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//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
// <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;
}
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