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

   1 // { dg-do compile { target c++11 } }
   2
   3 // 2007-05-03  Benjamin Kosnik  <bkoz@redhat.com>
   4 //
   5 // Copyright (C) 2007-2020 Free Software Foundation, Inc.
   6 //
   7 // This file is part of the GNU ISO C++ Library.  This library is free
   8 // software; you can redistribute it and/or modify it under the
   9 // terms of the GNU General Public License as published by the
  10 // Free Software Foundation; either version 3, or (at your option)
  11 // any later version.
  12 //
  13 // This library is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17 //
  18 // You should have received a copy of the GNU General Public License along
  19 // with this library; see the file COPYING3.  If not see
  20 // <http://www.gnu.org/licenses/>.
  21
  22 #include <type_traits>
  23
  24 void test01()
  25 {
  26   using std::decay;
  27   using std::is_same;
  28
  29   // Positive tests.
  30   typedef decay<bool>::type             test1_type;
  31   static_assert( is_same<test1_type, bool>(), "decay<bool>" );
  32
  33   // NB: DR 705.
  34   typedef decay<const int>::type        test2_type;
  35   static_assert( is_same<test2_type, int>(), "decay<const int>" );
  36
  37   typedef decay<int[4]>::type           test3_type;
  38   static_assert( is_same<test3_type, std::remove_extent<int[4]>::type*>(),
  39                  "decay<int[4]>" );
  40
  41   typedef void (fn_type) ();
  42   typedef decay<fn_type>::type          test4_type;
  43   static_assert( is_same<test4_type, std::add_pointer<fn_type>::type>(),
  44                  "decay<fn_type>" );
  45
  46   typedef void (cfn_type) () const;
  47   typedef decay<cfn_type>::type         test5_type;
  48   static_assert( is_same<test5_type, cfn_type>(), "decay<cfn_type>" );
  49 }