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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
//
//===----------------------------------------------------------------------===//
// <string_view>
// constexpr const _CharT& at(size_type _pos) const;
#include <string_view>
#include <stdexcept>
#include <cassert>
#include "test_macros.h"
template <typename CharT>
void test(const CharT* s, std::size_t len) {
std::basic_string_view<CharT> sv(s, len);
assert(sv.length() == len);
for (std::size_t i = 0; i < len; ++i) {
assert(sv.at(i) == s[i]);
assert(&sv.at(i) == s + i);
}
#ifndef TEST_HAS_NO_EXCEPTIONS
try {
(void)sv.at(len);
} catch (const std::out_of_range&) {
return;
}
assert(false);
#endif
}
int main(int, char**) {
test("ABCDE", 5);
test("a", 1);
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
test(L"ABCDE", 5);
test(L"a", 1);
#endif
#if TEST_STD_VER >= 11
test(u"ABCDE", 5);
test(u"a", 1);
test(U"ABCDE", 5);
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.at(0) == 'A', "");
static_assert(sv.at(1) == 'B', "");
}
#endif
return 0;
}
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