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 gslice_array
12 
13 // const gslice_array& operator=(const gslice_array& ga) const;
14 
15 #include <valarray>
16 #include <cassert>
17 
18 int main()
19 {
20     int a1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
21                 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
22                 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
23                 36, 37, 38, 39, 40};
24     int a2[] = { -0,  -1,  -2,  -3,  -4,  -5,  -6,  -7,  -8,  -9, -10, -11,
25                 -12, -13, -14, -15, -16, -17, -18, -19, -20, -21, -22, -23,
26                 -24, -25, -26, -27, -28, -29, -30, -31, -32, -33, -34, -35,
27                 -36, -37};
28     std::valarray<int> v1(a1, sizeof(a1)/sizeof(a1[0]));
29     const std::valarray<int> v2(a2, sizeof(a2)/sizeof(a2[0]));
30     std::size_t sz[] = {2, 4, 3};
31     std::size_t st[] = {19, 4, 1};
32     typedef std::valarray<std::size_t> sizes;
33     typedef std::valarray<std::size_t> strides;
34     v1[std::gslice(3, sizes(sz, sizeof(sz)/sizeof(sz[0])),
35                       strides(st, sizeof(st)/sizeof(st[0])))]
36         = v2[std::gslice(3, sizes(sz, sizeof(sz)/sizeof(sz[0])),
37                             strides(st, sizeof(st)/sizeof(st[0])))];
38     assert(v1.size() == 41);
39     assert(v1[ 0] ==  0);
40     assert(v1[ 1] ==  1);
41     assert(v1[ 2] ==  2);
42     assert(v1[ 3] == -3);
43     assert(v1[ 4] == -4);
44     assert(v1[ 5] == -5);
45     assert(v1[ 6] ==  6);
46     assert(v1[ 7] == -7);
47     assert(v1[ 8] == -8);
48     assert(v1[ 9] == -9);
49     assert(v1[10] == 10);
50     assert(v1[11] == -11);
51     assert(v1[12] == -12);
52     assert(v1[13] == -13);
53     assert(v1[14] == 14);
54     assert(v1[15] == -15);
55     assert(v1[16] == -16);
56     assert(v1[17] == -17);
57     assert(v1[18] == 18);
58     assert(v1[19] == 19);
59     assert(v1[20] == 20);
60     assert(v1[21] == 21);
61     assert(v1[22] == -22);
62     assert(v1[23] == -23);
63     assert(v1[24] == -24);
64     assert(v1[25] == 25);
65     assert(v1[26] == -26);
66     assert(v1[27] == -27);
67     assert(v1[28] == -28);
68     assert(v1[29] == 29);
69     assert(v1[30] == -30);
70     assert(v1[31] == -31);
71     assert(v1[32] == -32);
72     assert(v1[33] == 33);
73     assert(v1[34] == -34);
74     assert(v1[35] == -35);
75     assert(v1[36] == -36);
76     assert(v1[37] == 37);
77     assert(v1[38] == 38);
78     assert(v1[39] == 39);
79     assert(v1[40] == 40);
80 }
81