libcxx/test/std/numerics/numarray/template.valarray/valarray.sub/valarray_bool_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[](const valarray<bool>& vb) const;
  14
  15 #include <valarray>
  16 #include <cassert>
  17
  18 #include "test_macros.h"
  19
  20
  21 int main(int, char**)
  22 {
  23     {
  24     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
  25     const std::size_t N1 = sizeof(a1)/sizeof(a1[0]);
  26     bool b[N1] = {true,  false, false, true,  true,  false,
  27                   false, true,  false, false, false, true};
  28     std::valarray<int> v1(a1, N1);
  29     std::valarray<bool> vb(b, N1);
  30     std::valarray<int> v2(v1[vb]);
  31     assert(v2.size() == 5);
  32     assert(v2[ 0] ==  0);
  33     assert(v2[ 1] ==  3);
  34     assert(v2[ 2] ==  4);
  35     assert(v2[ 3] ==  7);
  36     assert(v2[ 4] == 11);
  37     }
  38     {
  39         int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
  40         const std::size_t N1 = sizeof(a1)/sizeof(a1[0]);
  41         bool b[N1] = {true,  false, false, true,  true,  false,
  42                       false, true,  false, false, false, true};
  43         std::valarray<int> v1(a1, N1);
  44         std::valarray<bool> vb(b, N1);
  45         std::valarray<int> v2((v1 - 1)[vb]);
  46         assert(v2.size() == 5);
  47         assert(v2[ 0] ==  -1);
  48         assert(v2[ 1] ==  2);
  49         assert(v2[ 2] ==  3);
  50         assert(v2[ 3] ==  6);
  51         assert(v2[ 4] == 10);
  52     }
  53   return 0;
  54 }