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<size_t>& vs) const;
14
15#include <valarray>
16#include <cassert>
17
18#include "test_macros.h"
19
20int 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 const std::size_t N1 = sizeof(a)/sizeof(a[0]);
28 std::size_t s[] = { 3, 4, 5, 7, 8, 9, 11, 12, 13, 15, 16, 17,
29 22, 23, 24, 26, 27, 28, 30, 31, 32, 34, 35, 36};
30 const std::size_t S = sizeof(s)/sizeof(s[0]);
31 const std::valarray<int> v1(a, N1);
32 std::valarray<std::size_t> ia(s, S);
33 std::valarray<int> v = v1[ia];
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 raw_data[] = {0,1,2,3,4,5,6,7,8,9};
62 std::size_t idx_data[] = {0,2,4,6,8};
63 const std::valarray<int> data(raw_data, sizeof(raw_data)/sizeof(raw_data[0]));
64 std::valarray<std::size_t> idx(idx_data, sizeof(idx_data)/sizeof(idx_data[0]));
65 std::valarray<int> result = (data + 0)[idx];
66 assert(result.size() == 5);
67 assert(result[0] == data[idx[0]]);
68 assert(result[1] == data[idx[1]]);
69 assert(result[2] == data[idx[2]]);
70 assert(result[3] == data[idx[3]]);
71 assert(result[4] == data[idx[4]]);
72 }
73 return 0;
74}
75

source code of libcxx/test/std/numerics/numarray/template.valarray/valarray.sub/indirect_array_const.pass.cpp