libcxx

libcxx mirror with random patches
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acos.pass.cpp (4821B)

      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 //   acos(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(acos(c) == x);
     26 }
     27 
     28 template <class T>
     29 void
     30 test()
     31 {
     32     test(std::complex<T>(INFINITY, 1), std::complex<T>(0, -INFINITY));
     33 }
     34 
     35 void test_edges()
     36 {
     37     const double pi = std::atan2(+0., -0.);
     38     const unsigned N = sizeof(testcases) / sizeof(testcases[0]);
     39     for (unsigned i = 0; i < N; ++i)
     40     {
     41         std::complex<double> r = acos(testcases[i]);
     42         if (testcases[i].real() == 0 && testcases[i].imag() == 0)
     43         {
     44             is_about(r.real(), pi/2);
     45             assert(r.imag() == 0);
     46             assert(std::signbit(testcases[i].imag()) != std::signbit(r.imag()));
     47         }
     48         else if (testcases[i].real() == 0 && std::isnan(testcases[i].imag()))
     49         {
     50             is_about(r.real(), pi/2);
     51             assert(std::isnan(r.imag()));
     52         }
     53         else if (std::isfinite(testcases[i].real()) && std::isinf(testcases[i].imag()))
     54         {
     55             is_about(r.real(), pi/2);
     56             assert(std::isinf(r.imag()));
     57             assert(std::signbit(testcases[i].imag()) != std::signbit(r.imag()));
     58         }
     59         else if (std::isfinite(testcases[i].real()) && testcases[i].real() != 0 && std::isnan(testcases[i].imag()))
     60         {
     61             assert(std::isnan(r.real()));
     62             assert(std::isnan(r.imag()));
     63         }
     64         else if (std::isinf(testcases[i].real()) && testcases[i].real() < 0 && std::isfinite(testcases[i].imag()))
     65         {
     66             is_about(r.real(), pi);
     67             assert(std::isinf(r.imag()));
     68             assert(std::signbit(testcases[i].imag()) != std::signbit(r.imag()));
     69         }
     70         else if (std::isinf(testcases[i].real()) && testcases[i].real() > 0 && std::isfinite(testcases[i].imag()))
     71         {
     72             assert(r.real() == 0);
     73             assert(!std::signbit(r.real()));
     74             assert(std::isinf(r.imag()));
     75             assert(std::signbit(testcases[i].imag()) != std::signbit(r.imag()));
     76         }
     77         else if (std::isinf(testcases[i].real()) && testcases[i].real() < 0 && std::isinf(testcases[i].imag()))
     78         {
     79             is_about(r.real(), 0.75 * pi);
     80             assert(std::isinf(r.imag()));
     81             assert(std::signbit(testcases[i].imag()) != std::signbit(r.imag()));
     82         }
     83         else if (std::isinf(testcases[i].real()) && testcases[i].real() > 0 && std::isinf(testcases[i].imag()))
     84         {
     85             is_about(r.real(), 0.25 * pi);
     86             assert(std::isinf(r.imag()));
     87             assert(std::signbit(testcases[i].imag()) != std::signbit(r.imag()));
     88         }
     89         else if (std::isinf(testcases[i].real()) && std::isnan(testcases[i].imag()))
     90         {
     91             assert(std::isnan(r.real()));
     92             assert(std::isinf(r.imag()));
     93         }
     94         else if (std::isnan(testcases[i].real()) && std::isfinite(testcases[i].imag()))
     95         {
     96             assert(std::isnan(r.real()));
     97             assert(std::isnan(r.imag()));
     98         }
     99         else if (std::isnan(testcases[i].real()) && std::isinf(testcases[i].imag()))
    100         {
    101             assert(std::isnan(r.real()));
    102             assert(std::isinf(r.imag()));
    103             assert(std::signbit(testcases[i].imag()) != std::signbit(r.imag()));
    104         }
    105         else if (std::isnan(testcases[i].real()) && std::isnan(testcases[i].imag()))
    106         {
    107             assert(std::isnan(r.real()));
    108             assert(std::isnan(r.imag()));
    109         }
    110         else if (!std::signbit(testcases[i].real()) && !std::signbit(testcases[i].imag()))
    111         {
    112             assert(!std::signbit(r.real()));
    113             assert( std::signbit(r.imag()));
    114         }
    115         else if (std::signbit(testcases[i].real()) && !std::signbit(testcases[i].imag()))
    116         {
    117             assert(!std::signbit(r.real()));
    118             assert( std::signbit(r.imag()));
    119         }
    120         else if (std::signbit(testcases[i].real()) && std::signbit(testcases[i].imag()))
    121         {
    122             assert(!std::signbit(r.real()));
    123             assert(!std::signbit(r.imag()));
    124         }
    125         else if (!std::signbit(testcases[i].real()) && std::signbit(testcases[i].imag()))
    126         {
    127             assert(!std::signbit(r.real()));
    128             assert(!std::signbit(r.imag()));
    129         }
    130     }
    131 }
    132 
    133 int main()
    134 {
    135     test<float>();
    136     test<double>();
    137     test<long double>();
    138     test_edges();
    139 }