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      1 //===----------------------------------------------------------------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is dual licensed under the MIT and the University of Illinois Open
      6 // Source Licenses. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 
     10 // <complex>
     11 
     12 // template<class T>
     13 //   complex<T>
     14 //   atan(const complex<T>& x);
     15 
     16 #include <complex>
     17 #include <cassert>
     18 
     19 #include "../cases.h"
     20 
     21 template <class T>
     22 void
     23 test(const std::complex<T>& c, std::complex<T> x)
     24 {
     25     assert(atan(c) == x);
     26 }
     27 
     28 template <class T>
     29 void
     30 test()
     31 {
     32     test(std::complex<T>(0, 0), std::complex<T>(0, 0));
     33 }
     34 
     35 void test_edges()
     36 {
     37     typedef std::complex<double> C;
     38     const unsigned N = sizeof(x) / sizeof(x[0]);
     39     for (unsigned i = 0; i < N; ++i)
     40     {
     41         std::complex<double> r = atan(x[i]);
     42         std::complex<double> t1(-imag(x[i]), real(x[i]));
     43         std::complex<double> t2 = atanh(t1);
     44         std::complex<double> z(imag(t2), -real(t2));
     45         if (std::isnan(real(r)))
     46             assert(std::isnan(real(z)));
     47         else
     48         {
     49             assert(real(r) == real(z));
     50             assert(std::signbit(real(r)) == std::signbit(real(z)));
     51         }
     52         if (std::isnan(imag(r)))
     53             assert(std::isnan(imag(z)));
     54         else
     55         {
     56             assert(imag(r) == imag(z));
     57             assert(std::signbit(imag(r)) == std::signbit(imag(z)));
     58         }
     59     }
     60 }
     61 
     62 int main()
     63 {
     64     test<float>();
     65     test<double>();
     66     test<long double>();
     67     test_edges();
     68 }
     69