| 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 |
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| 10 | |
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| 11 | // <functional> |
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| 12 | |
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| 13 | // Hashing a struct w/o a defined hash should *not* fail, but it should |
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| 14 | // create a type that is not constructible and not callable. |
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| 15 | // See also: https://cplusplus.github.io/LWG/lwg-defects.html#2543 |
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| 16 | |
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| 17 | #include <functional> |
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| 18 | #include <cassert> |
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| 19 | #include <type_traits> |
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| 20 | |
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| 21 | #include "test_macros.h" |
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| 22 | |
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| 23 | struct X {}; |
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| 24 | |
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| 25 | int main(int, char**) |
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| 26 | { |
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| 27 | using H = std::hash<X>; |
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| 28 | static_assert(!std::is_default_constructible<H>::value, "" ); |
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| 29 | static_assert(!std::is_copy_constructible<H>::value, "" ); |
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| 30 | static_assert(!std::is_move_constructible<H>::value, "" ); |
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| 31 | static_assert(!std::is_copy_assignable<H>::value, "" ); |
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| 32 | static_assert(!std::is_move_assignable<H>::value, "" ); |
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| 33 | #if TEST_STD_VER > 14 |
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| 34 | static_assert(!std::is_invocable<H, X&>::value, "" ); |
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| 35 | static_assert(!std::is_invocable<H, X const&>::value, "" ); |
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| 36 | #endif |
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| 37 | |
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| 38 | return 0; |
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| 39 | } |
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| 40 | |
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