| 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 |
| 10 | |
| 11 | // <functional> |
| 12 | |
| 13 | // class function<R(ArgTypes...)> |
| 14 | |
| 15 | // template<class F> function(F); |
| 16 | |
| 17 | // Allow incomplete argument types in the __is_callable check |
| 18 | |
| 19 | #include <functional> |
| 20 | #include <cassert> |
| 21 | |
| 22 | #include "test_macros.h" |
| 23 | |
| 24 | struct X{ |
| 25 | typedef std::function<void(X&)> callback_type; |
| 26 | virtual ~X() {} |
| 27 | private: |
| 28 | callback_type _cb; |
| 29 | }; |
| 30 | |
| 31 | struct IncompleteReturnType { |
| 32 | std::function<IncompleteReturnType ()> fn; |
| 33 | }; |
| 34 | |
| 35 | |
| 36 | int called = 0; |
| 37 | IncompleteReturnType test_fn() { |
| 38 | ++called; |
| 39 | IncompleteReturnType I; |
| 40 | return I; |
| 41 | } |
| 42 | |
| 43 | // See llvm.org/PR34298 |
| 44 | void test_pr34298() |
| 45 | { |
| 46 | static_assert(std::is_copy_constructible<IncompleteReturnType>::value, ""); |
| 47 | static_assert(std::is_copy_assignable<IncompleteReturnType>::value, ""); |
| 48 | { |
| 49 | IncompleteReturnType X; |
| 50 | X.fn = test_fn; |
| 51 | const IncompleteReturnType& CX = X; |
| 52 | IncompleteReturnType X2 = CX; |
| 53 | assert(X2.fn); |
| 54 | assert(called == 0); |
| 55 | X2.fn(); |
| 56 | assert(called == 1); |
| 57 | } |
| 58 | { |
| 59 | IncompleteReturnType Empty; |
| 60 | IncompleteReturnType X2 = Empty; |
| 61 | assert(!X2.fn); |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | int main(int, char**) { |
| 66 | test_pr34298(); |
| 67 | |
| 68 | return 0; |
| 69 | } |
| 70 |