| //===----------------------------------------------------------------------===// |
| // |
| // 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; |
| } |