57 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// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_STRSTREAM10 11// <strstream>12 13// class strstreambuf14 15// int_type underflow();16 17#include <strstream>18#include <cassert>19 20#include "test_macros.h"21 22struct test23 : public std::strstreambuf24{25 typedef std::strstreambuf base;26 test(char* gnext_arg, std::streamsize n, char* pbeg_arg = 0)27 : base(gnext_arg, n, pbeg_arg) {}28 test(const char* gnext_arg, std::streamsize n)29 : base(gnext_arg, n) {}30 31 base::int_type underflow() {return base::underflow();}32};33 34int main(int, char**)35{36 {37 char buf[10] = "123";38 test sb(buf, 0, buf + 3);39 assert(sb.underflow() == '1');40 assert(sb.underflow() == '1');41 assert(sb.snextc() == '2');42 assert(sb.underflow() == '2');43 assert(sb.underflow() == '2');44 assert(sb.snextc() == '3');45 assert(sb.underflow() == '3');46 assert(sb.underflow() == '3');47 assert(sb.snextc() == EOF);48 assert(sb.underflow() == EOF);49 assert(sb.underflow() == EOF);50 sb.sputc('4');51 assert(sb.underflow() == '4');52 assert(sb.underflow() == '4');53 }54 55 return 0;56}57