[libc-commits] [libc] [libc] Add invoke / invoke_result type traits (PR #65750)
Guillaume Chatelet via libc-commits
libc-commits at lists.llvm.org
Thu Sep 14 05:44:25 PDT 2023
================
@@ -0,0 +1,59 @@
+//===-- 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
+
+#include "src/__support/CPP/type_traits/decay.h"
+#include "src/__support/CPP/type_traits/enable_if.h"
+#include "src/__support/CPP/type_traits/is_base_of.h"
+#include "src/__support/CPP/type_traits/is_same.h"
+#include "src/__support/CPP/utility/forward.h"
+
+namespace __llvm_libc::cpp {
+
+namespace detail {
+
+// Catch all function and functor types.
+template <class FunctionPtrType> struct invoke_dispatcher {
+ template <class T, class... Args,
+ typename = cpp::enable_if_t<
+ cpp::is_same_v<cpp::decay_t<T>, FunctionPtrType>>>
+ static auto call(T &&fun, Args &&...args) {
+ return cpp::forward<T>(fun)(cpp::forward<Args>(args)...);
+ }
+};
+
+// Catch pointer to member function types.
+template <class Class, class FunctionReturnType>
+struct invoke_dispatcher<FunctionReturnType Class::*> {
+ using FunctionPtrType = FunctionReturnType Class::*;
+
+ template <class T, class... Args, class DecayT = cpp::decay_t<T>>
+ static auto call(FunctionPtrType fun, T &&t1, Args &&...args) {
+ if constexpr (cpp::is_base_of_v<Class, DecayT>) {
+ // T is a (possibly cv ref) type.
+ return (cpp::forward<T>(t1).*fun)(cpp::forward<Args>(args)...);
+ } else {
+ // T is assumed to be a pointer type.
----------------
gchatelet wrote:
Done
https://github.com/llvm/llvm-project/pull/65750
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