gdb/common/traits.h

   1 /* Copyright (C) 2017 Free Software Foundation, Inc.
   2
   3    This file is part of GDB.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef COMMON_TRAITS_H
  19 #define COMMON_TRAITS_H
  20
  21 namespace gdb {
  22
  23 /* Pre C++14-safe (CWG 1558) version of C++17's std::void_t.  See
  24    <http://en.cppreference.com/w/cpp/types/void_t>.  */
  25
  26 template<typename... Ts>
  27 struct make_void { typedef void type; };
  28
  29 template<typename... Ts>
  30 using void_t = typename make_void<Ts...>::type;
  31
  32 }
  33
  34 #endif /* COMMON_TRAITS_H */