libcxx/test/std/numerics/numarray/template.valarray/valarray.sub/slice_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 // valarray operator[](slice s) const;
  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         const std::valarray<int> v1(a1, sizeof(a1)/sizeof(a1[0]));
  25         std::valarray<int> v2 = v1[std::slice(1, 5, 3)];
  26         assert(v2.size() == 5);
  27         assert(v2[0] ==  1);
  28         assert(v2[1] ==  4);
  29         assert(v2[2] ==  7);
  30         assert(v2[3] == 10);
  31         assert(v2[4] == 13);
  32     }
  33     {
  34         int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
  35         const std::valarray<int> v1(a1, sizeof(a1)/sizeof(a1[0]));
  36         std::valarray<int> v2 = (v1 + 0)[std::slice(0, 2, 3)];
  37         assert(v2.size() == 2);
  38         assert(v2[0] ==  0);
  39         assert(v2[1] == 3);
  40     }
  41   return 0;
  42 }