| 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 | |
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| 10 | // <unordered_map> |
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| 11 | |
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| 12 | // Check that std::unordered_set fails to instantiate if the hash function is |
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| 13 | // not copy-constructible. This is mentioned in LWG issue 2436 |
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| 14 | |
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| 15 | #include <unordered_set> |
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| 16 | |
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| 17 | template <class T> |
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| 18 | struct Hash { |
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| 19 | std::size_t operator () (const T& lhs) const { return 0; } |
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| 20 | |
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| 21 | Hash () {} |
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| 22 | private: |
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| 23 | Hash (const Hash &); // declared but not defined |
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| 24 | }; |
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| 25 | |
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| 26 | |
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| 27 | int main(int, char**) { |
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| 28 | std::unordered_set<int, Hash<int> > m; |
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| 29 | |
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| 30 | return 0; |
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| 31 | } |
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| 32 | |
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