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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_view>
#include <string>
#include <cassert>
#include <type_traits>
#include "test_macros.h"
using std::string_view;
template <class SV>
void
test()
{
typedef std::hash<SV> H;
static_assert((std::is_same<typename H::argument_type, SV>::value), "" );
static_assert((std::is_same<typename H::result_type, std::size_t>::value), "" );
typedef typename SV::value_type char_type;
typedef std::basic_string<char_type> String;
typedef std::hash<String> SH;
ASSERT_NOEXCEPT(H()(SV()));
char_type g1 [ 10 ];
char_type g2 [ 10 ];
for ( int i = 0; i < 10; ++i )
g1[i] = g2[9-i] = static_cast<char_type>('0' + i);
H h;
SH sh;
SV s1(g1, 10);
String ss1(s1);
SV s2(g2, 10);
String ss2(s2);
assert(h(s1) == h(s1));
assert(h(s1) != h(s2));
assert(sh(ss1) == h(s1));
assert(sh(ss2) == h(s2));
}
int main(int, char**)
{
test<std::string_view>();
#if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
test<std::u8string_view>();
#endif
#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
test<std::u16string_view>();
test<std::u32string_view>();
#endif
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
test<std::wstring_view>();
#endif
return 0;
}
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