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 // <functional>
12
13 // template<class R, class F, class... Args>
14 // constexpr R invoke_r(F&& f, Args&&... args) // C++23
15 // noexcept(is_nothrow_invocable_r_v<R, F, Args...>);
16 //
17 // Make sure that we diagnose when std::invoke_r is used with a return type that
18 // would yield a dangling reference to a temporary.
19
20 // TODO: We currently can't diagnose because we don't implement reference_converts_from_temporary.
21 // XFAIL: *
22
23 #include <functional>
24 #include <cassert>
25
26 #include "test_macros.h"
27
f()28 void f() {
29 auto func = []() -> int { return 0; };
30 std::invoke_r<int&&>(func); // expected-error {{Returning from invoke_r would bind a temporary object}}
31 }
32