feat(core): import a std::apply polyfill

GitOrigin-RevId: da95c85b57f8db863e4eb6456f32aec6e5737759

ACKNOWLEDGMENTS

@@ -28,6 +28,9 @@ Copyright (c) 2018 Facebook
 7. libnpy
 Copyright (c) 2017 Leon Merten Lohse
 
+8. invoke.hpp
+Copyright (c) 2018-2020 Matvey Cherevko (blackmatov@gmail.com)
+
 Terms of the MIT License:
 --------------------------------------------------------------------
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

src/opr/impl/internal/invoke.h

+/*
+ * This file is part of the "https://github.com/blackmatov/invoke.hpp"
+ * MIT License
+ *
+ * Copyright (C) 2018-2020, by Matvey Cherevko (blackmatov@gmail.com)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#pragma once
+
+#include <tuple>
+#include <utility>
+#include <functional>
+#include <type_traits>
+
+#define INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(...) \
+    noexcept(noexcept(__VA_ARGS__)) -> decltype (__VA_ARGS__) { return __VA_ARGS__; }
+
+//
+// void_t
+//
+
+namespace mgb {
+namespace impl {
+template <typename... Args>
+struct make_void {
+    using type = void;
+};
+}  // namespace impl
+
+template <typename... Args>
+using void_t = typename impl::make_void<Args...>::type;
+}  // namespace mgb
+
+//
+// is_reference_wrapper
+//
+
+namespace mgb {
+namespace impl {
+template <typename T>
+struct is_reference_wrapper_impl : std::false_type {};
+
+template <typename U>
+struct is_reference_wrapper_impl<std::reference_wrapper<U>> : std::true_type {};
+}  // namespace impl
+
+template <typename T>
+struct is_reference_wrapper
+        : impl::is_reference_wrapper_impl<typename std::remove_cv<T>::type> {};
+}  // namespace mgb
+
+//
+// invoke
+//
+
+namespace mgb
+{
+    namespace impl
+    {
+        //
+        // invoke_member_object_impl
+        //
+
+        template
+        <
+            typename Base, typename F, typename Derived,
+            typename std::enable_if<std::is_base_of<Base, typename std::decay<Derived>::type>::value, int>::type = 0
+        >
+        constexpr auto invoke_member_object_impl(F Base::* f, Derived&& ref)
+        INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
+            std::forward<Derived>(ref).*f)
+
+        template
+        <
+            typename Base, typename F, typename RefWrap,
+            typename std::enable_if<is_reference_wrapper<typename std::decay<RefWrap>::type>::value, int>::type = 0
+        >
+        constexpr auto invoke_member_object_impl(F Base::* f, RefWrap&& ref)
+        INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
+            ref.get().*f)
+
+        template
+        <
+            typename Base, typename F, typename Pointer,
+            typename std::enable_if<
+                !std::is_base_of<Base, typename std::decay<Pointer>::type>::value &&
+                !is_reference_wrapper<typename std::decay<Pointer>::type>::value
+            , int>::type = 0
+        >
+        constexpr auto invoke_member_object_impl(F Base::* f, Pointer&& ptr)
+        INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
+            (*std::forward<Pointer>(ptr)).*f)
+
+        //
+        // invoke_member_function_impl
+        //
+
+        template
+        <
+            typename Base, typename F, typename Derived, typename... Args,
+            typename std::enable_if<std::is_base_of<Base, typename std::decay<Derived>::type>::value, int>::type = 0
+        >
+        constexpr auto invoke_member_function_impl(F Base::* f, Derived&& ref, Args&&... args)
+        INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
+            (std::forward<Derived>(ref).*f)(std::forward<Args>(args)...))
+
+        template
+        <
+            typename Base, typename F, typename RefWrap, typename... Args,
+            typename std::enable_if<is_reference_wrapper<typename std::decay<RefWrap>::type>::value, int>::type = 0
+        >
+        constexpr auto invoke_member_function_impl(F Base::* f, RefWrap&& ref, Args&&... args)
+        INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
+            (ref.get().*f)(std::forward<Args>(args)...))
+
+        template
+        <
+            typename Base, typename F, typename Pointer, typename... Args,
+            typename std::enable_if<
+                !std::is_base_of<Base, typename std::decay<Pointer>::type>::value &&
+                !is_reference_wrapper<typename std::decay<Pointer>::type>::value
+            , int>::type = 0
+        >
+        constexpr auto invoke_member_function_impl(F Base::* f, Pointer&& ptr, Args&&... args)
+        INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
+            ((*std::forward<Pointer>(ptr)).*f)(std::forward<Args>(args)...))
+    }
+
+    template
+    <
+        typename F, typename... Args,
+        typename std::enable_if<!std::is_member_pointer<typename std::decay<F>::type>::value, int>::type = 0
+    >
+    constexpr auto invoke(F&& f, Args&&... args)
+    INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
+        std::forward<F>(f)(std::forward<Args>(args)...))
+
+    template
+    <
+        typename F, typename T,
+        typename std::enable_if<std::is_member_object_pointer<typename std::decay<F>::type>::value, int>::type = 0
+    >
+    constexpr auto invoke(F&& f, T&& t)
+    INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
+        impl::invoke_member_object_impl(std::forward<F>(f), std::forward<T>(t)))
+
+    template
+    <
+        typename F, typename... Args,
+        typename std::enable_if<std::is_member_function_pointer<typename std::decay<F>::type>::value, int>::type = 0
+    >
+    constexpr auto invoke(F&& f, Args&&... args)
+    INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
+        impl::invoke_member_function_impl(std::forward<F>(f), std::forward<Args>(args)...))
+}
+
+//
+// invoke_result
+//
+
+namespace mgb {
+namespace impl {
+struct invoke_result_impl_tag {};
+
+template <typename Void, typename F, typename... Args>
+struct invoke_result_impl {};
+
+template <typename F, typename... Args>
+struct invoke_result_impl<
+        void_t<invoke_result_impl_tag,
+               decltype(mgb::invoke(std::declval<F>(),
+                                    std::declval<Args>()...))>,
+        F, Args...> {
+    using type =
+            decltype(mgb::invoke(std::declval<F>(), std::declval<Args>()...));
+};
+}  // namespace impl
+
+template <typename F, typename... Args>
+struct invoke_result : impl::invoke_result_impl<void, F, Args...> {};
+
+template <typename F, typename... Args>
+using invoke_result_t = typename invoke_result<F, Args...>::type;
+}  // namespace mgb
+
+//
+// is_invocable
+//
+
+namespace mgb {
+namespace impl {
+struct is_invocable_r_impl_tag {};
+
+template <typename Void, typename R, typename F, typename... Args>
+struct is_invocable_r_impl : std::false_type {};
+
+template <typename R, typename F, typename... Args>
+struct is_invocable_r_impl<
+        void_t<is_invocable_r_impl_tag, invoke_result_t<F, Args...>>, R, F,
+        Args...>
+        : std::conditional<
+                  std::is_void<R>::value, std::true_type,
+                  std::is_convertible<invoke_result_t<F, Args...>, R>>::type {};
+}  // namespace impl
+
+template <typename R, typename F, typename... Args>
+struct is_invocable_r : impl::is_invocable_r_impl<void, R, F, Args...> {};
+
+template <typename F, typename... Args>
+using is_invocable = is_invocable_r<void, F, Args...>;
+}  // namespace mgb
+
+//
+// apply
+//
+
+namespace mgb {
+namespace impl {
+template <typename F, typename Tuple, std::size_t... I>
+constexpr auto apply_impl(F&& f, Tuple&& args, std::index_sequence<I...>)
+        INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(mgb::invoke(
+                std::forward<F>(f), std::get<I>(std::forward<Tuple>(args))...))
+}
+
+template <typename F, typename Tuple>
+constexpr auto apply(F&& f, Tuple&& args) INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
+        impl::apply_impl(std::forward<F>(f), std::forward<Tuple>(args),
+                         std::make_index_sequence<std::tuple_size<
+                                 typename std::decay<Tuple>::type>::value>()))
+}  // namespace mgb
+
+#undef INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN