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