libstdc++: ratio Source File

libstdc++

tr2/ratio
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1// TR2 <ratio> -*- C++ -*-
2
3// Copyright (C) 2010-2026 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
31namespace std _GLIBCXX_VISIBILITY(default)
32{
33_GLIBCXX_BEGIN_NAMESPACE_VERSION
34
35namespace tr2
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
58_GLIBCXX_END_NAMESPACE_VERSION
59}
std
ISO C++ entities toplevel namespace is std.
std::tr2
Namespace for non-standard "TR2" extensions.
std::__numeric_limits_base::digits
static constexpr int digits
Definition limits:224
ratio