| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <functional> |
| |
| // class function<R(ArgTypes...)> |
| |
| // template<class F> function(F); |
| |
| // Allow incomplete argument types in the __is_callable check |
| |
| #include <functional> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| |
| struct X{ |
| typedef std::function<void(X&)> callback_type; |
| virtual ~X() {} |
| private: |
| callback_type _cb; |
| }; |
| |
| struct IncompleteReturnType { |
| std::function<IncompleteReturnType ()> fn; |
| }; |
| |
| |
| int called = 0; |
| IncompleteReturnType test_fn() { |
| ++called; |
| IncompleteReturnType I; |
| return I; |
| } |
| |
| // See llvm.org/PR34298 |
| void test_pr34298() |
| { |
| static_assert(std::is_copy_constructible<IncompleteReturnType>::value, ""); |
| static_assert(std::is_copy_assignable<IncompleteReturnType>::value, ""); |
| { |
| IncompleteReturnType X; |
| X.fn = test_fn; |
| const IncompleteReturnType& CX = X; |
| IncompleteReturnType X2 = CX; |
| assert(X2.fn); |
| assert(called == 0); |
| X2.fn(); |
| assert(called == 1); |
| } |
| { |
| IncompleteReturnType Empty; |
| IncompleteReturnType X2 = Empty; |
| assert(!X2.fn); |
| } |
| } |
| |
| int main(int, char**) { |
| test_pr34298(); |
| |
| return 0; |
| } |