16 KiB
16 KiB
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Line data Source code 1 : // Numeric conversions (to_string, to_chars) -*- C++ -*- 2 : 3 : // Copyright (C) 2017-2023 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 bits/charconv.h 26 : * This is an internal header file, included by other library headers. 27 : * Do not attempt to use it directly. @headername{charconv} 28 : */ 29 : 30 : #ifndef _GLIBCXX_CHARCONV_H 31 : #define _GLIBCXX_CHARCONV_H 1 32 : 33 : #pragma GCC system_header 34 : 35 : #if __cplusplus >= 201103L 36 : 37 : #include <type_traits> 38 : #include <ext/numeric_traits.h> 39 : 40 : namespace std _GLIBCXX_VISIBILITY(default) 41 : { 42 : _GLIBCXX_BEGIN_NAMESPACE_VERSION 43 : namespace __detail 44 : { 45 : #if __cpp_variable_templates 46 : // This accepts 128-bit integers even in strict mode. 47 : template<typename _Tp> 48 : constexpr bool __integer_to_chars_is_unsigned 49 : = ! __gnu_cxx::__int_traits<_Tp>::__is_signed; 50 : #endif 51 : 52 : // Generic implementation for arbitrary bases. 53 : template<typename _Tp> 54 : _GLIBCXX14_CONSTEXPR unsigned 55 478128 : __to_chars_len(_Tp __value, int __base = 10) noexcept 56 : { 57 : #if __cpp_variable_templates 58 : static_assert(__integer_to_chars_is_unsigned<_Tp>, "implementation bug"); 59 : #endif 60 : 61 478128 : unsigned __n = 1; 62 478128 : const unsigned __b2 = __base * __base; 63 478128 : const unsigned __b3 = __b2 * __base; 64 478128 : const unsigned long __b4 = __b3 * __base; 65 : for (;;) 66 : { 67 478128 : if (__value < (unsigned)__base) return __n; 68 1178 : if (__value < __b2) return __n + 1; 69 10 : if (__value < __b3) return __n + 2; 70 0 : if (__value < __b4) return __n + 3; 71 0 : __value /= __b4; 72 0 : __n += 4; 73 : } 74 : } 75 : 76 : // Write an unsigned integer value to the range [first,first+len). 77 : // The caller is required to provide a buffer of exactly the right size 78 : // (which can be determined by the __to_chars_len function). 79 : template<typename _Tp> 80 : _GLIBCXX23_CONSTEXPR void 81 478128 : __to_chars_10_impl(char* __first, unsigned __len, _Tp __val) noexcept 82 : { 83 : #if __cpp_variable_templates 84 : static_assert(__integer_to_chars_is_unsigned<_Tp>, "implementation bug"); 85 : #endif 86 : 87 478128 : constexpr char __digits[201] = 88 : "0001020304050607080910111213141516171819" 89 : "2021222324252627282930313233343536373839" 90 : "4041424344454647484950515253545556575859" 91 : "6061626364656667686970717273747576777879" 92 : "8081828384858687888990919293949596979899"; 93 478128 : unsigned __pos = __len - 1; 94 478138 : while (__val >= 100) 95 : { 96 10 : auto const __num = (__val % 100) * 2; 97 10 : __val /= 100; 98 10 : __first[__pos] = __digits[__num + 1]; 99 10 : __first[__pos - 1] = __digits[__num]; 100 10 : __pos -= 2; 101 : } 102 478128 : if (__val >= 10) 103 : { 104 1168 : auto const __num = __val * 2; 105 1168 : __first[1] = __digits[__num + 1]; 106 1168 : __first[0] = __digits[__num]; 107 : } 108 : else 109 476960 : __first[0] = '0' + __val; 110 478128 : } 111 : 112 : } // namespace __detail 113 : _GLIBCXX_END_NAMESPACE_VERSION 114 : } // namespace std 115 : #endif // C++11 116 : #endif // _GLIBCXX_CHARCONV_H |
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| Generated by: LCOV version 2.0-1 |
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