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편집 파일: ratio

// TR2 <ratio> -*- C++ -*-

// Copyright (C) 2010-2021 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library 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, or (at your option)
// any later version.

// This library 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.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/** @file tr2/ratio
 *  This is a TR2 C++ Library header.
 */

#include <ratio>

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

namespace tr2
{
  template<intmax_t _Pn, size_t _Bit,
	     bool = _Bit < static_cast<size_t>
			  (std::numeric_limits<intmax_t>::digits)>
    struct __safe_lshift
    { static const intmax_t __value = 0; };

template<intmax_t _Pn, size_t _Bit>
      struct __safe_lshift<_Pn, _Bit, true>
      { static const intmax_t __value = _Pn << _Bit; };

/// Add binary prefixes (IEC 60027-2 A.2 and ISO/IEC 80000).
  typedef ratio<__safe_lshift<1, 10>::__value, 1> kibi;
  typedef ratio<__safe_lshift<1, 20>::__value, 1> mebi;
  typedef ratio<__safe_lshift<1, 30>::__value, 1> gibi;
  typedef ratio<__safe_lshift<1, 40>::__value, 1> tebi;
  typedef ratio<__safe_lshift<1, 50>::__value, 1> pebi;
  typedef ratio<__safe_lshift<1, 60>::__value, 1> exbi;
  //typedef ratio<__safe_lshift<1, 70>::__value, 1> zebi;
  //typedef ratio<__safe_lshift<1, 80>::__value, 1> yobi;
}

_GLIBCXX_END_NAMESPACE_VERSION
}

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