exchange.pass.cpp revision e2735d1df071b4854e577c227fe9d72b5de2b94e 
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// utilities
11
12// exchange
13
14#include <utility>
15#include <cassert>
16#include <string>
17
18int main()
19{
20#if _LIBCPP_STD_VER > 11
21	{
22	int v = 12;
23	assert ( std::exchange ( v, 23 ) == 12 );
24	assert ( v == 23 );
25	assert ( std::exchange ( v, 67.2 ) == 23 );
26	assert ( v = 67 );
27	}
28
29	{
30	bool b = false;
31	assert ( !std::exchange ( b, true ));
32	assert ( b );
33	}
34
35	{
36	const std::string s1 ( "Hi Mom!" );
37	const std::string s2 ( "Yo Dad!" );
38	std::string s3 = s1; // Mom
39	assert ( std::exchange ( s3, s2 ) == s1 );
40	assert ( s3 == s2 );
41	assert ( std::exchange ( s3, "Hi Mom!" ) == s2 );
42	assert ( s3 == s1 );
43	assert ( std::exchange ( s3, "" ) == s1 );
44	assert ( s3.size () == 0 );
45	}
46#endif
47}
48