[libcxx-commits] [libcxx] Speed up std::invoke() compile times by 40%-80% (PR #213403)
via libcxx-commits
libcxx-commits at lists.llvm.org
Sun Aug 2 20:46:05 PDT 2026
https://github.com/higher-performance updated https://github.com/llvm/llvm-project/pull/213403
>From d8c10d07978f7251f632fdc3043e6ee704f493ab Mon Sep 17 00:00:00 2001
From: higher-performance <higher.performance.github at gmail.com>
Date: Sat, 1 Aug 2026 00:40:29 -0400
Subject: [PATCH] Speed up legacy implementation of std::invoke() by 50%
---
libcxx/include/__functional/invoke.h | 27 +-
libcxx/include/__type_traits/invoke.h | 375 +++++++++++---------------
2 files changed, 186 insertions(+), 216 deletions(-)
diff --git a/libcxx/include/__functional/invoke.h b/libcxx/include/__functional/invoke.h
index f7d6a23a4e520..d8c68a2f97cb0 100644
--- a/libcxx/include/__functional/invoke.h
+++ b/libcxx/include/__functional/invoke.h
@@ -14,6 +14,7 @@
#include <__type_traits/invoke.h>
#include <__type_traits/is_void.h>
#include <__utility/forward.h>
+#include <__utility/declval.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
@@ -23,11 +24,29 @@
_LIBCPP_BEGIN_NAMESPACE_STD
-template <class _Fn, class... _Args>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 invoke_result_t<_Fn, _Args...>
-invoke(_Fn&& __f, _Args&&... __args) noexcept(is_nothrow_invocable_v<_Fn, _Args...>) {
- return std::__invoke(std::forward<_Fn>(__f), std::forward<_Args>(__args)...);
+# if __has_builtin(__builtin_invoke)
+template <class... _Args>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 decltype(__builtin_invoke(std::declval<_Args>()...))
+invoke(_Args&&... __args) noexcept(noexcept(__builtin_invoke(std::declval<_Args>()...))) {
+ return __builtin_invoke(std::forward<_Args>(__args)...);
}
+# else
+template <class _Fp, class... _Args>
+_LIBCPP_HIDE_FROM_ABI
+_LIBCPP_CONSTEXPR decltype(std::declval<_Fp>()(std::declval<_Args>()...)) invoke(_Fp&& __f, _Args&&... __args)
+ _NOEXCEPT_(noexcept(std::declval<_Fp>()(std::declval<_Args>()...))) {
+ return static_cast<_Fp&&>(__f)(static_cast<_Args&&>(__args)...);
+}
+
+template <class _Member, class _Class, class _A0, class... _Args>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR decltype(std::__invoker_t<_Member, _Class, _A0>::_Fn(
+ std::declval<_Member _Class::*>(), std::declval<_A0>(), std::declval<_Args>()...))
+invoke(_Member _Class::* __f, _A0&& __a0, _Args&&... __args)
+ _NOEXCEPT_(noexcept(std::__invoker_t<_Member, _Class, _A0>::_Fn(
+ std::declval<_Member _Class::*>(), std::declval<_A0>(), std::declval<_Args>()...))) {
+ return std::__invoker_t<_Member, _Class, _A0>::_Fn(__f, static_cast<_A0&&>(__a0), static_cast<_Args&&>(__args)...);
+}
+# endif
# if _LIBCPP_STD_VER >= 23
template <class _Result, class _Fn, class... _Args>
diff --git a/libcxx/include/__type_traits/invoke.h b/libcxx/include/__type_traits/invoke.h
index ba8202576593e..067888951f49c 100644
--- a/libcxx/include/__type_traits/invoke.h
+++ b/libcxx/include/__type_traits/invoke.h
@@ -17,11 +17,14 @@
#include <__type_traits/integral_constant.h>
#include <__type_traits/is_base_of.h>
#include <__type_traits/is_core_convertible.h>
-#include <__type_traits/is_member_pointer.h>
+#include <__type_traits/is_function.h>
#include <__type_traits/is_reference_wrapper.h>
#include <__type_traits/is_same.h>
#include <__type_traits/is_void.h>
#include <__type_traits/nat.h>
+#include <__type_traits/remove_cvref.h>
+#include <__type_traits/remove_reference.h>
+#include <__type_traits/type_identity.h>
#include <__type_traits/void_t.h>
#include <__utility/declval.h>
#include <__utility/forward.h>
@@ -55,10 +58,10 @@
// 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...>;
+// struct __is_nothrow_invocable_r : is_nothrow_invocable_r<Func, Args...> {};
//
// template <class Func, class... Args>
-// struct __invoke_result : invoke_result {};
+// struct __invoke_result : invoke_result<Func, Args...> {};
//
// template <class Func, class... Args>
// using __invoke_result_t = invoke_result_t<Func, Args...>;
@@ -70,19 +73,8 @@ _LIBCPP_BEGIN_NAMESPACE_STD
#if __has_builtin(__builtin_invoke)
-template <class, class... _Args>
-struct __invoke_result_impl {};
-
template <class... _Args>
-struct __invoke_result_impl<__void_t<decltype(__builtin_invoke(std::declval<_Args>()...))>, _Args...> {
- using type _LIBCPP_NODEBUG = decltype(__builtin_invoke(std::declval<_Args>()...));
-};
-
-template <class... _Args>
-using __invoke_result _LIBCPP_NODEBUG = __invoke_result_impl<void, _Args...>;
-
-template <class... _Args>
-using __invoke_result_t _LIBCPP_NODEBUG = typename __invoke_result<_Args...>::type;
+using __invoke_result_t _LIBCPP_NODEBUG = decltype(__builtin_invoke(std::declval<_Args>()...));
template <class... _Args>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR __invoke_result_t<_Args...> __invoke(_Args&&... __args)
@@ -97,10 +89,10 @@ template <class... _Args>
inline const bool __is_invocable_impl<__void_t<__invoke_result_t<_Args...> >, _Args...> = true;
template <class... _Args>
-inline const bool __is_invocable_v = __is_invocable_impl<void, _Args...>;
+_LIBCPP_NO_SPECIALIZATIONS inline const bool __is_invocable_v = __is_invocable_impl<void, _Args...>;
template <class... _Args>
-struct __is_invocable : integral_constant<bool, __is_invocable_v<_Args...> > {};
+using __is_invocable _LIBCPP_NODEBUG = _BoolConstant<__is_invocable_v<_Args...> >;
template <class _Ret, bool, class... _Args>
inline const bool __is_invocable_r_impl = false;
@@ -110,18 +102,20 @@ inline const bool __is_invocable_r_impl<_Ret, true, _Args...> =
__is_core_convertible<__invoke_result_t<_Args...>, _Ret>::value || is_void<_Ret>::value;
template <class _Ret, class... _Args>
-inline const bool __is_invocable_r_v = __is_invocable_r_impl<_Ret, __is_invocable_v<_Args...>, _Args...>;
+_LIBCPP_NO_SPECIALIZATIONS inline const bool __is_invocable_r_v =
+ __is_invocable_r_impl<_Ret, __is_invocable_v<_Args...>, _Args...>;
-template <bool __is_invocable, class... _Args>
+template <class _Void, class... _Args>
inline const bool __is_nothrow_invocable_impl = false;
# ifndef _LIBCPP_CXX03_LANG
template <class... _Args>
-inline const bool __is_nothrow_invocable_impl<true, _Args...> = noexcept(__builtin_invoke(std::declval<_Args>()...));
+inline const bool
+ __is_nothrow_invocable_impl<__enable_if_t<noexcept(__builtin_invoke(std::declval<_Args>()...))>, _Args...> = true;
# endif
template <class... _Args>
-inline const bool __is_nothrow_invocable_v = __is_nothrow_invocable_impl<__is_invocable_v<_Args...>, _Args...>;
+_LIBCPP_NO_SPECIALIZATIONS inline const bool __is_nothrow_invocable_v = __is_nothrow_invocable_impl<void, _Args...>;
template <bool __is_invocable, class _Ret, class... _Args>
inline const bool __is_nothrow_invocable_r_impl = false;
@@ -131,229 +125,186 @@ inline const bool __is_nothrow_invocable_r_impl<true, _Ret, _Args...> =
__is_nothrow_core_convertible_v<__invoke_result_t<_Args...>, _Ret> || is_void<_Ret>::value;
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...>;
+using __is_nothrow_invocable_r _LIBCPP_NODEBUG =
+ _BoolConstant<__is_nothrow_invocable_r_impl<__is_nothrow_invocable_v<_Args...>, _Ret, _Args...> >;
#else // __has_builtin(__builtin_invoke)
-template <class _DecayedFp>
-struct __member_pointer_class_type {};
+// The _Kind is the bullet number in the standard
+template <unsigned _Kind>
+struct _Invoker;
-template <class _Ret, class _ClassType>
-struct __member_pointer_class_type<_Ret _ClassType::*> {
- typedef _ClassType type;
-};
-
-template <class _Fp,
- class _A0,
- class _DecayFp = __decay_t<_Fp>,
- class _DecayA0 = __decay_t<_A0>,
- class _ClassT = typename __member_pointer_class_type<_DecayFp>::type>
-using __enable_if_bullet1 _LIBCPP_NODEBUG =
- __enable_if_t<is_member_function_pointer<_DecayFp>::value &&
- (is_same<_ClassT, _DecayA0>::value || is_base_of<_ClassT, _DecayA0>::value)>;
-
-template <class _Fp, class _A0, class _DecayFp = __decay_t<_Fp>, class _DecayA0 = __decay_t<_A0> >
-using __enable_if_bullet2 _LIBCPP_NODEBUG =
- __enable_if_t<is_member_function_pointer<_DecayFp>::value && __is_reference_wrapper<_DecayA0>::value>;
-
-template <class _Fp,
- class _A0,
- class _DecayFp = __decay_t<_Fp>,
- class _DecayA0 = __decay_t<_A0>,
- class _ClassT = typename __member_pointer_class_type<_DecayFp>::type>
-using __enable_if_bullet3 _LIBCPP_NODEBUG =
- __enable_if_t<is_member_function_pointer<_DecayFp>::value &&
- !(is_same<_ClassT, _DecayA0>::value || is_base_of<_ClassT, _DecayA0>::value) &&
- !__is_reference_wrapper<_DecayA0>::value>;
-
-template <class _Fp,
- class _A0,
- class _DecayFp = __decay_t<_Fp>,
- class _DecayA0 = __decay_t<_A0>,
- class _ClassT = typename __member_pointer_class_type<_DecayFp>::type>
-using __enable_if_bullet4 _LIBCPP_NODEBUG =
- __enable_if_t<is_member_object_pointer<_DecayFp>::value &&
- (is_same<_ClassT, _DecayA0>::value || is_base_of<_ClassT, _DecayA0>::value)>;
-
-template <class _Fp, class _A0, class _DecayFp = __decay_t<_Fp>, class _DecayA0 = __decay_t<_A0> >
-using __enable_if_bullet5 _LIBCPP_NODEBUG =
- __enable_if_t<is_member_object_pointer<_DecayFp>::value && __is_reference_wrapper<_DecayA0>::value>;
-
-template <class _Fp,
+template <class _Member,
+ class _Class,
class _A0,
- class _DecayFp = __decay_t<_Fp>,
- class _DecayA0 = __decay_t<_A0>,
- class _ClassT = typename __member_pointer_class_type<_DecayFp>::type>
-using __enable_if_bullet6 _LIBCPP_NODEBUG =
- __enable_if_t<is_member_object_pointer<_DecayFp>::value &&
- !(is_same<_ClassT, _DecayA0>::value || is_base_of<_ClassT, _DecayA0>::value) &&
- !__is_reference_wrapper<_DecayA0>::value>;
+ class _DecayA0 = __decay_t<_A0>,
+ class _IsRefWrapper = __is_reference_wrapper<_DecayA0> >
+using __invoker_t _LIBCPP_NODEBUG = _Invoker<
+ (!is_function<_Member>::value * 3) +
+ (!_If<
+ _IsRefWrapper::value,
+ false_type,
+ _If<is_same<_Class, _DecayA0>::value, is_same<_Class, _DecayA0>, is_base_of<_Class, _DecayA0> > >::value
+ << 1) +
+ !_IsRefWrapper::value>;
-// __invoke forward declarations
-
-// fall back - none of the bullets
+// bullets 1, 2 and 3
-template <class... _Args>
-__nat __invoke(_Args&&... __args);
+template <>
+struct _Invoker<1> {
+ template <class _Fp, class _A0, class... _Args>
+ static inline _LIBCPP_HIDE_FROM_ABI
+ _LIBCPP_CONSTEXPR decltype((std::declval<_A0>().*std::declval<_Fp>())(std::declval<_Args>()...))
+ _Fn(_Fp __f, _A0&& __a0, _Args&&... __args)
+ _NOEXCEPT_(noexcept((std::declval<_A0>().*std::declval<_Fp>())(std::declval<_Args>()...))) {
+ return (static_cast<_A0&&>(__a0).*__f)(static_cast<_Args&&>(__args)...);
+ }
+};
-// bullets 1, 2 and 3
+template <>
+struct _Invoker<2> {
+ template <class _Fp, class _A0, class... _Args>
+ static inline _LIBCPP_HIDE_FROM_ABI
+ _LIBCPP_CONSTEXPR decltype((std::declval<_A0&>().*std::declval<_Fp>())(std::declval<_Args>()...))
+ _Fn(_Fp __f, reference_wrapper<_A0> __a0, _Args&&... __args)
+ _NOEXCEPT_(noexcept((std::declval<_A0&>().*std::declval<_Fp>())(std::declval<_Args>()...))) {
+ return (__a0.get().*__f)(static_cast<_Args&&>(__args)...);
+ }
+};
-// clang-format off
-template <class _Fp, class _A0, class... _Args, class = __enable_if_bullet1<_Fp, _A0> >
-inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
-decltype((std::declval<_A0>().*std::declval<_Fp>())(std::declval<_Args>()...))
-__invoke(_Fp&& __f, _A0&& __a0, _Args&&... __args)
- _NOEXCEPT_(noexcept((static_cast<_A0&&>(__a0).*__f)(static_cast<_Args&&>(__args)...)))
- { return (static_cast<_A0&&>(__a0).*__f)(static_cast<_Args&&>(__args)...); }
-
-template <class _Fp, class _A0, class... _Args, class = __enable_if_bullet2<_Fp, _A0> >
-inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
-decltype((std::declval<_A0>().get().*std::declval<_Fp>())(std::declval<_Args>()...))
-__invoke(_Fp&& __f, _A0&& __a0, _Args&&... __args)
- _NOEXCEPT_(noexcept((__a0.get().*__f)(static_cast<_Args&&>(__args)...)))
- { return (__a0.get().*__f)(static_cast<_Args&&>(__args)...); }
-
-template <class _Fp, class _A0, class... _Args, class = __enable_if_bullet3<_Fp, _A0> >
-inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
-decltype(((*std::declval<_A0>()).*std::declval<_Fp>())(std::declval<_Args>()...))
-__invoke(_Fp&& __f, _A0&& __a0, _Args&&... __args)
- _NOEXCEPT_(noexcept(((*static_cast<_A0&&>(__a0)).*__f)(static_cast<_Args&&>(__args)...)))
- { return ((*static_cast<_A0&&>(__a0)).*__f)(static_cast<_Args&&>(__args)...); }
+template <>
+struct _Invoker<3> {
+ template <class _Fp, class _A0, class... _Args>
+ static inline _LIBCPP_HIDE_FROM_ABI
+ _LIBCPP_CONSTEXPR decltype(((*std::declval<_A0>()).*std::declval<_Fp>())(std::declval<_Args>()...))
+ _Fn(_Fp __f, _A0&& __a0, _Args&&... __args)
+ _NOEXCEPT_(noexcept(((*std::declval<_A0>()).*std::declval<_Fp>())(std::declval<_Args>()...))) {
+ return ((*static_cast<_A0&&>(__a0)).*__f)(static_cast<_Args&&>(__args)...);
+ }
+};
// bullets 4, 5 and 6
-template <class _Fp, class _A0, class = __enable_if_bullet4<_Fp, _A0> >
-inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
-decltype(std::declval<_A0>().*std::declval<_Fp>())
-__invoke(_Fp&& __f, _A0&& __a0)
- _NOEXCEPT_(noexcept(static_cast<_A0&&>(__a0).*__f))
- { return static_cast<_A0&&>(__a0).*__f; }
-
-template <class _Fp, class _A0, class = __enable_if_bullet5<_Fp, _A0> >
-inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
-decltype(std::declval<_A0>().get().*std::declval<_Fp>())
-__invoke(_Fp&& __f, _A0&& __a0)
- _NOEXCEPT_(noexcept(__a0.get().*__f))
- { return __a0.get().*__f; }
-
-template <class _Fp, class _A0, class = __enable_if_bullet6<_Fp, _A0> >
-inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
-decltype((*std::declval<_A0>()).*std::declval<_Fp>())
-__invoke(_Fp&& __f, _A0&& __a0)
- _NOEXCEPT_(noexcept((*static_cast<_A0&&>(__a0)).*__f))
- { return (*static_cast<_A0&&>(__a0)).*__f; }
-
-// bullet 7
+template <>
+struct _Invoker<4> {
+ template <class _Fp, class _A0>
+ static inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR decltype(std::declval<_A0>().*std::declval<_Fp>())
+ _Fn(_Fp __f, _A0&& __a0) _NOEXCEPT_(noexcept(std::declval<_A0>().*std::declval<_Fp>())) {
+ return static_cast<_A0&&>(__a0).*__f;
+ }
+};
-template <class _Fp, class... _Args>
-inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
-decltype(std::declval<_Fp>()(std::declval<_Args>()...))
-__invoke(_Fp&& __f, _Args&&... __args)
- _NOEXCEPT_(noexcept(static_cast<_Fp&&>(__f)(static_cast<_Args&&>(__args)...)))
- { return static_cast<_Fp&&>(__f)(static_cast<_Args&&>(__args)...); }
-// clang-format on
-
-// __invokable
-template <class _Ret, class _Fp, class... _Args>
-struct __invokable_r {
- template <class _XFp, class... _XArgs>
- static decltype(std::__invoke(std::declval<_XFp>(), std::declval<_XArgs>()...)) __try_call(int);
- template <class _XFp, class... _XArgs>
- static __nat __try_call(...);
-
- // FIXME: Check that _Ret, _Fp, and _Args... are all complete types, cv void,
- // or incomplete array types as required by the standard.
- using _Result _LIBCPP_NODEBUG = decltype(__try_call<_Fp, _Args...>(0));
-
- using type = __conditional_t<_IsNotSame<_Result, __nat>::value,
- __conditional_t<is_void<_Ret>::value, true_type, __is_core_convertible<_Result, _Ret> >,
- false_type>;
- static const bool value = type::value;
+template <>
+struct _Invoker<5> {
+ template <class _Fp, class _A0>
+ static inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR decltype(std::declval<_A0&>().*std::declval<_Fp>())
+ _Fn(_Fp __f, reference_wrapper<_A0> __a0) _NOEXCEPT_(noexcept(std::declval<_A0&>().*std::declval<_Fp>())) {
+ return __a0.get().*__f;
+ }
};
-template <class _Fp, class... _Args>
-using __is_invocable _LIBCPP_NODEBUG = __invokable_r<void, _Fp, _Args...>;
-template <bool _IsInvokable, bool _IsCVVoid, class _Ret, class _Fp, class... _Args>
-struct __nothrow_invokable_r_imp {
- static const bool value = false;
+template <>
+struct _Invoker<6> {
+ template <class _Fp, class _A0>
+ static inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR decltype((*std::declval<_A0>()).*std::declval<_Fp>())
+ _Fn(_Fp __f, _A0&& __a0) _NOEXCEPT_(noexcept((*std::declval<_A0>()).*std::declval<_Fp>())) {
+ return (*static_cast<_A0&&>(__a0)).*__f;
+ }
};
-template <class _Ret, class _Fp, class... _Args>
-struct __nothrow_invokable_r_imp<true, false, _Ret, _Fp, _Args...> {
- typedef __nothrow_invokable_r_imp _ThisT;
+template <class _Fp, class... _Args>
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR decltype(std::declval<_Fp>()(std::declval<_Args>()...))
+__invoke(_Fp&& __f, _Args&&... __args) _NOEXCEPT_(noexcept(std::declval<_Fp>()(std::declval<_Args>()...))) {
+ return static_cast<_Fp&&>(__f)(static_cast<_Args&&>(__args)...);
+}
- template <class _Tp>
- static void __test_noexcept(_Tp) _NOEXCEPT;
+template <class _Member, class _Class, class _A0, class... _Args>
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR decltype(std::__invoker_t<_Member, _Class, _A0>::_Fn(
+ std::declval<_Member _Class::*>(), std::declval<_A0>(), std::declval<_Args>()...))
+__invoke(_Member _Class::* __f, _A0&& __a0, _Args&&... __args)
+ _NOEXCEPT_(noexcept(std::__invoker_t<_Member, _Class, _A0>::_Fn(
+ std::declval<_Member _Class::*>(), std::declval<_A0>(), std::declval<_Args>()...))) {
+ return std::__invoker_t<_Member, _Class, _A0>::_Fn(__f, static_cast<_A0&&>(__a0), static_cast<_Args&&>(__args)...);
+}
-# ifdef _LIBCPP_CXX03_LANG
- static const bool value = false;
-# else
- static const bool value =
- noexcept(_ThisT::__test_noexcept<_Ret>(std::__invoke(std::declval<_Fp>(), std::declval<_Args>()...)));
-# endif
-};
+template <class... _Args>
+using __invoke_result_t _LIBCPP_NODEBUG = decltype(std::__invoke(std::declval<_Args>()...));
-template <class _Ret, class _Fp, class... _Args>
-struct __nothrow_invokable_r_imp<true, true, _Ret, _Fp, _Args...> {
-# ifdef _LIBCPP_CXX03_LANG
- static const bool value = false;
-# else
- static const bool value = noexcept(std::__invoke(std::declval<_Fp>(), std::declval<_Args>()...));
-# endif
-};
+template <class _Void, class _Ret, class... _Args>
+inline const bool __is_invocable_r_impl = false;
template <class _Ret, class _Fp, class... _Args>
-using __nothrow_invokable_r _LIBCPP_NODEBUG =
- __nothrow_invokable_r_imp<__invokable_r<_Ret, _Fp, _Args...>::value, is_void<_Ret>::value, _Ret, _Fp, _Args...>;
+inline const bool __is_invocable_r_impl<decltype(void(std::__invoke(std::declval<_Fp>(), std::declval<_Args>()...))),
+ _Ret,
+ _Fp,
+ _Args...> =
+ is_void<_Ret>::value || __is_core_convertible<__invoke_result_t<_Fp, _Args...>, _Ret>::value;
-template <class _Fp, class... _Args>
-using __nothrow_invokable _LIBCPP_NODEBUG =
- __nothrow_invokable_r_imp<__is_invocable<_Fp, _Args...>::value, true, void, _Fp, _Args...>;
+template <class... _Args>
+_LIBCPP_NO_SPECIALIZATIONS inline const bool __is_invocable_r_v = __is_invocable_r_impl<void, _Args...>;
-template <class _Func, class... _Args>
-inline const bool __is_invocable_v = __is_invocable<_Func, _Args...>::value;
+template <class... _Args>
+_LIBCPP_NO_SPECIALIZATIONS inline const bool __is_invocable_v = __is_invocable_r_v<void, _Args...>;
+
+template <class... _Args>
+using __is_invocable _LIBCPP_NODEBUG = _BoolConstant<__is_invocable_v<_Args...> >;
+
+template <class _Void, class... _Args>
+inline const bool __is_nothrow_invocable_impl = false;
+
+template <class _Fp, class... _Args>
+inline const bool
+ __is_nothrow_invocable_impl<__enable_if_t<noexcept(std::__invoke(std::declval<_Fp>(), std::declval<_Args>()...))>,
+ _Fp,
+ _Args...> = true;
-template <class _Ret, class _Func, class... _Args>
-inline const bool __is_invocable_r_v = __invokable_r<_Ret, _Func, _Args...>::value;
+template <class... _Args>
+_LIBCPP_NO_SPECIALIZATIONS inline const bool __is_nothrow_invocable_v = __is_nothrow_invocable_impl<void, _Args...>;
-template <class _Func, class... _Args>
-inline const bool __is_nothrow_invocable_v = __nothrow_invokable<_Func, _Args...>::value;
+template <class _Void, class _Ret, class... _Args>
+inline const bool __nothrow_invocable_r_imp = false;
-template <class _Ret, class _Func, class... _Args>
-inline const bool __is_nothrow_invocable_r_v = __nothrow_invokable_r<_Ret, _Func, _Args...>::value;
+template <class _Ret, class _Fp, class... _Args>
+inline const bool __nothrow_invocable_r_imp<
+ __enable_if_t<noexcept(static_cast<void (*)(_Ret) _NOEXCEPT>(nullptr)(
+ std::__invoke(std::declval<__enable_if_t<!is_void<_Ret>::value, _Fp> >(), std::declval<_Args>()...)))>,
+ _Ret,
+ _Fp,
+ _Args...> = true;
-template <class _Func, class... _Args>
-struct __invoke_result
- : enable_if<__is_invocable_v<_Func, _Args...>, typename __invokable_r<void, _Func, _Args...>::_Result> {};
+template <class... _Args>
+inline const bool __nothrow_invocable_r_imp<__enable_if_t<__is_nothrow_invocable_v<_Args...> >, void, _Args...> = true;
-template <class _Func, class... _Args>
-using __invoke_result_t _LIBCPP_NODEBUG = typename __invoke_result<_Func, _Args...>::type;
+template <class _Ret, class... _Args>
+using __is_nothrow_invocable_r _LIBCPP_NODEBUG =
+ _BoolConstant<__nothrow_invocable_r_imp<void, _If<is_void<_Ret>::value, void, _Ret>, _Args...> >;
-#endif // __has_builtin(__builtin_invoke_r)
+#endif // __has_builtin(__builtin_invoke)
-template <class _Ret, class _Func, class... _Args>
-struct __is_invocable_r : integral_constant<bool, __is_invocable_r_v<_Ret, _Func, _Args...> > {};
+template <class _Void, class... _Args>
+struct __invoke_result_impl {};
-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... _Args>
+struct __invoke_result_impl<__void_t<__invoke_result_t<_Args...> >, _Args...> {
+ using type _LIBCPP_NODEBUG = __invoke_result_t<_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... _Args>
+using __invoke_result _LIBCPP_NODEBUG = __invoke_result_impl<void, _Args...>;
+
+template <class... _Args>
+using __is_invocable_r _LIBCPP_NODEBUG = _BoolConstant<__is_invocable_r_v<_Args...> >;
+
+template <class _Ret, class... _Args>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __enable_if_t<!is_void<_Ret>::value, _Ret>
+__invoke_r(_Args&&... __args) {
+ return 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)...);
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __enable_if_t<is_void<_Ret>::value, _Ret>
+__invoke_r(_Args&&... __args) {
+ std::__invoke(std::forward<_Args>(__args)...);
}
#if _LIBCPP_STD_VER >= 17
@@ -364,7 +315,7 @@ 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...>> {};
+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...>;
@@ -379,20 +330,20 @@ struct _LIBCPP_NO_SPECIALIZATIONS is_nothrow_invocable : bool_constant<__is_noth
template <class _Ret, class _Fn, class... _Args>
struct _LIBCPP_NO_SPECIALIZATIONS is_nothrow_invocable_r
- : bool_constant<__is_nothrow_invocable_r_v<_Ret, _Fn, _Args...>> {};
+ : bool_constant<__is_nothrow_invocable_r<_Ret, _Fn, _Args...>::value> {};
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...>;
+ __is_nothrow_invocable_r<_Ret, _Fn, _Args...>::value;
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...>;
+using invoke_result_t = typename invoke_result<_Fn, _Args...>::type;
#endif
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