libcxx/test/std/numerics/numarray/template.valarray/valarray.unary/plus.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;
  14
  15 #include <valarray>
  16 #include <cassert>
  17 #include <cstddef>
  18
  19 #include "test_macros.h"
  20
  21 int main(int, char**)
  22 {
  23     {
  24         typedef int T;
  25         T a[] = {1, 2, 3, 4, 5};
  26         const unsigned N = sizeof(a)/sizeof(a[0]);
  27         std::valarray<T> v(a, N);
  28         std::valarray<T> v2 = +v;
  29         assert(v2.size() == v.size());
  30         for (std::size_t i = 0; i < v2.size(); ++i)
  31             assert(v2[i] == +v[i]);
  32     }
  33     {
  34         typedef double T;
  35         T a[] = {1, 2.5, 3, 4.25, 5};
  36         const unsigned N = sizeof(a)/sizeof(a[0]);
  37         std::valarray<T> v(a, N);
  38         std::valarray<T> v2 = +v;
  39         assert(v2.size() == v.size());
  40         for (std::size_t i = 0; i < v2.size(); ++i)
  41             assert(v2[i] == +v[i]);
  42     }
  43     {
  44         typedef std::valarray<double> T;
  45         T a[] = {T(1), T(2), T(3), T(4), T(5)};
  46         const unsigned N = sizeof(a)/sizeof(a[0]);
  47         std::valarray<T> v(a, N);
  48         std::valarray<T> v2 = +v;
  49         assert(v2.size() == v.size());
  50         for (unsigned i = 0; i < N; ++i)
  51         {
  52             assert(v2[i].size() == v[i].size());
  53             for (std::size_t j = 0; j < v[i].size(); ++j)
  54                 assert(v2[i][j] == +v[i][j]);
  55         }
  56     }
  57     {
  58         typedef double T;
  59         T a[] = {1, 2.5, 3, 4.25, 5};
  60         const unsigned N = sizeof(a)/sizeof(a[0]);
  61         std::valarray<T> v(a, N);
  62         std::valarray<T> v2 = +(v + v);
  63         assert(v2.size() == v.size());
  64         for (std::size_t i = 0; i < v2.size(); ++i)
  65             assert(v2[i] == +2*v[i]);
  66     }
  67     {
  68         // Make sure we don't have dangling reference problems with unary expressions
  69         int array[] = {1, 2, 3};
  70         std::valarray<int> a(array, 3);
  71         std::valarray<int> b(array, 3);
  72         auto c = +a * b;
  73         assert(c.size() == 3);
  74         assert(c[0] == 1 && c[1] == 4 && c[2] == 9);
  75     }
  76
  77     return 0;
  78 }