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& gs) const;
14 
15 #include <valarray>
16 #include <cassert>
17 
18 #include "test_macros.h"
19 
20 int main(int, char**)
21 {
22     {
23         int a[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
24                    12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
25                    24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
26                    36, 37, 38, 39, 40};
27         std::valarray<int> v1(a, sizeof(a)/sizeof(a[0]));
28         std::size_t sz[] = {2, 4, 3};
29         std::size_t st[] = {19, 4, 1};
30         typedef std::valarray<std::size_t> sizes;
31         typedef std::valarray<std::size_t> strides;
32         std::valarray<int> v(v1[std::gslice(3, sizes(sz, sizeof(sz)/sizeof(sz[0])),
33                                              strides(st, sizeof(st)/sizeof(st[0])))]);
34         assert(v.size() == 24);
35         assert(v[ 0] ==  3);
36         assert(v[ 1] ==  4);
37         assert(v[ 2] ==  5);
38         assert(v[ 3] ==  7);
39         assert(v[ 4] ==  8);
40         assert(v[ 5] ==  9);
41         assert(v[ 6] == 11);
42         assert(v[ 7] == 12);
43         assert(v[ 8] == 13);
44         assert(v[ 9] == 15);
45         assert(v[10] == 16);
46         assert(v[11] == 17);
47         assert(v[12] == 22);
48         assert(v[13] == 23);
49         assert(v[14] == 24);
50         assert(v[15] == 26);
51         assert(v[16] == 27);
52         assert(v[17] == 28);
53         assert(v[18] == 30);
54         assert(v[19] == 31);
55         assert(v[20] == 32);
56         assert(v[21] == 34);
57         assert(v[22] == 35);
58         assert(v[23] == 36);
59     }
60     {
61         int a[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
62                     12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
63                     24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
64                     36, 37, 38, 39, 40};
65         std::valarray<int> v1(a, sizeof(a)/sizeof(a[0]));
66         std::size_t sz[] = {2, 4, 3};
67         std::size_t st[] = {19, 4, 1};
68         typedef std::valarray<std::size_t> sizes;
69         typedef std::valarray<std::size_t> strides;
70         std::valarray<int> v((v1 + 0)[std::gslice(3, sizes(sz, sizeof(sz)/sizeof(sz[0])),
71                                             strides(st, sizeof(st)/sizeof(st[0])))]);
72         assert(v.size() == 24);
73         assert(v[ 0] ==  3);
74         assert(v[ 1] ==  4);
75         assert(v[ 2] ==  5);
76         assert(v[ 3] ==  7);
77         assert(v[ 4] ==  8);
78         assert(v[ 5] ==  9);
79         assert(v[ 6] == 11);
80         assert(v[ 7] == 12);
81         assert(v[ 8] == 13);
82         assert(v[ 9] == 15);
83         assert(v[10] == 16);
84         assert(v[11] == 17);
85         assert(v[12] == 22);
86         assert(v[13] == 23);
87         assert(v[14] == 24);
88         assert(v[15] == 26);
89         assert(v[16] == 27);
90         assert(v[17] == 28);
91         assert(v[18] == 30);
92         assert(v[19] == 31);
93         assert(v[20] == 32);
94         assert(v[21] == 34);
95         assert(v[22] == 35);
96         assert(v[23] == 36);
97     }
98   return 0;
99 }
100