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 // <sstream>
10 
11 // template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
12 // class basic_istringstream
13 
14 // void swap(basic_istringstream& rhs);
15 
16 #include <sstream>
17 #include <cassert>
18 
19 #include "test_macros.h"
20 
main(int,char **)21 int main(int, char**)
22 {
23     {
24         std::istringstream ss0(" 123 456");
25         std::istringstream ss(" 789 321");
26         ss.swap(ss0);
27         assert(ss.rdbuf() != 0);
28         assert(ss.good());
29         assert(ss.str() == " 123 456");
30         int i = 0;
31         ss >> i;
32         assert(i == 123);
33         ss >> i;
34         assert(i == 456);
35         ss0 >> i;
36         assert(i == 789);
37         ss0 >> i;
38         assert(i == 321);
39     }
40 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
41     {
42         std::wistringstream ss0(L" 123 456");
43         std::wistringstream ss(L" 789 321");
44         ss.swap(ss0);
45         assert(ss.rdbuf() != 0);
46         assert(ss.good());
47         assert(ss.str() == L" 123 456");
48         int i = 0;
49         ss >> i;
50         assert(i == 123);
51         ss >> i;
52         assert(i == 456);
53         ss0 >> i;
54         assert(i == 789);
55         ss0 >> i;
56         assert(i == 321);
57     }
58 #endif
59 
60   return 0;
61 }
62