typetraits.H

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/*
  This file is part of Designar.
  Copyright (C) 2017 by Alejandro J. Mujica

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.

  Any user request of this software, write to 

  Alejandro Mujica

  aledrums@gmail.com
*/

# ifndef DSGTYPETRAITS_H
# define DSGTYPETRAITS_H

# include <type_traits>

namespace Designar
{

  template <typename To, typename FromHead, typename ...FromTail>
  struct AllAreConvertible
  {
    static constexpr bool value =
      std::is_convertible<FromHead, To>::value and
      AllAreConvertible<To, FromTail...>::value;
  };
  
  template <typename To, typename From>
  struct AllAreConvertible<To, From>
  {
    static constexpr bool value = std::is_convertible<From, To>::value;
  };
  
} // end namespace Designar

# endif // DSGTYPETRAITS_H