83 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: !stdlib=libc++ && (c++03 || c++11 || c++14)10 11// <string_view>12 13// void remove_suffix(size_type _n)14 15#include <cassert>16#include <cstddef>17#include <string_view>18 19#include "test_macros.h"20 21template <typename CharT>22void test(const CharT* s, std::size_t len) {23 typedef std::basic_string_view<CharT> SV;24 {25 SV sv1(s);26 assert(sv1.size() == len);27 assert(sv1.data() == s);28 29 if (len > 0) {30 sv1.remove_suffix(1);31 assert(sv1.size() == (len - 1));32 assert(sv1.data() == s);33 sv1.remove_suffix(len - 1);34 }35 36 assert(sv1.size() == 0);37 sv1.remove_suffix(0);38 assert(sv1.size() == 0);39 }40}41 42#if TEST_STD_VER > 1143constexpr std::size_t test_ce(size_t n, size_t k) {44 typedef std::basic_string_view<char> SV;45 SV sv1{"ABCDEFGHIJKL", n};46 sv1.remove_suffix(k);47 return sv1.size();48}49#endif50 51int main(int, char**) {52 test("ABCDE", 5);53 test("a", 1);54 test("", 0);55 56#ifndef TEST_HAS_NO_WIDE_CHARACTERS57 test(L"ABCDE", 5);58 test(L"a", 1);59 test(L"", 0);60#endif61 62#if TEST_STD_VER >= 1163 test(u"ABCDE", 5);64 test(u"a", 1);65 test(u"", 0);66 67 test(U"ABCDE", 5);68 test(U"a", 1);69 test(U"", 0);70#endif71 72#if TEST_STD_VER > 1173 {74 static_assert(test_ce(5, 0) == 5, "");75 static_assert(test_ce(5, 1) == 4, "");76 static_assert(test_ce(5, 5) == 0, "");77 static_assert(test_ce(9, 3) == 6, "");78 }79#endif80 81 return 0;82}83