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 // streamsize sputn(const char_type* s, streamsize n);
15 
16 #include <streambuf>
17 #include <cassert>
18 
19 int xsputn_called = 0;
20 
21 struct test
22     : public std::basic_streambuf<char>
23 {
24     test() {}
25 
26 protected:
27     std::streamsize xsputn(const char_type*, std::streamsize)
28     {
29         ++xsputn_called;
30         return 5;
31     }
32 };
33 
34 int main(int, char**)
35 {
36     test t;
37     assert(xsputn_called == 0);
38     assert(t.sputn(0, 0) == 5);
39     assert(xsputn_called == 1);
40 
41   return 0;
42 }
43