55 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_istringstream15 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_istringstream<CharT> ss(STR(" 123 456"));34 static_assert(noexcept(ss.view()));35 assert(ss.view() == SV(" 123 456"));36 ss.str(STR(" 789"));37 ss.clear();38 assert(ss.view() == SV(" 789"));39 40 const std::basic_istringstream<CharT> css(STR("abc"));41 static_assert(noexcept(css.view()));42 assert(css.view() == SV("abc"));43 44 std::basic_istringstream<CharT, my_char_traits<CharT>> tss;45 static_assert(std::is_same_v<decltype(tss.view()), std::basic_string_view<CharT, my_char_traits<CharT>>>);46}47 48int main(int, char**) {49 test<char>();50#ifndef TEST_HAS_NO_WIDE_CHARACTERS51 test<wchar_t>();52#endif53 return 0;54}55