libstdc++-v3/testsuite/experimental/propagate_const/typedefs.cc

   1 // { dg-options "-std=gnu++14" }
   2 // { dg-do compile }
   3
   4 // Copyright (C) 2014-2015 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 moved_to 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 <experimental/propagate_const>
  22 #include <type_traits>
  23 #include <stdexcept>
  24
  25 template <typename T>
  26 using check1_t = std::experimental::fundamentals_v2::propagate_const<T>;
  27 template <typename T>
  28 using check2_t
  29 = typename std::experimental::fundamentals_v2::propagate_const<T>::element_type;
  30
  31 static_assert(std::is_same<check2_t<int*>, int>::value,
  32               "element_type must be based on the pointer");