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[libc] Add invoke #65753
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[libc] Add invoke #65753
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| //===-- invoke type_traits --------------------------------------*- 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 LLVM_LIBC_SRC_SUPPORT_CPP_TYPE_TRAITS_INVOKE_H | ||
| #define LLVM_LIBC_SRC_SUPPORT_CPP_TYPE_TRAITS_INVOKE_H | ||
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| #include "src/__support/CPP/type_traits/decay.h" | ||
| #include "src/__support/CPP/type_traits/invoke_result.h" | ||
| #include "src/__support/CPP/type_traits/is_base_of.h" | ||
| #include "src/__support/CPP/type_traits/is_function.h" | ||
| #include "src/__support/CPP/type_traits/is_member_pointer.h" | ||
| #include "src/__support/CPP/type_traits/is_object.h" | ||
| #include "src/__support/CPP/utility/forward.h" | ||
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| // BEWARE : this implementation is not fully conformant as it doesn't take | ||
| // `cpp::reference_wrapper` into account. It also bypasses noexcept detection. | ||
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| namespace __llvm_libc::cpp { | ||
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| // invoke | ||
| namespace detail { | ||
| template <class> constexpr bool is_reference_wrapper_v = false; | ||
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| // Disable specialization on `cpp::reference_wrapper` as it is not yet | ||
| // implemented. | ||
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| // template <class U> | ||
| // constexpr bool is_reference_wrapper_v<cpp::reference_wrapper<U>> = true; | ||
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| template <class C, class Pointed, class T1, class... Args> | ||
| constexpr decltype(auto) invoke_memptr(Pointed C::*f, T1 &&t1, Args &&...args) { | ||
| if constexpr (cpp::is_function_v<Pointed>) { | ||
| if constexpr (cpp::is_base_of_v<C, cpp::decay_t<T1>>) | ||
| return (cpp::forward<T1>(t1).*f)(cpp::forward<Args>(args)...); | ||
| else if constexpr (is_reference_wrapper_v<cpp::decay_t<T1>>) | ||
| return (t1.get().*f)(cpp::forward<Args>(args)...); | ||
| else | ||
| return ((*cpp::forward<T1>(t1)).*f)(cpp::forward<Args>(args)...); | ||
| } else { | ||
| static_assert(cpp::is_object_v<Pointed> && sizeof...(args) == 0); | ||
| if constexpr (cpp::is_base_of_v<C, cpp::decay_t<T1>>) | ||
| return cpp::forward<T1>(t1).*f; | ||
| else if constexpr (is_reference_wrapper_v<cpp::decay_t<T1>>) | ||
| return t1.get().*f; | ||
| else | ||
| return (*cpp::forward<T1>(t1)).*f; | ||
| } | ||
| } | ||
| } // namespace detail | ||
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| template <class F, class... Args> | ||
| constexpr cpp::invoke_result_t<F, Args...> invoke(F &&f, Args &&...args) { | ||
| if constexpr (cpp::is_member_pointer_v<cpp::decay_t<F>>) | ||
| return detail::invoke_memptr(f, cpp::forward<Args>(args)...); | ||
| else | ||
| return cpp::forward<F>(f)(cpp::forward<Args>(args)...); | ||
| } | ||
| } // namespace __llvm_libc::cpp | ||
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| #endif // LLVM_LIBC_SRC_SUPPORT_CPP_TYPE_TRAITS_INVOKE_H |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| //===-- invoke_result type_traits -------------------------------*- 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 LLVM_LIBC_SRC_SUPPORT_CPP_TYPE_TRAITS_INVOKE_RESULT_H | ||
| #define LLVM_LIBC_SRC_SUPPORT_CPP_TYPE_TRAITS_INVOKE_RESULT_H | ||
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| #include "src/__support/CPP/type_traits/decay.h" | ||
| #include "src/__support/CPP/type_traits/enable_if.h" | ||
| #include "src/__support/CPP/type_traits/false_type.h" | ||
| #include "src/__support/CPP/type_traits/is_base_of.h" | ||
| #include "src/__support/CPP/type_traits/is_function.h" | ||
| #include "src/__support/CPP/type_traits/true_type.h" | ||
| #include "src/__support/CPP/utility/declval.h" | ||
| #include "src/__support/CPP/utility/forward.h" | ||
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| // BEWARE : this implementation is not fully conformant as it doesn't take | ||
| // `cpp::reference_wrapper` into account. | ||
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| namespace __llvm_libc::cpp { | ||
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| // invoke_result | ||
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| namespace detail { | ||
| template <class T> struct is_reference_wrapper : cpp::false_type {}; | ||
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| // Disable specialization on `cpp::reference_wrapper` as it is not yet | ||
| // implemented. | ||
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| // template <class U> struct | ||
| // is_reference_wrapper<cpp::reference_wrapper<U>> : cpp::true_type {}; | ||
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| template <class T> struct invoke_impl { | ||
| template <class F, class... Args> | ||
| static auto call(F &&f, Args &&...args) | ||
| -> decltype(cpp::forward<F>(f)(cpp::forward<Args>(args)...)); | ||
| }; | ||
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| template <class B, class MT> struct invoke_impl<MT B::*> { | ||
| template <class T, class Td = cpp::decay_t<T>, | ||
| class = cpp::enable_if_t<cpp::is_base_of_v<B, Td>>> | ||
| static auto get(T &&t) -> T &&; | ||
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| template <class T, class Td = cpp::decay_t<T>, | ||
| class = cpp::enable_if_t<is_reference_wrapper<Td>::value>> | ||
| static auto get(T &&t) -> decltype(t.get()); | ||
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| template <class T, class Td = cpp::decay_t<T>, | ||
| class = cpp::enable_if_t<!cpp::is_base_of_v<B, Td>>, | ||
| class = cpp::enable_if_t<!is_reference_wrapper<Td>::value>> | ||
| static auto get(T &&t) -> decltype(*cpp::forward<T>(t)); | ||
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| template <class T, class... Args, class MT1, | ||
| class = cpp::enable_if_t<cpp::is_function_v<MT1>>> | ||
| static auto call(MT1 B::*pmf, T &&t, Args &&...args) | ||
| -> decltype((invoke_impl::get(cpp::forward<T>(t)).* | ||
| pmf)(cpp::forward<Args>(args)...)); | ||
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| template <class T> | ||
| static auto call(MT B::*pmd, T &&t) | ||
| -> decltype(invoke_impl::get(cpp::forward<T>(t)).*pmd); | ||
| }; | ||
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| template <class F, class... Args, class Fd = typename cpp::decay_t<F>> | ||
| auto INVOKE(F &&f, Args &&...args) | ||
| -> decltype(invoke_impl<Fd>::call(cpp::forward<F>(f), | ||
| cpp::forward<Args>(args)...)); | ||
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| template <typename AlwaysVoid, typename, typename...> struct invoke_result {}; | ||
| template <typename F, typename... Args> | ||
| struct invoke_result<decltype(void(detail::INVOKE(cpp::declval<F>(), | ||
| cpp::declval<Args>()...))), | ||
| F, Args...> { | ||
| using type = | ||
| decltype(detail::INVOKE(cpp::declval<F>(), cpp::declval<Args>()...)); | ||
| }; | ||
| } // namespace detail | ||
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| template <class F, class... ArgTypes> | ||
| struct invoke_result : detail::invoke_result<void, F, ArgTypes...> {}; | ||
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| template <class F, class... ArgTypes> | ||
| using invoke_result_t = typename invoke_result<F, ArgTypes...>::type; | ||
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| } // namespace __llvm_libc::cpp | ||
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| #endif // LLVM_LIBC_SRC_SUPPORT_CPP_TYPE_TRAITS_INVOKE_RESULT_H | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| //===-- is_object type_traits -----------------------------------*- 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 LLVM_LIBC_SRC_SUPPORT_CPP_TYPE_TRAITS_IS_OBJECT_H | ||
| #define LLVM_LIBC_SRC_SUPPORT_CPP_TYPE_TRAITS_IS_OBJECT_H | ||
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| #include "src/__support/CPP/type_traits/bool_constant.h" | ||
| #include "src/__support/CPP/type_traits/is_array.h" | ||
| #include "src/__support/CPP/type_traits/is_class.h" | ||
| #include "src/__support/CPP/type_traits/is_scalar.h" | ||
| #include "src/__support/CPP/type_traits/is_union.h" | ||
| #include "src/__support/macros/attributes.h" | ||
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| namespace __llvm_libc::cpp { | ||
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| // is_object | ||
| template <class T> | ||
| struct is_object | ||
| : cpp::bool_constant<cpp::is_scalar_v<T> || cpp::is_array_v<T> || | ||
| cpp::is_union_v<T> || cpp::is_class_v<T>> {}; | ||
| template <class T> | ||
| LIBC_INLINE_VAR constexpr bool is_object_v = is_object<T>::value; | ||
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| } // namespace __llvm_libc::cpp | ||
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| #endif // LLVM_LIBC_SRC_SUPPORT_CPP_TYPE_TRAITS_IS_OBJECT_H |
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why is this all caps?
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This is a concept defined by the standard "23.14.3 [func.require]".
INVOKE(all caps) serves as a foundation for definingstd::invokeandstd::invoke_result.