libstdc++-v3/testsuite/26_numerics/complex/dr844.cc

   1 // { dg-do run { target c++11 } }
   2 // 2008-06-12  Paolo Carlini  <paolo.carlini@oracle.com>
   3 //
   4 // Copyright (C) 2008-2020 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11 //
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 #include <complex>
  22 #include <testsuite_hooks.h>
  23 #include <testsuite_tr1.h>
  24
  25 // In C++11 mode we used to implement the resolution of
  26 // DR 844. complex pow return type is ambiguous.
  27 // However, doing that causes all sorts of issues, see, for example:
  28 //   http://gcc.gnu.org/ml/libstdc++/2013-01/msg00058.html
  29 // and also PR57974.
  30 void test01()
  31 {
  32   using __gnu_test::check_ret_type;
  33
  34   typedef std::complex<float>       cmplx_f_type;
  35   typedef std::complex<double>      cmplx_d_type;
  36   typedef std::complex<long double> cmplx_ld_type;
  37
  38   const int          i1 = 1;
  39   const float        f1 = 1.0f;
  40   const double       d1 = 1.0;
  41   const long double ld1 = 1.0l;
  42
  43   check_ret_type<cmplx_f_type>(std::pow(cmplx_f_type(f1, f1), i1));
  44   check_ret_type<cmplx_d_type>(std::pow(cmplx_d_type(d1, d1), i1));
  45   check_ret_type<cmplx_ld_type>(std::pow(cmplx_ld_type(ld1, ld1), i1));
  46 }
  47
  48 int main()
  49 {
  50   test01();
  51   return 0;
  52 }