89 lines
1.8 KiB
C++
89 lines
1.8 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>
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// const_reference at(size_type pos) const; // constexpr since C++20
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// reference at(size_type pos); // constexpr since C++20
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#include <string>
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#include <stdexcept>
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#include <cassert>
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#include "min_allocator.h"
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#include "test_macros.h"
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template <class S>
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TEST_CONSTEXPR_CXX20 void
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test(S s, typename S::size_type pos)
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{
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const S& cs = s;
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if (pos < s.size())
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{
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assert(s.at(pos) == s[pos]);
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assert(cs.at(pos) == cs[pos]);
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}
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#ifndef TEST_HAS_NO_EXCEPTIONS
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else if (!TEST_IS_CONSTANT_EVALUATED)
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{
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try
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{
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TEST_IGNORE_NODISCARD s.at(pos);
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assert(false);
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}
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catch (std::out_of_range&)
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{
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assert(pos >= s.size());
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}
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try
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{
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TEST_IGNORE_NODISCARD cs.at(pos);
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assert(false);
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}
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catch (std::out_of_range&)
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{
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assert(pos >= s.size());
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}
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}
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#endif
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}
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TEST_CONSTEXPR_CXX20 bool test() {
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{
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typedef std::string S;
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test(S(), 0);
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test(S("123"), 0);
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test(S("123"), 1);
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test(S("123"), 2);
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test(S("123"), 3);
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}
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#if TEST_STD_VER >= 11
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{
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typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
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test(S(), 0);
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test(S("123"), 0);
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test(S("123"), 1);
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test(S("123"), 2);
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test(S("123"), 3);
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}
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#endif
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return true;
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}
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int main(int, char**)
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{
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test();
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#if TEST_STD_VER > 17
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static_assert(test());
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#endif
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return 0;
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}
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