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 // <valarray>
10 
11 // template <class T> class slice_array
12 
13 // const slice_array& operator=(const slice_array& sa) const;
14 
15 #include <valarray>
16 #include <cassert>
17 
18 int main()
19 {
20     {
21     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
22     int a2[] = {-1, -2, -3, -4, -5, -6, -7, -8, -9, -10, -11, -12};
23     std::valarray<int> v1(a1, sizeof(a1)/sizeof(a1[0]));
24     const std::valarray<int> v2(a2, sizeof(a2)/sizeof(a2[0]));
25     v1[std::slice(1, 5, 3)] = v2[std::slice(2, 5, 2)];
26     assert(v1.size() == 16);
27     assert(v1[ 0] ==  0);
28     assert(v1[ 1] == -3);
29     assert(v1[ 2] ==  2);
30     assert(v1[ 3] ==  3);
31     assert(v1[ 4] == -5);
32     assert(v1[ 5] ==  5);
33     assert(v1[ 6] ==  6);
34     assert(v1[ 7] == -7);
35     assert(v1[ 8] ==  8);
36     assert(v1[ 9] ==  9);
37     assert(v1[10] == -9);
38     assert(v1[11] == 11);
39     assert(v1[12] == 12);
40     assert(v1[13] == -11);
41     assert(v1[14] == 14);
42     assert(v1[15] == 15);
43     }
44     // Test return value of assignment.
45     {
46     int a1[] = {0, 1, 2};
47     std::valarray<int> v1(a1, 3);
48     std::slice_array<int> s1 = v1[std::slice(1, 1, 1)];
49     std::slice_array<int> s2 = v1[std::slice(0, 1, 1)];
50     std::slice_array<int> const & s3 = (s1 = s2);
51     assert(&s1 == &s3);
52     }
53 }
54