1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 // <strstream>
11 
12 // class istrstream
13 
14 // explicit istrstream(const char* s, streamsize n);
15 
16 #include <strstream>
17 #include <cassert>
18 
main()19 int main()
20 {
21     {
22         const char buf[] = "123 4.5 dog";
23         std::istrstream in(buf, 7);
24         int i;
25         in >> i;
26         assert(i == 123);
27         double d;
28         in >> d;
29         assert(d == 4.5);
30         std::string s;
31         in >> s;
32         assert(s == "");
33         assert(in.eof());
34         assert(in.fail());
35         in.clear();
36         in.putback('5');
37         assert(!in.fail());
38         in.putback('5');
39         assert(in.fail());
40         assert(buf[5] == '.');
41         assert(buf[6] == '5');
42     }
43 }
44