reset_msb.hh

// This file is a part of Aurelia.
// Copyright (C) 2010  Valentin David
// Copyright (C) 2010  University of Bergen
//
// 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/>.
#ifndef __RESET_MSB_HH
# define __RESET_MSB_HH

# include "bin_log.hh"

namespace fast {

  template <typename integral_type>
  integral_type reset_msb(integral_type v) {
    static_assert(std::is_integral<integral_type>::value,
                  "Cannot use non integral types.");
    return v^(1 << bin_log(v));
  }

}

#endif