| 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-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | // <sstream> |
| 10 | |
| 11 | // template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> > |
| 12 | // class basic_stringbuf |
| 13 | |
| 14 | // int_type underflow(); |
| 15 | |
| 16 | #include <sstream> |
| 17 | #include <cassert> |
| 18 | |
| 19 | #include "test_macros.h" |
| 20 | |
| 21 | template <class CharT> |
| 22 | struct testbuf |
| 23 | : public std::basic_stringbuf<CharT> |
| 24 | { |
| 25 | typedef std::basic_stringbuf<CharT> base; |
| 26 | explicit testbuf(const std::basic_string<CharT>& str) |
| 27 | : base(str) {} |
| 28 | |
| 29 | typename base::int_type underflow() {return base::underflow();} |
| 30 | void pbump(int n) {base::pbump(n);} |
| 31 | }; |
| 32 | |
| 33 | int main(int, char**) |
| 34 | { |
| 35 | { |
| 36 | testbuf<char> sb("123"); |
| 37 | sb.pbump(n: 3); |
| 38 | assert(sb.underflow() == '1'); |
| 39 | assert(sb.underflow() == '1'); |
| 40 | assert(sb.snextc() == '2'); |
| 41 | assert(sb.underflow() == '2'); |
| 42 | assert(sb.underflow() == '2'); |
| 43 | assert(sb.snextc() == '3'); |
| 44 | assert(sb.underflow() == '3'); |
| 45 | assert(sb.underflow() == '3'); |
| 46 | assert(sb.snextc() == std::char_traits<char>::eof()); |
| 47 | assert(sb.underflow() == std::char_traits<char>::eof()); |
| 48 | assert(sb.underflow() == std::char_traits<char>::eof()); |
| 49 | sb.sputc(c: '4'); |
| 50 | assert(sb.underflow() == '4'); |
| 51 | assert(sb.underflow() == '4'); |
| 52 | } |
| 53 | #ifndef TEST_HAS_NO_WIDE_CHARACTERS |
| 54 | { |
| 55 | testbuf<wchar_t> sb(L"123"); |
| 56 | sb.pbump(3); |
| 57 | assert(sb.underflow() == L'1'); |
| 58 | assert(sb.underflow() == L'1'); |
| 59 | assert(sb.snextc() == L'2'); |
| 60 | assert(sb.underflow() == L'2'); |
| 61 | assert(sb.underflow() == L'2'); |
| 62 | assert(sb.snextc() == L'3'); |
| 63 | assert(sb.underflow() == L'3'); |
| 64 | assert(sb.underflow() == L'3'); |
| 65 | assert(sb.snextc() == std::char_traits<wchar_t>::eof()); |
| 66 | assert(sb.underflow() == std::char_traits<wchar_t>::eof()); |
| 67 | assert(sb.underflow() == std::char_traits<wchar_t>::eof()); |
| 68 | sb.sputc(L'4'); |
| 69 | assert(sb.underflow() == L'4'); |
| 70 | assert(sb.underflow() == L'4'); |
| 71 | } |
| 72 | #endif // TEST_HAS_NO_WIDE_CHARACTERS |
| 73 | |
| 74 | return 0; |
| 75 | } |
| 76 |