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 // void gbump(int n);
15 
16 #include <streambuf>
17 #include <cassert>
18 
19 template <class CharT>
20 struct test
21     : public std::basic_streambuf<CharT>
22 {
23     typedef std::basic_streambuf<CharT> base;
24 
25     test() {}
26 
27     void setg(CharT* gbeg, CharT* gnext, CharT* gend)
28     {
29         base::setg(gbeg, gnext, gend);
30     }
31 
32     void gbump(int n)
33     {
34         CharT* gbeg = base::eback();
35         CharT* gnext = base::gptr();
36         CharT* gend = base::egptr();
37         base::gbump(n);
38         assert(base::eback() == gbeg);
39         assert(base::gptr() == gnext+n);
40         assert(base::egptr() == gend);
41     }
42 };
43 
44 int main(int, char**)
45 {
46     {
47         test<char> t;
48         char in[] = "ABCDE";
49         t.setg(in, in+1, in+sizeof(in)/sizeof(in[0]));
50         t.gbump(2);
51     }
52     {
53         test<wchar_t> t;
54         wchar_t in[] = L"ABCDE";
55         t.setg(in, in+1, in+sizeof(in)/sizeof(in[0]));
56         t.gbump(3);
57     }
58 
59   return 0;
60 }
61