libstdc++-v3/testsuite/20_util/make_signed/requirements/typedefs-3.cc

   1 // { dg-options "-std=gnu++1y" }
   2 // { dg-do compile }
   3
   4 // Copyright (C) 2013 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 <type_traits>
  22
  23 using namespace std;
  24
  25 template<typename Trait, typename Result>
  26   using test = is_same<typename Trait::type, Result>;
  27
  28 static_assert( test<make_signed<const int>, make_signed_t<const int>>(),
  29                "make_signed_t<const int>" );
  30
  31 static_assert( test<make_signed<unsigned>, make_signed_t<unsigned>>(),
  32                "make_signed_t<unsigned>" );
  33
  34 static_assert( test<make_signed<char>, make_signed_t<char>>(),
  35                "make_signed_t<char>" );