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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <strstream>
// class strstreambuf
// int_type underflow();
#include <strstream>
#include <cassert>
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()
{
{
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');
}
}
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