// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___TYPE_TRAITS_INVOKE_H
#define _LIBCPP___TYPE_TRAITS_INVOKE_H
#include <__config>
#include <__type_traits/conditional.h>
#include <__type_traits/decay.h>
#include <__type_traits/enable_if.h>
#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_reference_wrapper.h>
#include <__type_traits/is_same.h>
#include <__type_traits/is_void.h>
#include <__type_traits/nat.h>
#include <__utility/declval.h>
#include <__utility/forward.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _DecayedFp>
struct __member_pointer_class_type {};
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 =
__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 =
__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 =
__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 =
__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 =
__enable_if_t<is_member_object_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_bullet6 =
__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>;
// __invoke forward declarations
// fall back - none of the bullets
template <class... _Args>
__nat __invoke(_Args&&... __args);
// bullets 1, 2 and 3
// 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)...); }
// 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 <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 = 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 <class _Fp, class... _Args>
using __invokable = __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 <class _Ret, class _Fp, class... _Args>
struct __nothrow_invokable_r_imp<true, false, _Ret, _Fp, _Args...> {
typedef __nothrow_invokable_r_imp _ThisT;
template <class _Tp>
static void __test_noexcept(_Tp) _NOEXCEPT;
#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 _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 _Ret, class _Fp, class... _Args>
using __nothrow_invokable_r =
__nothrow_invokable_r_imp<__invokable_r<_Ret, _Fp, _Args...>::value, is_void<_Ret>::value, _Ret, _Fp, _Args...>;
template <class _Fp, class... _Args>
using __nothrow_invokable = __nothrow_invokable_r_imp<__invokable<_Fp, _Args...>::value, true, void, _Fp, _Args...>;
template <class _Fp, class... _Args>
struct __invoke_of
: public enable_if<__invokable<_Fp, _Args...>::value, typename __invokable_r<void, _Fp, _Args...>::_Result> {};
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)...);
}
};
#if _LIBCPP_STD_VER >= 17
// is_invocable
template <class _Fn, class... _Args>
struct _LIBCPP_TEMPLATE_VIS is_invocable : integral_constant<bool, __invokable<_Fn, _Args...>::value> {};
template <class _Ret, class _Fn, class... _Args>
struct _LIBCPP_TEMPLATE_VIS is_invocable_r : integral_constant<bool, __invokable_r<_Ret, _Fn, _Args...>::value> {};
template <class _Fn, class... _Args>
inline constexpr bool is_invocable_v = is_invocable<_Fn, _Args...>::value;
template <class _Ret, class _Fn, class... _Args>
inline constexpr bool is_invocable_r_v = is_invocable_r<_Ret, _Fn, _Args...>::value;
// is_nothrow_invocable
template <class _Fn, class... _Args>
struct _LIBCPP_TEMPLATE_VIS is_nothrow_invocable : integral_constant<bool, __nothrow_invokable<_Fn, _Args...>::value> {
};
template <class _Ret, class _Fn, class... _Args>
struct _LIBCPP_TEMPLATE_VIS is_nothrow_invocable_r
: integral_constant<bool, __nothrow_invokable_r<_Ret, _Fn, _Args...>::value> {};
template <class _Fn, class... _Args>
inline constexpr bool is_nothrow_invocable_v = is_nothrow_invocable<_Fn, _Args...>::value;
template <class _Ret, class _Fn, class... _Args>
inline constexpr bool is_nothrow_invocable_r_v = is_nothrow_invocable_r<_Ret, _Fn, _Args...>::value;
template <class _Fn, class... _Args>
struct _LIBCPP_TEMPLATE_VIS invoke_result : __invoke_of<_Fn, _Args...> {};
template <class _Fn, class... _Args>
using invoke_result_t = typename invoke_result<_Fn, _Args...>::type;
#endif // _LIBCPP_STD_VER >= 17
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___TYPE_TRAITS_INVOKE_H
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