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 // slice_array<value_type> operator[](slice s);
14 
15 #include <valarray>
16 #include <cassert>
17 
18 int main(int, char**)
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};
23         std::valarray<int> v1(a1, sizeof(a1)/sizeof(a1[0]));
24         std::valarray<int> v2(a2, sizeof(a2)/sizeof(a2[0]));
25         v1[std::slice(1, 5, 3)] = v2;
26         assert(v1.size() == 16);
27         assert(v1[ 0] ==  0);
28         assert(v1[ 1] == -1);
29         assert(v1[ 2] ==  2);
30         assert(v1[ 3] ==  3);
31         assert(v1[ 4] == -2);
32         assert(v1[ 5] ==  5);
33         assert(v1[ 6] ==  6);
34         assert(v1[ 7] == -3);
35         assert(v1[ 8] ==  8);
36         assert(v1[ 9] ==  9);
37         assert(v1[10] == -4);
38         assert(v1[11] == 11);
39         assert(v1[12] == 12);
40         assert(v1[13] == -5);
41         assert(v1[14] == 14);
42         assert(v1[15] == 15);
43     }
44     {
45         int a1[] = {0, 1, 2, 3, 4, 5};
46         std::valarray<int> v1(a1, sizeof(a1)/sizeof(a1[0]));
47         std::valarray<int> v2((v1 + 0)[std::slice(0, 3, 2)]);
48         assert(v2.size() == 3);
49         assert(v2[0] == 0);
50         assert(v2[1] == 2);
51         assert(v2[2] == 4);
52     }
53   return 0;
54 }
55