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 // <streambuf>
10 
11 // template <class charT, class traits = char_traits<charT> >
12 // class basic_streambuf;
13 
14 // int_type underflow();
15 
16 #include <streambuf>
17 #include <cassert>
18 
19 struct test
20     : public std::basic_streambuf<char>
21 {
22     test() {}
23 };
24 
25 int main(int, char**)
26 {
27     test t;
28     assert(t.sgetc() == -1);
29 
30   return 0;
31 }
32