1 // Versatile string utility -*- C++ -*- 2 3 // Copyright (C) 2005-2018 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 ext/vstring_util.h 26 * This is an internal header file, included by other library headers. 27 * Do not attempt to use it directly. @headername{ext/vstring.h} 28 */ 29 30 #ifndef _VSTRING_UTIL_H 31 #define _VSTRING_UTIL_H 1 32 33 #pragma GCC system_header 34 35 #include <ext/vstring_fwd.h> 36 #include <debug/debug.h> 37 #include <bits/stl_function.h> // For less 38 #include <bits/functexcept.h> 39 #include <bits/localefwd.h> 40 #include <bits/ostream_insert.h> 41 #include <bits/stl_iterator.h> 42 #include <ext/numeric_traits.h> 43 #include <bits/move.h> 44 #include <bits/range_access.h> 45 46 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) 47 { 48 _GLIBCXX_BEGIN_NAMESPACE_VERSION 49 50 template<typename _CharT, typename _Traits, typename _Alloc> 51 struct __vstring_utility 52 { 53 typedef typename _Alloc::template rebind<_CharT>::other _CharT_alloc_type; 54 55 typedef _Traits traits_type; 56 typedef typename _Traits::char_type value_type; 57 typedef typename _CharT_alloc_type::size_type size_type; 58 typedef typename _CharT_alloc_type::difference_type difference_type; 59 typedef typename _CharT_alloc_type::pointer pointer; 60 typedef typename _CharT_alloc_type::const_pointer const_pointer; 61 62 // For __sso_string. 63 typedef __gnu_cxx:: 64 __normal_iterator<pointer, __gnu_cxx:: 65 __versa_string<_CharT, _Traits, _Alloc, 66 __sso_string_base> > 67 __sso_iterator; 68 typedef __gnu_cxx:: 69 __normal_iterator<const_pointer, __gnu_cxx:: 70 __versa_string<_CharT, _Traits, _Alloc, 71 __sso_string_base> > 72 __const_sso_iterator; 73 74 // For __rc_string. 75 typedef __gnu_cxx:: 76 __normal_iterator<pointer, __gnu_cxx:: 77 __versa_string<_CharT, _Traits, _Alloc, 78 __rc_string_base> > 79 __rc_iterator; 80 typedef __gnu_cxx:: 81 __normal_iterator<const_pointer, __gnu_cxx:: 82 __versa_string<_CharT, _Traits, _Alloc, 83 __rc_string_base> > 84 __const_rc_iterator; 85 86 // NB: When the allocator is empty, deriving from it saves space 87 // (http://www.cantrip.org/emptyopt.html). 88 template<typename _Alloc1> 89 struct _Alloc_hider 90 : public _Alloc1 91 { 92 _Alloc_hider(_CharT* __ptr) 93 : _Alloc1(), _M_p(__ptr) { } 94 95 _Alloc_hider(const _Alloc1& __a, _CharT* __ptr) 96 : _Alloc1(__a), _M_p(__ptr) { } 97 98 _CharT* _M_p; // The actual data. 99 }; 100 101 // When __n = 1 way faster than the general multichar 102 // traits_type::copy/move/assign. 103 static void 104 _S_copy(_CharT* __d, const _CharT* __s, size_type __n) 105 { 106 if (__n == 1) 107 traits_type::assign(*__d, *__s); 108 else 109 traits_type::copy(__d, __s, __n); 110 } 111 112 static void 113 _S_move(_CharT* __d, const _CharT* __s, size_type __n) 114 { 115 if (__n == 1) 116 traits_type::assign(*__d, *__s); 117 else 118 traits_type::move(__d, __s, __n); 119 } 120 121 static void 122 _S_assign(_CharT* __d, size_type __n, _CharT __c) 123 { 124 if (__n == 1) 125 traits_type::assign(*__d, __c); 126 else 127 traits_type::assign(__d, __n, __c); 128 } 129 130 // _S_copy_chars is a separate template to permit specialization 131 // to optimize for the common case of pointers as iterators. 132 template<typename _Iterator> 133 static void 134 _S_copy_chars(_CharT* __p, _Iterator __k1, _Iterator __k2) 135 { 136 for (; __k1 != __k2; ++__k1, ++__p) 137 traits_type::assign(*__p, *__k1); // These types are off. 138 } 139 140 static void 141 _S_copy_chars(_CharT* __p, __sso_iterator __k1, __sso_iterator __k2) 142 { _S_copy_chars(__p, __k1.base(), __k2.base()); } 143 144 static void 145 _S_copy_chars(_CharT* __p, __const_sso_iterator __k1, 146 __const_sso_iterator __k2) 147 { _S_copy_chars(__p, __k1.base(), __k2.base()); } 148 149 static void 150 _S_copy_chars(_CharT* __p, __rc_iterator __k1, __rc_iterator __k2) 151 { _S_copy_chars(__p, __k1.base(), __k2.base()); } 152 153 static void 154 _S_copy_chars(_CharT* __p, __const_rc_iterator __k1, 155 __const_rc_iterator __k2) 156 { _S_copy_chars(__p, __k1.base(), __k2.base()); } 157 158 static void 159 _S_copy_chars(_CharT* __p, _CharT* __k1, _CharT* __k2) 160 { _S_copy(__p, __k1, __k2 - __k1); } 161 162 static void 163 _S_copy_chars(_CharT* __p, const _CharT* __k1, const _CharT* __k2) 164 { _S_copy(__p, __k1, __k2 - __k1); } 165 166 static int 167 _S_compare(size_type __n1, size_type __n2) 168 { 169 const difference_type __d = difference_type(__n1 - __n2); 170 171 if (__d > __numeric_traits_integer<int>::__max) 172 return __numeric_traits_integer<int>::__max; 173 else if (__d < __numeric_traits_integer<int>::__min) 174 return __numeric_traits_integer<int>::__min; 175 else 176 return int(__d); 177 } 178 }; 179 180 _GLIBCXX_END_NAMESPACE_VERSION 181 } // namespace 182 183 #endif /* _VSTRING_UTIL_H */ 184