69 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: c++03, c++11, c++14, c++1710 11// <sstream>12 13// template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >14// class basic_stringstream15 16// basic_string_view<charT, traits> view() const noexcept;17 18#include <sstream>19#include <cassert>20#include <type_traits>21 22#include "make_string.h"23#include "test_macros.h"24 25#define STR(S) MAKE_STRING(CharT, S)26#define SV(S) MAKE_STRING_VIEW(CharT, S)27 28template <class CharT>29struct my_char_traits : public std::char_traits<CharT> {};30 31template <class CharT>32static void test() {33 std::basic_stringstream<CharT> ss(STR(" 123 456 "));34 static_assert(noexcept(ss.view()));35 assert(ss.view() == SV(" 123 456 "));36 int i = 0;37 ss >> i;38 assert(i == 123);39 ss >> i;40 assert(i == 456);41 ss << i << ' ' << 123;42 assert(ss.view() == SV("456 1236 "));43 ss.str(STR("5466 89 "));44 ss >> i;45 assert(i == 5466);46 ss >> i;47 assert(i == 89);48 ss << i << ' ' << 321;49 assert(ss.view() == SV("89 3219 "));50 51 const std::basic_stringstream<CharT> css(STR("abc"));52 static_assert(noexcept(css.view()));53 assert(css.view() == SV("abc"));54 55 std::basic_stringstream<CharT, my_char_traits<CharT>> tss;56 static_assert(std::is_same_v<decltype(tss.view()), std::basic_string_view<CharT, my_char_traits<CharT>>>);57}58 59int main(int, char**) {60 test<char>();61#ifndef TEST_HAS_NO_WIDE_CHARACTERS62 test<wchar_t>();63#endif64 std::stringstream ss;65 ss.write("\xd1", 1);66 assert(ss.view().length() == 1);67 return 0;68}69