| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <strstream> |
| |
| // class strstreambuf |
| |
| // int_type underflow(); |
| |
| #include <strstream> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| |
| struct test |
| : public std::strstreambuf |
| { |
| typedef std::strstreambuf base; |
| test(char* gnext_arg, std::streamsize n, char* pbeg_arg = 0) |
| : base(gnext_arg, n, pbeg_arg) {} |
| test(const char* gnext_arg, std::streamsize n) |
| : base(gnext_arg, n) {} |
| |
| base::int_type underflow() {return base::underflow();} |
| }; |
| |
| int main(int, char**) |
| { |
| { |
| char buf[10] = "123"; |
| test sb(buf, 0, buf + 3); |
| assert(sb.underflow() == '1'); |
| assert(sb.underflow() == '1'); |
| assert(sb.snextc() == '2'); |
| assert(sb.underflow() == '2'); |
| assert(sb.underflow() == '2'); |
| assert(sb.snextc() == '3'); |
| assert(sb.underflow() == '3'); |
| assert(sb.underflow() == '3'); |
| assert(sb.snextc() == EOF); |
| assert(sb.underflow() == EOF); |
| assert(sb.underflow() == EOF); |
| sb.sputc('4'); |
| assert(sb.underflow() == '4'); |
| assert(sb.underflow() == '4'); |
| } |
| |
| return 0; |
| } |