1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
10 
11 // checks that CTAD for std::function works properly with static operator() overloads
12 
13 #include <functional>
14 #include <type_traits>
15 
16 struct Except0 {
operator ()Except017   static void operator()() {}
18 };
19 static_assert(std::is_same_v<decltype(std::function{Except0{}}), std::function<void()>>);
20 
21 struct Except1 {
operator ()Except122   static int operator()(int&) { return 0; }
23 };
24 static_assert(std::is_same_v<decltype(std::function{Except1{}}), std::function<int(int&)>>);
25 
26 struct Except2 {
operator ()Except227   static int operator()(int*, long*) { return 0; }
28 };
29 static_assert(std::is_same_v<decltype(std::function{Except2{}}), std::function<int(int*, long*)>>);
30 
31 struct ExceptD {
operator ()ExceptD32   static int operator()(int*, long* = nullptr) { return 0; }
33 };
34 static_assert(std::is_same_v<decltype(std::function{ExceptD{}}), std::function<int(int*, long*)>>);
35 
36 struct Noexcept {
operator ()Noexcept37   static int operator()(int*, long*) noexcept { return 0; }
38 };
39 
40 static_assert(std::is_same_v<decltype(std::function{Noexcept{}}), std::function<int(int*, long*)>>);
41