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 valarray<bool>& vb) const;
14 
15 #include <valarray>
16 #include <cassert>
17 
18 
19 int main(int, char**)
20 {
21     {
22     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
23     const std::size_t N1 = sizeof(a1)/sizeof(a1[0]);
24     bool b[N1] = {true,  false, false, true,  true,  false,
25                   false, true,  false, false, false, true};
26     std::valarray<int> v1(a1, N1);
27     std::valarray<bool> vb(b, N1);
28     std::valarray<int> v2(v1[vb]);
29     assert(v2.size() == 5);
30     assert(v2[ 0] ==  0);
31     assert(v2[ 1] ==  3);
32     assert(v2[ 2] ==  4);
33     assert(v2[ 3] ==  7);
34     assert(v2[ 4] == 11);
35     }
36     {
37         int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
38         const std::size_t N1 = sizeof(a1)/sizeof(a1[0]);
39         bool b[N1] = {true,  false, false, true,  true,  false,
40                       false, true,  false, false, false, true};
41         std::valarray<int> v1(a1, N1);
42         std::valarray<bool> vb(b, N1);
43         std::valarray<int> v2((v1 - 1)[vb]);
44         assert(v2.size() == 5);
45         assert(v2[ 0] ==  -1);
46         assert(v2[ 1] ==  2);
47         assert(v2[ 2] ==  3);
48         assert(v2[ 3] ==  6);
49         assert(v2[ 4] == 10);
50     }
51   return 0;
52 }
53