| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20 |
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| 10 | |
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| 11 | // <functional> |
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| 12 | |
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| 13 | // template<class R, class F, class... Args> |
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| 14 | // constexpr R invoke_r(F&& f, Args&&... args) // C++23 |
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| 15 | // noexcept(is_nothrow_invocable_r_v<R, F, Args...>); |
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| 16 | // |
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| 17 | // Make sure that we diagnose when std::invoke_r is used with a return type that |
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| 18 | // would yield a dangling reference to a temporary. |
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| 19 | |
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| 20 | // TODO: We currently can't diagnose because we don't implement reference_converts_from_temporary. |
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| 21 | // XFAIL: * |
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| 22 | |
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| 23 | #include <functional> |
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| 24 | #include <cassert> |
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| 25 | |
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| 26 | #include "test_macros.h" |
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| 27 | |
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| 28 | void f() { |
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| 29 | auto func = []() -> int { return 0; }; |
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| 30 | std::invoke_r<int&&>(func); // expected-error {{Returning from invoke_r would bind a temporary object}} |
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| 31 | } |
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| 32 | |
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