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 valarray;
12 
13 // valarray& operator=(const gslice_array<value_type>& ga);
14 
15 #include <valarray>
16 #include <cassert>
17 
18 int main()
19 {
20     int a[] = { 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     std::valarray<int> v1(a, sizeof(a)/sizeof(a[0]));
25     std::size_t sz[] = {2, 4, 3};
26     std::size_t st[] = {19, 4, 1};
27     typedef std::valarray<std::size_t> sizes;
28     typedef std::valarray<std::size_t> strides;
29     std::valarray<int> v(24);
30     v = v1[std::gslice(3, sizes(sz, sizeof(sz)/sizeof(sz[0])),
31                           strides(st, sizeof(st)/sizeof(st[0])))];
32     assert(v.size() == 24);
33     assert(v[ 0] ==  3);
34     assert(v[ 1] ==  4);
35     assert(v[ 2] ==  5);
36     assert(v[ 3] ==  7);
37     assert(v[ 4] ==  8);
38     assert(v[ 5] ==  9);
39     assert(v[ 6] == 11);
40     assert(v[ 7] == 12);
41     assert(v[ 8] == 13);
42     assert(v[ 9] == 15);
43     assert(v[10] == 16);
44     assert(v[11] == 17);
45     assert(v[12] == 22);
46     assert(v[13] == 23);
47     assert(v[14] == 24);
48     assert(v[15] == 26);
49     assert(v[16] == 27);
50     assert(v[17] == 28);
51     assert(v[18] == 30);
52     assert(v[19] == 31);
53     assert(v[20] == 32);
54     assert(v[21] == 34);
55     assert(v[22] == 35);
56     assert(v[23] == 36);
57 }
58