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295 lines
7.8 KiB
C++
295 lines
7.8 KiB
C++
// Components for compile-time parsing of numbers -*- C++ -*-
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// Copyright (C) 2013-2019 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file bits/parse_numbers.h
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{chrono}
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*/
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#ifndef _GLIBCXX_PARSE_NUMBERS_H
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#define _GLIBCXX_PARSE_NUMBERS_H 1
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#pragma GCC system_header
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// From n3642.pdf except I added binary literals and digit separator '\''.
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#if __cplusplus > 201103L
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#include <limits>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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namespace __parse_int
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{
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template<unsigned _Base, char _Dig>
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struct _Digit;
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template<unsigned _Base>
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struct _Digit<_Base, '0'> : integral_constant<unsigned, 0>
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{
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using __valid = true_type;
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};
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template<unsigned _Base>
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struct _Digit<_Base, '1'> : integral_constant<unsigned, 1>
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{
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using __valid = true_type;
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};
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template<unsigned _Base, unsigned _Val>
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struct _Digit_impl : integral_constant<unsigned, _Val>
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{
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static_assert(_Base > _Val, "invalid digit");
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using __valid = true_type;
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};
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template<unsigned _Base>
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struct _Digit<_Base, '2'> : _Digit_impl<_Base, 2>
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{ };
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template<unsigned _Base>
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struct _Digit<_Base, '3'> : _Digit_impl<_Base, 3>
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{ };
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template<unsigned _Base>
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struct _Digit<_Base, '4'> : _Digit_impl<_Base, 4>
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{ };
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template<unsigned _Base>
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struct _Digit<_Base, '5'> : _Digit_impl<_Base, 5>
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{ };
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template<unsigned _Base>
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struct _Digit<_Base, '6'> : _Digit_impl<_Base, 6>
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{ };
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template<unsigned _Base>
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struct _Digit<_Base, '7'> : _Digit_impl<_Base, 7>
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{ };
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template<unsigned _Base>
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struct _Digit<_Base, '8'> : _Digit_impl<_Base, 8>
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{ };
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template<unsigned _Base>
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struct _Digit<_Base, '9'> : _Digit_impl<_Base, 9>
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{ };
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template<unsigned _Base>
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struct _Digit<_Base, 'a'> : _Digit_impl<_Base, 0xa>
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{ };
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template<unsigned _Base>
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struct _Digit<_Base, 'A'> : _Digit_impl<_Base, 0xa>
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{ };
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template<unsigned _Base>
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struct _Digit<_Base, 'b'> : _Digit_impl<_Base, 0xb>
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{ };
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template<unsigned _Base>
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struct _Digit<_Base, 'B'> : _Digit_impl<_Base, 0xb>
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{ };
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template<unsigned _Base>
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struct _Digit<_Base, 'c'> : _Digit_impl<_Base, 0xc>
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{ };
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template<unsigned _Base>
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struct _Digit<_Base, 'C'> : _Digit_impl<_Base, 0xc>
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{ };
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template<unsigned _Base>
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struct _Digit<_Base, 'd'> : _Digit_impl<_Base, 0xd>
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{ };
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template<unsigned _Base>
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struct _Digit<_Base, 'D'> : _Digit_impl<_Base, 0xd>
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{ };
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template<unsigned _Base>
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struct _Digit<_Base, 'e'> : _Digit_impl<_Base, 0xe>
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{ };
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template<unsigned _Base>
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struct _Digit<_Base, 'E'> : _Digit_impl<_Base, 0xe>
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{ };
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template<unsigned _Base>
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struct _Digit<_Base, 'f'> : _Digit_impl<_Base, 0xf>
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{ };
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template<unsigned _Base>
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struct _Digit<_Base, 'F'> : _Digit_impl<_Base, 0xf>
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{ };
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// Digit separator
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template<unsigned _Base>
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struct _Digit<_Base, '\''> : integral_constant<unsigned, 0>
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{
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using __valid = false_type;
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};
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//------------------------------------------------------------------------------
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template<unsigned long long _Val>
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using __ull_constant = integral_constant<unsigned long long, _Val>;
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template<unsigned _Base, char _Dig, char... _Digs>
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struct _Power_help
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{
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using __next = typename _Power_help<_Base, _Digs...>::type;
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using __valid_digit = typename _Digit<_Base, _Dig>::__valid;
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using type
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= __ull_constant<__next::value * (__valid_digit{} ? _Base : 1ULL)>;
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};
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template<unsigned _Base, char _Dig>
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struct _Power_help<_Base, _Dig>
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{
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using __valid_digit = typename _Digit<_Base, _Dig>::__valid;
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using type = __ull_constant<__valid_digit::value>;
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};
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template<unsigned _Base, char... _Digs>
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struct _Power : _Power_help<_Base, _Digs...>::type
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{ };
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template<unsigned _Base>
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struct _Power<_Base> : __ull_constant<0>
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{ };
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//------------------------------------------------------------------------------
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template<unsigned _Base, unsigned long long _Pow, char _Dig, char... _Digs>
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struct _Number_help
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{
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using __digit = _Digit<_Base, _Dig>;
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using __valid_digit = typename __digit::__valid;
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using __next = _Number_help<_Base,
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__valid_digit::value ? _Pow / _Base : _Pow,
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_Digs...>;
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using type = __ull_constant<_Pow * __digit::value + __next::type::value>;
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static_assert((type::value / _Pow) == __digit::value,
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"integer literal does not fit in unsigned long long");
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};
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// Skip past digit separators:
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template<unsigned _Base, unsigned long long _Pow, char _Dig, char..._Digs>
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struct _Number_help<_Base, _Pow, '\'', _Dig, _Digs...>
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: _Number_help<_Base, _Pow, _Dig, _Digs...>
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{ };
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// Terminating case for recursion:
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template<unsigned _Base, char _Dig>
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struct _Number_help<_Base, 1ULL, _Dig>
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{
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using type = __ull_constant<_Digit<_Base, _Dig>::value>;
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};
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template<unsigned _Base, char... _Digs>
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struct _Number
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: _Number_help<_Base, _Power<_Base, _Digs...>::value, _Digs...>::type
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{ };
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template<unsigned _Base>
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struct _Number<_Base>
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: __ull_constant<0>
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{ };
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//------------------------------------------------------------------------------
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template<char... _Digs>
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struct _Parse_int;
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template<char... _Digs>
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struct _Parse_int<'0', 'b', _Digs...>
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: _Number<2U, _Digs...>::type
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{ };
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template<char... _Digs>
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struct _Parse_int<'0', 'B', _Digs...>
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: _Number<2U, _Digs...>::type
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{ };
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template<char... _Digs>
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struct _Parse_int<'0', 'x', _Digs...>
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: _Number<16U, _Digs...>::type
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{ };
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template<char... _Digs>
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struct _Parse_int<'0', 'X', _Digs...>
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: _Number<16U, _Digs...>::type
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{ };
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template<char... _Digs>
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struct _Parse_int<'0', _Digs...>
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: _Number<8U, _Digs...>::type
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{ };
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template<char... _Digs>
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struct _Parse_int
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: _Number<10U, _Digs...>::type
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{ };
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} // namespace __parse_int
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namespace __select_int
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{
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template<unsigned long long _Val, typename... _Ints>
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struct _Select_int_base;
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template<unsigned long long _Val, typename _IntType, typename... _Ints>
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struct _Select_int_base<_Val, _IntType, _Ints...>
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: conditional_t<(_Val <= std::numeric_limits<_IntType>::max()),
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integral_constant<_IntType, _Val>,
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_Select_int_base<_Val, _Ints...>>
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{ };
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template<unsigned long long _Val>
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struct _Select_int_base<_Val>
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{ };
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template<char... _Digs>
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using _Select_int = typename _Select_int_base<
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__parse_int::_Parse_int<_Digs...>::value,
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unsigned char,
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unsigned short,
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unsigned int,
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unsigned long,
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unsigned long long
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>::type;
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} // namespace __select_int
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace std
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#endif // __cplusplus > 201103L
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#endif // _GLIBCXX_PARSE_NUMBERS_H
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