libcxx/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan2_value_valarray.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 // template<class T>
  14 //   valarray<T>
  15 //   atan2(const T& x, const valarray<T>& y);
  16
  17 #include <valarray>
  18 #include <cassert>
  19 #include <cstddef>
  20
  21 #include "test_macros.h"
  22 #include "valarray_helper.h"
  23
  24 int main(int, char**)
  25 {
  26     {
  27         typedef double T;
  28         T a1[] = {-.9, -.5, 0., .5, .75};
  29         T a3[] = {2.4468543773930902e+00,
  30                   2.1587989303424640e+00,
  31                   1.5707963267948966e+00,
  32                   9.8279372324732905e-01,
  33                   7.8539816339744828e-01};
  34         const unsigned N = sizeof(a1)/sizeof(a1[0]);
  35         std::valarray<T> v1(a1, N);
  36         std::valarray<T> v3 = atan2(.75, v1);
  37         assert(v3.size() == v1.size());
  38         for (std::size_t i = 0; i < v3.size(); ++i)
  39             assert(is_about(v3[i], a3[i], 10));
  40     }
  41
  42   return 0;
  43 }