65 lines
1.4 KiB
C++
65 lines
1.4 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <string_view>
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// constexpr const _CharT& at(size_type _pos) const;
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#include <string_view>
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#include <stdexcept>
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#include <cassert>
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#include "test_macros.h"
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template <typename CharT>
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void test(const CharT* s, std::size_t len) {
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std::basic_string_view<CharT> sv(s, len);
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assert(sv.length() == len);
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for (std::size_t i = 0; i < len; ++i) {
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assert(sv.at(i) == s[i]);
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assert(&sv.at(i) == s + i);
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}
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#ifndef TEST_HAS_NO_EXCEPTIONS
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try {
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(void)sv.at(len);
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} catch (const std::out_of_range&) {
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return;
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}
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assert(false);
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#endif
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}
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int main(int, char**) {
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test("ABCDE", 5);
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test("a", 1);
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#ifndef TEST_HAS_NO_WIDE_CHARACTERS
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test(L"ABCDE", 5);
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test(L"a", 1);
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#endif
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#if TEST_STD_VER >= 11
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test(u"ABCDE", 5);
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test(u"a", 1);
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test(U"ABCDE", 5);
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test(U"a", 1);
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#endif
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#if TEST_STD_VER >= 11
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{
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constexpr std::basic_string_view<char> sv("ABC", 2);
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static_assert(sv.length() == 2, "");
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static_assert(sv.at(0) == 'A', "");
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static_assert(sv.at(1) == 'B', "");
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}
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#endif
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return 0;
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}
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