libstdc++-v3/testsuite/20_util/decay/requirements/typedefs.cc

   1 // { dg-options "-std=gnu++11" }
   2 // { dg-do compile }
   3
   4 // 2007-05-03  Benjamin Kosnik  <bkoz@redhat.com>
   5 //
   6 // Copyright (C) 2007-2015 Free Software Foundation, Inc.
   7 //
   8 // This file is part of the GNU ISO C++ Library.  This library is free
   9 // software; you can redistribute it and/or modify it under the
  10 // terms of the GNU General Public License as published by the
  11 // Free Software Foundation; either version 3, or (at your option)
  12 // any later version.
  13 //
  14 // This library is distributed in the hope that it will be useful,
  15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 // GNU General Public License for more details.
  18 //
  19 // You should have received a copy of the GNU General Public License along
  20 // with this library; see the file COPYING3.  If not see
  21 // <http://www.gnu.org/licenses/>.
  22
  23 #include <type_traits>
  24
  25 void test01()
  26 {
  27   using std::decay;
  28   using std::is_same;
  29
  30   // Positive tests.
  31   typedef decay<bool>::type             test1_type;
  32   static_assert( is_same<test1_type, bool>(), "decay<bool>" );
  33
  34   // NB: DR 705.
  35   typedef decay<const int>::type        test2_type;
  36   static_assert( is_same<test2_type, int>(), "decay<const int>" );
  37
  38   typedef decay<int[4]>::type           test3_type;
  39   static_assert( is_same<test3_type, std::remove_extent<int[4]>::type*>(),
  40                  "decay<int[4]>" );
  41
  42   typedef void (fn_type) ();
  43   typedef decay<fn_type>::type          test4_type;
  44   static_assert( is_same<test4_type, std::add_pointer<fn_type>::type>(),
  45                  "decay<fn_type>" );
  46
  47   typedef void (cfn_type) () const;
  48   typedef decay<cfn_type>::type         test5_type;
  49   static_assert( is_same<test5_type, cfn_type>(), "decay<cfn_type>" );
  50 }