1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is dual licensed under the MIT and the University of Illinois Open
6// Source Licenses. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// <valarray>
11
12// template<class T> class valarray;
13
14// valarray operator[](const gslice& gs) const;
15
16#include <valarray>
17#include <cassert>
18
19int main()
20{
21    int a[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
22               12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
23               24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
24               36, 37, 38, 39, 40};
25    std::valarray<int> v1(a, sizeof(a)/sizeof(a[0]));
26    std::size_t sz[] = {2, 4, 3};
27    std::size_t st[] = {19, 4, 1};
28    typedef std::valarray<std::size_t> sizes;
29    typedef std::valarray<std::size_t> strides;
30    std::valarray<int> 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