| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <sstream> |
| |
| // template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> > |
| // class basic_stringbuf |
| |
| // int_type pbackfail(int_type c = traits::eof()); |
| |
| #include <sstream> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| |
| template <class CharT> |
| struct testbuf |
| : public std::basic_stringbuf<CharT> |
| { |
| typedef std::basic_stringbuf<CharT> base; |
| explicit testbuf(const std::basic_string<CharT>& str, |
| std::ios_base::openmode which = std::ios_base::in | std::ios_base::out) |
| : base(str, which) {} |
| |
| typename base::int_type |
| pbackfail(typename base::int_type c = base::traits_type::eof()) |
| {return base::pbackfail(c);} |
| |
| void pbump(int n) {base::pbump(n);} |
| }; |
| |
| int main(int, char**) |
| { |
| // check pbackfail |
| { |
| testbuf<char> tb(""); |
| tb.pbackfail(); |
| } |
| { |
| testbuf<char> sb("123", std::ios_base::in); |
| assert(sb.sgetc() == '1'); |
| assert(sb.snextc() == '2'); |
| assert(sb.snextc() == '3'); |
| assert(sb.sgetc() == '3'); |
| assert(sb.snextc() == std::char_traits<char>::eof()); |
| assert(sb.pbackfail('3') == '3'); |
| assert(sb.pbackfail('3') == std::char_traits<char>::eof()); |
| assert(sb.pbackfail('2') == '2'); |
| assert(sb.pbackfail(std::char_traits<char>::eof()) != std::char_traits<char>::eof()); |
| assert(sb.pbackfail(std::char_traits<char>::eof()) == std::char_traits<char>::eof()); |
| assert(sb.str() == "123"); |
| } |
| { |
| testbuf<char> sb("123"); |
| assert(sb.sgetc() == '1'); |
| assert(sb.snextc() == '2'); |
| assert(sb.snextc() == '3'); |
| assert(sb.sgetc() == '3'); |
| assert(sb.snextc() == std::char_traits<char>::eof()); |
| assert(sb.pbackfail('3') == '3'); |
| assert(sb.pbackfail('3') == '3'); |
| assert(sb.pbackfail(std::char_traits<char>::eof()) != std::char_traits<char>::eof()); |
| assert(sb.pbackfail(std::char_traits<char>::eof()) == std::char_traits<char>::eof()); |
| assert(sb.str() == "133"); |
| } |
| #ifndef TEST_HAS_NO_WIDE_CHARACTERS |
| { |
| testbuf<wchar_t> sb(L"123", std::ios_base::in); |
| assert(sb.sgetc() == L'1'); |
| assert(sb.snextc() == L'2'); |
| assert(sb.snextc() == L'3'); |
| assert(sb.sgetc() == L'3'); |
| assert(sb.snextc() == std::char_traits<wchar_t>::eof()); |
| assert(sb.pbackfail(L'3') == L'3'); |
| assert(sb.pbackfail(L'3') == std::char_traits<wchar_t>::eof()); |
| assert(sb.pbackfail(L'2') == L'2'); |
| assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) != std::char_traits<wchar_t>::eof()); |
| assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) == std::char_traits<wchar_t>::eof()); |
| assert(sb.str() == L"123"); |
| } |
| { |
| testbuf<wchar_t> sb(L"123"); |
| assert(sb.sgetc() == L'1'); |
| assert(sb.snextc() == L'2'); |
| assert(sb.snextc() == L'3'); |
| assert(sb.sgetc() == L'3'); |
| assert(sb.snextc() == std::char_traits<wchar_t>::eof()); |
| assert(sb.pbackfail(L'3') == L'3'); |
| assert(sb.pbackfail(L'3') == L'3'); |
| assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) != std::char_traits<wchar_t>::eof()); |
| assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) == std::char_traits<wchar_t>::eof()); |
| assert(sb.str() == L"133"); |
| } |
| #endif |
| |
| return 0; |
| } |