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 // <valarray>
11 
12 // template<class T> class valarray;
13 
14 // void swap(valarray& v);
15 
16 #include <valarray>
17 #include <cassert>
18 #include <cstddef>
19 
20 int main()
21 {
22     {
23         typedef int T;
24         T a1[] = {1, 2, 3, 4, 5};
25         T a2[] = {6, 7, 8, 9, 10, 11, 12};
26         const unsigned N1 = sizeof(a1)/sizeof(a1[0]);
27         const unsigned N2 = sizeof(a2)/sizeof(a2[0]);
28         std::valarray<T> v1(a1, N1);
29         std::valarray<T> v2(a2, N2);
30         std::valarray<T> v1_save = v1;
31         std::valarray<T> v2_save = v2;
32         v1.swap(v2);
33         assert(v1.size() == v2_save.size());
34         for (std::size_t i = 0; i < v1.size(); ++i)
35             assert(v1[i] == v2_save[i]);
36         assert(v2.size() == v1_save.size());
37         for (std::size_t i = 0; i < v2.size(); ++i)
38             assert(v2[i] == v1_save[i]);
39     }
40     {
41         typedef int T;
42         T a1[] = {1, 2, 3, 4, 5};
43         const unsigned N1 = sizeof(a1)/sizeof(a1[0]);
44         const unsigned N2 = 0;
45         std::valarray<T> v1(a1, N1);
46         std::valarray<T> v2;
47         std::valarray<T> v1_save = v1;
48         std::valarray<T> v2_save = v2;
49         v1.swap(v2);
50         assert(v1.size() == v2_save.size());
51         for (std::size_t i = 0; i < v1.size(); ++i)
52             assert(v1[i] == v2_save[i]);
53         assert(v2.size() == v1_save.size());
54         for (std::size_t i = 0; i < v2.size(); ++i)
55             assert(v2[i] == v1_save[i]);
56     }
57     {
58         typedef int T;
59         T a2[] = {6, 7, 8, 9, 10, 11, 12};
60         const unsigned N1 = 0;
61         const unsigned N2 = sizeof(a2)/sizeof(a2[0]);
62         std::valarray<T> v1;
63         std::valarray<T> v2(a2, N2);
64         std::valarray<T> v1_save = v1;
65         std::valarray<T> v2_save = v2;
66         v1.swap(v2);
67         assert(v1.size() == v2_save.size());
68         for (std::size_t i = 0; i < v1.size(); ++i)
69             assert(v1[i] == v2_save[i]);
70         assert(v2.size() == v1_save.size());
71         for (std::size_t i = 0; i < v2.size(); ++i)
72             assert(v2[i] == v1_save[i]);
73     }
74     {
75         typedef int T;
76         const unsigned N1 = 0;
77         const unsigned N2 = 0;
78         std::valarray<T> v1;
79         std::valarray<T> v2;
80         std::valarray<T> v1_save = v1;
81         std::valarray<T> v2_save = v2;
82         v1.swap(v2);
83         assert(v1.size() == v2_save.size());
84         for (std::size_t i = 0; i < v1.size(); ++i)
85             assert(v1[i] == v2_save[i]);
86         assert(v2.size() == v1_save.size());
87         for (std::size_t i = 0; i < v2.size(); ++i)
88             assert(v2[i] == v1_save[i]);
89     }
90 }
91