libstdc++

tr2/ratio
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1 // TR2 <ratio> -*- C++ -*-
2
3 // Copyright (C) 2010-2013 Free Software Foundation, Inc.
4 //
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
9 // any later version.
10
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
15
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
19
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
24
25 /** @file tr2/ratio
26 * This is a TR2 C++ Library header.
27 */
28
29 #include <ratio>
30
31 namespace std _GLIBCXX_VISIBILITY(default)
32 {
33 namespace tr2
34 {
35 _GLIBCXX_BEGIN_NAMESPACE_VERSION
36
37 template<intmax_t _Pn, size_t _Bit,
38 bool = _Bit < static_cast<size_t>
39 (std::numeric_limits<intmax_t>::digits)>
40 struct __safe_lshift
41 { static const intmax_t __value = 0; };
42
43 template<intmax_t _Pn, size_t _Bit>
44 struct __safe_lshift<_Pn, _Bit, true>
45 { static const intmax_t __value = _Pn << _Bit; };
46
47 /// Add binary prefixes (IEC 60027-2 A.2 and ISO/IEC 80000).
48 typedef ratio<__safe_lshift<1, 10>::__value, 1> kibi;
49 typedef ratio<__safe_lshift<1, 20>::__value, 1> mebi;
50 typedef ratio<__safe_lshift<1, 30>::__value, 1> gibi;
51 typedef ratio<__safe_lshift<1, 40>::__value, 1> tebi;
52 typedef ratio<__safe_lshift<1, 50>::__value, 1> pebi;
53 typedef ratio<__safe_lshift<1, 60>::__value, 1> exbi;
54 //typedef ratio<__safe_lshift<1, 70>::__value, 1> zebi;
55 //typedef ratio<__safe_lshift<1, 80>::__value, 1> yobi;
56
57 _GLIBCXX_END_NAMESPACE_VERSION
58 }
59 }