libcxx/test/std/numerics/numarray/template.slice.array/slice.arr.assign/slice_array.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 slice_array
  12
  13 // const slice_array& operator=(const slice_array& sa) 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     int a2[] = {-1, -2, -3, -4, -5, -6, -7, -8, -9, -10, -11, -12};
  25     std::valarray<int> v1(a1, sizeof(a1)/sizeof(a1[0]));
  26     const std::valarray<int> v2(a2, sizeof(a2)/sizeof(a2[0]));
  27     v1[std::slice(1, 5, 3)] = v2[std::slice(2, 5, 2)];
  28     assert(v1.size() == 16);
  29     assert(v1[ 0] ==  0);
  30     assert(v1[ 1] == -3);
  31     assert(v1[ 2] ==  2);
  32     assert(v1[ 3] ==  3);
  33     assert(v1[ 4] == -5);
  34     assert(v1[ 5] ==  5);
  35     assert(v1[ 6] ==  6);
  36     assert(v1[ 7] == -7);
  37     assert(v1[ 8] ==  8);
  38     assert(v1[ 9] ==  9);
  39     assert(v1[10] == -9);
  40     assert(v1[11] == 11);
  41     assert(v1[12] == 12);
  42     assert(v1[13] == -11);
  43     assert(v1[14] == 14);
  44     assert(v1[15] == 15);
  45     }
  46     // Test return value of assignment.
  47     {
  48     int a1[] = {0, 1, 2};
  49     std::valarray<int> v1(a1, 3);
  50     std::slice_array<int> s1 = v1[std::slice(1, 1, 1)];
  51     std::slice_array<int> s2 = v1[std::slice(0, 1, 1)];
  52     std::slice_array<int> const & s3 = (s1 = s2);
  53     assert(&s1 == &s3);
  54     }
  55
  56   return 0;
  57 }