libcxx/test/std/numerics/numarray/template.valarray/valarray.sub/slice_non_const.pass.cpp

   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 #include "test_macros.h"
  19
  20 int main(int, char**)
  21 {
  22     {
  23         int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
  24         int a2[] = {-1, -2, -3, -4, -5};
  25         std::valarray<int> v1(a1, sizeof(a1)/sizeof(a1[0]));
  26         std::valarray<int> v2(a2, sizeof(a2)/sizeof(a2[0]));
  27         v1[std::slice(1, 5, 3)] = v2;
  28         assert(v1.size() == 16);
  29         assert(v1[ 0] ==  0);
  30         assert(v1[ 1] == -1);
  31         assert(v1[ 2] ==  2);
  32         assert(v1[ 3] ==  3);
  33         assert(v1[ 4] == -2);
  34         assert(v1[ 5] ==  5);
  35         assert(v1[ 6] ==  6);
  36         assert(v1[ 7] == -3);
  37         assert(v1[ 8] ==  8);
  38         assert(v1[ 9] ==  9);
  39         assert(v1[10] == -4);
  40         assert(v1[11] == 11);
  41         assert(v1[12] == 12);
  42         assert(v1[13] == -5);
  43         assert(v1[14] == 14);
  44         assert(v1[15] == 15);
  45     }
  46     {
  47         int a1[] = {0, 1, 2, 3, 4, 5};
  48         std::valarray<int> v1(a1, sizeof(a1)/sizeof(a1[0]));
  49         std::valarray<int> v2((v1 + 0)[std::slice(0, 3, 2)]);
  50         assert(v2.size() == 3);
  51         assert(v2[0] == 0);
  52         assert(v2[1] == 2);
  53         assert(v2[2] == 4);
  54     }
  55   return 0;
  56 }