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39 lines
1.2 KiB
C++
39 lines
1.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03, c++11
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// <functional>
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// Hashing a struct w/o a defined hash should *not* fail, but it should
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// create a type that is not constructible and not callable.
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// See also: https://cplusplus.github.io/LWG/lwg-defects.html#2543
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#include <functional>
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#include <cassert>
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#include <type_traits>
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#include "test_macros.h"
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struct X {};
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int main()
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{
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using H = std::hash<X>;
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static_assert(!std::is_default_constructible<H>::value, "");
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static_assert(!std::is_copy_constructible<H>::value, "");
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static_assert(!std::is_move_constructible<H>::value, "");
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static_assert(!std::is_copy_assignable<H>::value, "");
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static_assert(!std::is_move_assignable<H>::value, "");
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#if TEST_STD_VER > 14
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static_assert(!std::is_invocable<H, X&>::value, "");
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static_assert(!std::is_invocable<H, X const&>::value, "");
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#endif
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}
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