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 sgetn(char_type* s, streamsize n);
15 
16 #include <streambuf>
17 #include <cassert>
18 
19 #include "test_macros.h"
20 
21 int xsgetn_called = 0;
22 
23 struct test
24     : public std::basic_streambuf<char>
25 {
testtest26     test() {}
27 
28 protected:
xsgetntest29     std::streamsize xsgetn(char_type*, std::streamsize)
30     {
31         ++xsgetn_called;
32         return 10;
33     }
34 };
35 
main(int,char **)36 int main(int, char**)
37 {
38     test t;
39     assert(xsgetn_called == 0);
40     assert(t.sgetn(0, 0) == 10);
41     assert(xsgetn_called == 1);
42 
43   return 0;
44 }
45