57 lines
1.3 KiB
C++
57 lines
1.3 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <functional>
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// template <class T>
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// struct hash
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// : public unary_function<T, size_t>
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// {
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// size_t operator()(T val) const;
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// };
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// Not very portable
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#include <string>
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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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template <class T>
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void
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test()
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{
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typedef std::hash<T> H;
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static_assert((std::is_same<typename H::argument_type, T>::value), "" );
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static_assert((std::is_same<typename H::result_type, std::size_t>::value), "" );
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ASSERT_NOEXCEPT(H()(T()));
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H h;
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std::string g1 = "1234567890";
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std::string g2 = "1234567891";
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T s1(g1.begin(), g1.end());
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T s2(g2.begin(), g2.end());
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assert(h(s1) != h(s2));
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}
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int main(int, char**)
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{
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test<std::string>();
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#if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
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test<std::u8string>();
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#endif
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#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
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test<std::u16string>();
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test<std::u32string>();
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#endif // _LIBCPP_HAS_NO_UNICODE_CHARS
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test<std::wstring>();
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return 0;
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}
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