Args...>, _Ret, _Args...>;

# if _LIBCPP_STD_VER >= 17

// is_invocable

template <class _Fn, class... _Args>
struct _LIBCPP_NO_SPECIALIZATIONS is_invocable : bool_constant<__is_invocable_v<_Fn, _Args...> > {};

template <class _Ret, class _Fn, class... _Args>
struct _LIBCPP_NO_SPECIALIZATIONS is_invocable_r : bool_constant<__is_invocable_r_v<_Ret, _Fn, _Args...>> {};

template <class _Fn, class... _Args>
_LIBCPP_NO_SPECIALIZATIONS inline constexpr bool is_invocable_v = __is_invocable_v<_Fn, _Args...>;

template <class _Ret, class _Fn, class... _Args>
_LIBCPP_NO_SPECIALIZATIONS inline constexpr bool is_invocable_r_v = is_invocable_r<_Ret, _Fn, _Args...>::value;

// is_nothrow_invocable

template <class _Fn, class... _Args>
struct _LIBCPP_NO_SPECIALIZATIONS is_nothrow_invocable : bool_constant<__is_nothrow_invocable_v<_Fn, _Args...> > {};

template <class _Ret, class _Fn, class... _Args>
struct _LIBCPP_NO_SPECIALIZATIONS is_nothrow_invocable_r
: integral_constant<bool, __is_nothrow_invocable_r_v<_Ret, _Fn, _Args...>> {};

template <class _Fn, class... _Args>
_LIBCPP_NO_SPECIALIZATIONS inline constexpr bool is_nothrow_invocable_v = __is_nothrow_invocable_v<_Fn, _Args...>;

template <class _Ret, class _Fn, class... _Args>
_LIBCPP_NO_SPECIALIZATIONS inline constexpr bool is_nothrow_invocable_r_v =
__is_nothrow_invocable_r_v<_Ret, _Fn, _Args...>;

template <class _Fn, class... _Args>
struct _LIBCPP_NO_SPECIALIZATIONS invoke_result : __invoke_result<_Fn, _Args...> {};

template <class _Fn, class... _Args>
using invoke_result_t = __invoke_result_t<_Fn, _Args...>;

# endif // _LIBCPP_STD_VER >= 17

#else // __has_builtin(__builtin_invoke)

template <class _DecayedFp>
Expand Down Expand Up @@ -352,19 +315,45 @@ inline const bool __is_invocable_r_v = __invokable_r<_Ret, _Func, _Args...>::val
template <class _Func, class... _Args>
inline const bool __is_nothrow_invocable_v = __nothrow_invokable<_Func, _Args...>::value;

template <class _Ret, class _Func, class... _Args>
inline const bool __is_nothrow_invocable_r_v = __nothrow_invokable_r<_Ret, _Func, _Args...>::value;

template <class _Func, class... _Args>
struct __invoke_result
: enable_if<__is_invocable_v<_Func, _Args...>, typename __invokable_r<void, _Func, _Args...>::_Result> {};

template <class _Func, class... _Args>
using __invoke_result_t _LIBCPP_NODEBUG = typename __invoke_result<_Func, _Args...>::type;

# if _LIBCPP_STD_VER >= 17
#endif // __has_builtin(__builtin_invoke_r)

template <class _Ret, bool = is_void<_Ret>::value>
struct __invoke_void_return_wrapper {
template <class... _Args>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 static _Ret __call(_Args&&... __args) {
return std::__invoke(std::forward<_Args>(__args)...);
}
};

template <class _Ret>
struct __invoke_void_return_wrapper<_Ret, true> {
template <class... _Args>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 static void __call(_Args&&... __args) {
std::__invoke(std::forward<_Args>(__args)...);
}
};

template <class _Ret, class... _Args>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Ret __invoke_r(_Args&&... __args) {
return __invoke_void_return_wrapper<_Ret>::__call(std::forward<_Args>(__args)...);
}

#if _LIBCPP_STD_VER >= 17

// is_invocable

template <class _Fn, class... _Args>
struct _LIBCPP_NO_SPECIALIZATIONS is_invocable : bool_constant<__is_invocable_v<_Fn, _Args...>> {};
struct _LIBCPP_NO_SPECIALIZATIONS is_invocable : bool_constant<__is_invocable_v<_Fn, _Args...> > {};

template <class _Ret, class _Fn, class... _Args>
struct _LIBCPP_NO_SPECIALIZATIONS is_invocable_r : bool_constant<__is_invocable_r_v<_Ret, _Fn, _Args...>> {};
Expand All @@ -378,49 +367,26 @@ _LIBCPP_NO_SPECIALIZATIONS inline constexpr bool is_invocable_r_v = __is_invocab
// is_nothrow_invocable

template <class _Fn, class... _Args>
struct _LIBCPP_NO_SPECIALIZATIONS is_nothrow_invocable : bool_constant<__nothrow_invokable<_Fn, _Args...>::value> {};
struct _LIBCPP_NO_SPECIALIZATIONS is_nothrow_invocable : bool_constant<__is_nothrow_invocable_v<_Fn, _Args...> > {};

template <class _Ret, class _Fn, class... _Args>
struct _LIBCPP_NO_SPECIALIZATIONS is_nothrow_invocable_r
: bool_constant<__nothrow_invokable_r<_Ret, _Fn, _Args...>::value> {};
: bool_constant<__is_nothrow_invocable_r_v<_Ret, _Fn, _Args...>> {};

template <class _Fn, class... _Args>
_LIBCPP_NO_SPECIALIZATIONS inline constexpr bool is_nothrow_invocable_v = is_nothrow_invocable<_Fn, _Args...>::value;
_LIBCPP_NO_SPECIALIZATIONS inline constexpr bool is_nothrow_invocable_v = __is_nothrow_invocable_v<_Fn, _Args...>;

template <class _Ret, class _Fn, class... _Args>
_LIBCPP_NO_SPECIALIZATIONS inline constexpr bool is_nothrow_invocable_r_v =
is_nothrow_invocable_r<_Ret, _Fn, _Args...>::value;
__is_nothrow_invocable_r_v<_Ret, _Fn, _Args...>;

template <class _Fn, class... _Args>
struct _LIBCPP_NO_SPECIALIZATIONS invoke_result : __invoke_result<_Fn, _Args...> {};

template <class _Fn, class... _Args>
using invoke_result_t = typename invoke_result<_Fn, _Args...>::type;

# endif // _LIBCPP_STD_VER >= 17

#endif // __has_builtin(__builtin_invoke_r)

template <class _Ret, bool = is_void<_Ret>::value>
struct __invoke_void_return_wrapper {
template <class... _Args>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 static _Ret __call(_Args&&... __args) {
return std::__invoke(std::forward<_Args>(__args)...);
}
};

template <class _Ret>
struct __invoke_void_return_wrapper<_Ret, true> {
template <class... _Args>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 static void __call(_Args&&... __args) {
std::__invoke(std::forward<_Args>(__args)...);
}
};
using invoke_result_t = __invoke_result_t<_Fn, _Args...>;

template <class _Ret, class... _Args>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Ret __invoke_r(_Args&&... __args) {
return __invoke_void_return_wrapper<_Ret>::__call(std::forward<_Args>(__args)...);
}
#endif

_LIBCPP_END_NAMESPACE_STD

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