| // Versatile string utility -*- C++ -*- |
| |
| // Copyright (C) 2005-2022 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // Under Section 7 of GPL version 3, you are granted additional |
| // permissions described in the GCC Runtime Library Exception, version |
| // 3.1, as published by the Free Software Foundation. |
| |
| // You should have received a copy of the GNU General Public License and |
| // a copy of the GCC Runtime Library Exception along with this program; |
| // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| // <http://www.gnu.org/licenses/>. |
| |
| /** @file ext/vstring_util.h |
| * This is an internal header file, included by other library headers. |
| * Do not attempt to use it directly. @headername{ext/vstring.h} |
| */ |
| |
| #ifndef _VSTRING_UTIL_H |
| #define _VSTRING_UTIL_H 1 |
| |
| #pragma GCC system_header |
| |
| #include <bits/requires_hosted.h> // GNU extensions are currently omitted |
| |
| #include <ext/vstring_fwd.h> |
| #include <debug/debug.h> |
| #include <bits/stl_function.h> // For less |
| #include <bits/functexcept.h> |
| #include <bits/localefwd.h> |
| #include <bits/ostream_insert.h> |
| #include <bits/stl_iterator.h> |
| #include <ext/numeric_traits.h> |
| #include <ext/alloc_traits.h> |
| #include <bits/move.h> |
| #include <bits/range_access.h> |
| |
| namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) |
| { |
| _GLIBCXX_BEGIN_NAMESPACE_VERSION |
| |
| template<typename _CharT, typename _Traits, typename _Alloc> |
| struct __vstring_utility |
| { |
| typedef typename __alloc_traits<_Alloc>::template rebind<_CharT>::other |
| _CharT_alloc_type; |
| typedef __alloc_traits<_CharT_alloc_type> _CharT_alloc_traits; |
| |
| typedef _Traits traits_type; |
| typedef typename _Traits::char_type value_type; |
| typedef typename _CharT_alloc_type::size_type size_type; |
| typedef typename _CharT_alloc_type::difference_type difference_type; |
| typedef typename _CharT_alloc_traits::pointer pointer; |
| typedef typename _CharT_alloc_traits::const_pointer const_pointer; |
| |
| // For __sso_string. |
| typedef __gnu_cxx:: |
| __normal_iterator<pointer, __gnu_cxx:: |
| __versa_string<_CharT, _Traits, _Alloc, |
| __sso_string_base> > |
| __sso_iterator; |
| typedef __gnu_cxx:: |
| __normal_iterator<const_pointer, __gnu_cxx:: |
| __versa_string<_CharT, _Traits, _Alloc, |
| __sso_string_base> > |
| __const_sso_iterator; |
| |
| // For __rc_string. |
| typedef __gnu_cxx:: |
| __normal_iterator<pointer, __gnu_cxx:: |
| __versa_string<_CharT, _Traits, _Alloc, |
| __rc_string_base> > |
| __rc_iterator; |
| typedef __gnu_cxx:: |
| __normal_iterator<const_pointer, __gnu_cxx:: |
| __versa_string<_CharT, _Traits, _Alloc, |
| __rc_string_base> > |
| __const_rc_iterator; |
| |
| // NB: When the allocator is empty, deriving from it saves space |
| // (http://www.cantrip.org/emptyopt.html). |
| template<typename _Alloc1> |
| struct _Alloc_hider |
| : public _Alloc1 |
| { |
| _Alloc_hider(_CharT* __ptr) |
| : _Alloc1(), _M_p(__ptr) { } |
| |
| _Alloc_hider(const _Alloc1& __a, _CharT* __ptr) |
| : _Alloc1(__a), _M_p(__ptr) { } |
| |
| _CharT* _M_p; // The actual data. |
| }; |
| |
| // When __n = 1 way faster than the general multichar |
| // traits_type::copy/move/assign. |
| static void |
| _S_copy(_CharT* __d, const _CharT* __s, size_type __n) |
| { |
| if (__n == 1) |
| traits_type::assign(*__d, *__s); |
| else |
| traits_type::copy(__d, __s, __n); |
| } |
| |
| static void |
| _S_move(_CharT* __d, const _CharT* __s, size_type __n) |
| { |
| if (__n == 1) |
| traits_type::assign(*__d, *__s); |
| else |
| traits_type::move(__d, __s, __n); |
| } |
| |
| static void |
| _S_assign(_CharT* __d, size_type __n, _CharT __c) |
| { |
| if (__n == 1) |
| traits_type::assign(*__d, __c); |
| else |
| traits_type::assign(__d, __n, __c); |
| } |
| |
| // _S_copy_chars is a separate template to permit specialization |
| // to optimize for the common case of pointers as iterators. |
| template<typename _Iterator> |
| static void |
| _S_copy_chars(_CharT* __p, _Iterator __k1, _Iterator __k2) |
| { |
| for (; __k1 != __k2; ++__k1, ++__p) |
| traits_type::assign(*__p, *__k1); // These types are off. |
| } |
| |
| static void |
| _S_copy_chars(_CharT* __p, __sso_iterator __k1, __sso_iterator __k2) |
| { _S_copy_chars(__p, __k1.base(), __k2.base()); } |
| |
| static void |
| _S_copy_chars(_CharT* __p, __const_sso_iterator __k1, |
| __const_sso_iterator __k2) |
| { _S_copy_chars(__p, __k1.base(), __k2.base()); } |
| |
| static void |
| _S_copy_chars(_CharT* __p, __rc_iterator __k1, __rc_iterator __k2) |
| { _S_copy_chars(__p, __k1.base(), __k2.base()); } |
| |
| static void |
| _S_copy_chars(_CharT* __p, __const_rc_iterator __k1, |
| __const_rc_iterator __k2) |
| { _S_copy_chars(__p, __k1.base(), __k2.base()); } |
| |
| static void |
| _S_copy_chars(_CharT* __p, _CharT* __k1, _CharT* __k2) |
| { _S_copy(__p, __k1, __k2 - __k1); } |
| |
| static void |
| _S_copy_chars(_CharT* __p, const _CharT* __k1, const _CharT* __k2) |
| { _S_copy(__p, __k1, __k2 - __k1); } |
| |
| static int |
| _S_compare(size_type __n1, size_type __n2) |
| { |
| const difference_type __d = difference_type(__n1 - __n2); |
| |
| if (__d > __numeric_traits_integer<int>::__max) |
| return __numeric_traits_integer<int>::__max; |
| else if (__d < __numeric_traits_integer<int>::__min) |
| return __numeric_traits_integer<int>::__min; |
| else |
| return int(__d); |
| } |
| }; |
| |
| _GLIBCXX_END_NAMESPACE_VERSION |
| } // namespace |
| |
| #endif /* _VSTRING_UTIL_H */ |