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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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: !stdlib=libc++ && (c++03 || c++11 || c++14)
// <string_view>
// constexpr const _CharT& front();
#include <string_view>
#include <cassert>
#include "test_macros.h"
template <typename CharT>
bool test(const CharT* s, std::size_t len) {
typedef std::basic_string_view<CharT> SV;
SV sv(s, len);
ASSERT_SAME_TYPE(decltype(sv.back()), typename SV::const_reference);
LIBCPP_ASSERT_NOEXCEPT(sv.back());
assert(sv.length() == len);
assert(sv.back() == s[len - 1]);
return &sv.back() == s + len - 1;
}
int main(int, char**) {
assert(test("ABCDE", 5));
assert(test("a", 1));
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
assert(test(L"ABCDE", 5));
assert(test(L"a", 1));
#endif
#if TEST_STD_VER >= 11
assert(test(u"ABCDE", 5));
assert(test(u"a", 1));
assert(test(U"ABCDE", 5));
assert(test(U"a", 1));
#endif
#if TEST_STD_VER >= 11
{
constexpr std::basic_string_view<char> sv("ABC", 2);
static_assert(sv.length() == 2, "");
static_assert(sv.back() == 'B', "");
}
#endif
return 0;
}
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