c54c1b2b52
2005-10-05 Paolo Carlini <pcarlini@suse.de> * include/ext/sso_string_base.h (struct __sso_string_local): Remove, actually POD types cannot have user defined constructors (being aggregates) and therefore can always be members of unions. (class __sso_string_base): Adjust consistently. From-SVN: r105021
553 lines
16 KiB
C++
553 lines
16 KiB
C++
// Short-string-optimized versatile string base -*- C++ -*-
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// Copyright (C) 2005 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 2, 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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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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/** @file ext/sso_string_base.h
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* This file is a GNU extension to the Standard C++ Library.
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* This is an internal header file, included by other library headers.
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* You should not attempt to use it directly.
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*/
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#ifndef _SSO_STRING_BASE_H
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#define _SSO_STRING_BASE_H 1
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namespace __gnu_cxx
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{
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template<typename _CharT, typename _Traits, typename _Alloc>
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class __sso_string_base
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: protected __vstring_utility<_CharT, _Traits, _Alloc>
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{
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public:
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typedef _Traits traits_type;
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typedef typename _Traits::char_type value_type;
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typedef _Alloc allocator_type;
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typedef typename __vstring_utility<_CharT, _Traits, _Alloc>::
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_CharT_alloc_type _CharT_alloc_type;
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typedef typename _CharT_alloc_type::size_type size_type;
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// The maximum number of individual char_type elements of an
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// individual string is determined by _S_max_size. This is the
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// value that will be returned by max_size(). (Whereas npos
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// is the maximum number of bytes the allocator can allocate.)
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// If one was to divvy up the theoretical largest size string,
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// with a terminating character and m _CharT elements, it'd
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// look like this:
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// npos = m * sizeof(_CharT) + sizeof(_CharT)
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// Solving for m:
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// m = npos / sizeof(CharT) - 1
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// In addition, this implementation quarters this amount.
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static const size_type _S_max_size;
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private:
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static const _CharT _S_terminal;
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// Use empty-base optimization: http://www.cantrip.org/emptyopt.html
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struct _Alloc_hider : _Alloc
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{
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_Alloc_hider(const _Alloc& __a, _CharT* __ptr)
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: _Alloc(__a), _M_p(__ptr) { }
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_CharT* _M_p; // The actual data.
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};
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// Data Members (private):
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_Alloc_hider _M_dataplus;
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size_type _M_string_length;
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enum { _S_local_capacity = 15 };
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union
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{
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_CharT _M_local_data[_S_local_capacity + 1];
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size_type _M_allocated_capacity;
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};
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_CharT*
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_M_data(_CharT* __p)
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{ return (_M_dataplus._M_p = __p); }
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void
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_M_length(size_type __length)
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{ _M_string_length = __length; }
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void
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_M_capacity(size_type __capacity)
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{ _M_allocated_capacity = __capacity; }
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bool
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_M_is_local() const
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{ return _M_data() == _M_local_data; }
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// Create & Destroy
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_CharT*
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_M_create(size_type&, size_type);
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void
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_M_dispose() throw()
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{
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if (!_M_is_local())
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_M_destroy(_M_allocated_capacity + 1);
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}
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void
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_M_destroy(size_type) throw();
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// _M_construct_aux is used to implement the 21.3.1 para 15 which
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// requires special behaviour if _InIter is an integral type
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template<class _InIterator>
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void
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_M_construct_aux(_InIterator __beg, _InIterator __end, __false_type)
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{
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typedef typename iterator_traits<_InIterator>::iterator_category _Tag;
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_M_construct(__beg, __end, _Tag());
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}
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template<class _InIterator>
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void
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_M_construct_aux(_InIterator __beg, _InIterator __end, __true_type)
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{ _M_construct(static_cast<size_type>(__beg),
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static_cast<value_type>(__end)); }
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template<class _InIterator>
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void
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_M_construct(_InIterator __beg, _InIterator __end)
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{
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typedef typename std::__is_integer<_InIterator>::__type _Integral;
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_M_construct_aux(__beg, __end, _Integral());
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}
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// For Input Iterators, used in istreambuf_iterators, etc.
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template<class _InIterator>
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void
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_M_construct(_InIterator __beg, _InIterator __end,
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std::input_iterator_tag);
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// For forward_iterators up to random_access_iterators, used for
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// string::iterator, _CharT*, etc.
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template<class _FwdIterator>
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void
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_M_construct(_FwdIterator __beg, _FwdIterator __end,
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std::forward_iterator_tag);
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void
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_M_construct(size_type __req, _CharT __c);
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public:
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_CharT*
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_M_data() const
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{ return _M_dataplus._M_p; }
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size_type
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_M_length() const
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{ return _M_string_length; }
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size_type
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_M_capacity() const
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{
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return _M_is_local() ? size_type(_S_local_capacity)
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: _M_allocated_capacity;
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}
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bool
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_M_is_shared() const
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{ return false; }
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bool
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_M_is_leaked() const
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{ return false; }
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void
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_M_set_sharable() { }
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void
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_M_set_leaked() { }
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void
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_M_set_length(size_type __n)
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{
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_M_length(__n);
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// grrr. (per 21.3.4)
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// You cannot leave those LWG people alone for a second.
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traits_type::assign(_M_data()[__n], _S_terminal);
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}
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void
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_M_leak() { }
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__sso_string_base()
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: _M_dataplus(_Alloc(), _M_local_data)
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{ _M_set_length(0); }
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__sso_string_base(const _Alloc& __a);
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__sso_string_base(const __sso_string_base& __rcs);
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__sso_string_base(size_type __n, _CharT __c, const _Alloc& __a);
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template<typename _InputIterator>
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__sso_string_base(_InputIterator __beg, _InputIterator __end,
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const _Alloc& __a);
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~__sso_string_base()
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{ _M_dispose(); }
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allocator_type
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_M_get_allocator() const
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{ return _M_dataplus; }
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void
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_M_swap(__sso_string_base& __rcs);
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void
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_M_assign(const __sso_string_base& __rcs);
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void
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_M_reserve(size_type __res);
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void
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_M_mutate(size_type __pos, size_type __len1, size_type __len2);
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};
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template<typename _CharT, typename _Traits, typename _Alloc>
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void
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__sso_string_base<_CharT, _Traits, _Alloc>::
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_M_destroy(size_type __size) throw()
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{ _CharT_alloc_type(_M_get_allocator()).deallocate(_M_data(), __size); }
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template<typename _CharT, typename _Traits, typename _Alloc>
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void
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__sso_string_base<_CharT, _Traits, _Alloc>::
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_M_swap(__sso_string_base& __rcs)
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{
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const bool __local = _M_is_local();
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const bool __rcs_local = __rcs._M_is_local();
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if (__local && __rcs_local)
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{
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_CharT __tmp_data[_S_local_capacity + 1];
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const size_type __tmp_length = __rcs._M_length();
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_S_copy(__tmp_data, __rcs._M_data(), __rcs._M_length() + 1);
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__rcs._M_length(_M_length());
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_S_copy(__rcs._M_data(), _M_data(), _M_length() + 1);
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_M_length(__tmp_length);
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_S_copy(_M_data(), __tmp_data, __tmp_length + 1);
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}
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else if (__local && !__rcs_local)
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{
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const size_type __tmp_capacity = __rcs._M_allocated_capacity;
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const size_type __tmp_length = __rcs._M_length();
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_CharT* __tmp_ptr = __rcs._M_data();
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__rcs._M_data(__rcs._M_local_data);
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_S_copy(__rcs._M_data(), _M_data(), _M_length() + 1);
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__rcs._M_length(_M_length());
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_M_data(__tmp_ptr);
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_M_length(__tmp_length);
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_M_capacity(__tmp_capacity);
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}
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else if (!__local && __rcs_local)
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{
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const size_type __tmp_capacity = _M_allocated_capacity;
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const size_type __tmp_length = _M_length();
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_CharT* __tmp_ptr = _M_data();
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_M_data(_M_local_data);
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_S_copy(_M_data(), __rcs._M_data(), __rcs._M_length() + 1);
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_M_length(__rcs._M_length());
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__rcs._M_data(__tmp_ptr);
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__rcs._M_length(__tmp_length);
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__rcs._M_capacity(__tmp_capacity);
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}
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else
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{
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const size_type __tmp_capacity = _M_allocated_capacity;
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const size_type __tmp_length = _M_length();
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_CharT* __tmp_ptr = _M_data();
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_M_data(__rcs._M_data());
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_M_length(__rcs._M_length());
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_M_capacity(__rcs._M_allocated_capacity);
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__rcs._M_data(__tmp_ptr);
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__rcs._M_length(__tmp_length);
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__rcs._M_capacity(__tmp_capacity);
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}
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}
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template<typename _CharT, typename _Traits, typename _Alloc>
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const typename __sso_string_base<_CharT, _Traits, _Alloc>::size_type
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__sso_string_base<_CharT, _Traits, _Alloc>::
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_S_max_size = ((static_cast<size_type>(-1) / sizeof(_CharT)) - 1) / 4;
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template<typename _CharT, typename _Traits, typename _Alloc>
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const _CharT
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__sso_string_base<_CharT, _Traits, _Alloc>::_S_terminal = _CharT();
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template<typename _CharT, typename _Traits, typename _Alloc>
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_CharT*
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__sso_string_base<_CharT, _Traits, _Alloc>::
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_M_create(size_type& __capacity, size_type __old_capacity)
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{
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 83. String::npos vs. string::max_size()
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if (__capacity > _S_max_size)
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std::__throw_length_error(__N("__sso_string_base::_M_create"));
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// The below implements an exponential growth policy, necessary to
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// meet amortized linear time requirements of the library: see
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// http://gcc.gnu.org/ml/libstdc++/2001-07/msg00085.html.
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// It's active for allocations requiring an amount of memory above
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// system pagesize. This is consistent with the requirements of the
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// standard: http://gcc.gnu.org/ml/libstdc++/2001-07/msg00130.html
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if (__capacity > __old_capacity && __capacity < 2 * __old_capacity)
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__capacity = 2 * __old_capacity;
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// NB: Need an array of char_type[__capacity], plus a terminating
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// null char_type() element.
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return _CharT_alloc_type(_M_get_allocator()).allocate(__capacity + 1);
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}
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template<typename _CharT, typename _Traits, typename _Alloc>
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__sso_string_base<_CharT, _Traits, _Alloc>::
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__sso_string_base(const _Alloc& __a)
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: _M_dataplus(__a, _M_local_data)
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{ _M_set_length(0); }
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template<typename _CharT, typename _Traits, typename _Alloc>
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__sso_string_base<_CharT, _Traits, _Alloc>::
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__sso_string_base(const __sso_string_base& __rcs)
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: _M_dataplus(__rcs._M_get_allocator(), _M_local_data)
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{ _M_construct(__rcs._M_data(), __rcs._M_data() + __rcs._M_length()); }
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template<typename _CharT, typename _Traits, typename _Alloc>
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__sso_string_base<_CharT, _Traits, _Alloc>::
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__sso_string_base(size_type __n, _CharT __c, const _Alloc& __a)
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: _M_dataplus(__a, _M_local_data)
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{ _M_construct(__n, __c); }
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template<typename _CharT, typename _Traits, typename _Alloc>
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template<typename _InputIterator>
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__sso_string_base<_CharT, _Traits, _Alloc>::
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__sso_string_base(_InputIterator __beg, _InputIterator __end,
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const _Alloc& __a)
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: _M_dataplus(__a, _M_local_data)
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{ _M_construct(__beg, __end); }
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// NB: This is the special case for Input Iterators, used in
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// istreambuf_iterators, etc.
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// Input Iterators have a cost structure very different from
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// pointers, calling for a different coding style.
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template<typename _CharT, typename _Traits, typename _Alloc>
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template<typename _InIterator>
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void
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__sso_string_base<_CharT, _Traits, _Alloc>::
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_M_construct(_InIterator __beg, _InIterator __end,
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std::input_iterator_tag)
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{
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// Avoid reallocation for common case.
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size_type __len = 0;
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size_type __capacity = size_type(_S_local_capacity);
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while (__beg != __end && __len < __capacity)
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{
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_M_data()[__len++] = *__beg;
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++__beg;
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}
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try
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{
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while (__beg != __end)
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{
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if (__len == __capacity)
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{
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// Allocate more space.
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__capacity = __len + 1;
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_CharT* __another = _M_create(__capacity, __len);
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_S_copy(__another, _M_data(), __len);
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_M_dispose();
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_M_data(__another);
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_M_capacity(__capacity);
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}
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_M_data()[__len++] = *__beg;
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++__beg;
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}
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}
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catch(...)
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{
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_M_dispose();
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__throw_exception_again;
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}
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_M_set_length(__len);
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}
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template<typename _CharT, typename _Traits, typename _Alloc>
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template <typename _InIterator>
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void
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__sso_string_base<_CharT, _Traits, _Alloc>::
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_M_construct(_InIterator __beg, _InIterator __end,
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std::forward_iterator_tag)
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{
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// NB: Not required, but considered best practice.
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if (__builtin_expect(__is_null_p(__beg) && __beg != __end, 0))
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std::__throw_logic_error(__N("__sso_string_base::"
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"_M_construct NULL not valid"));
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size_type __dnew = static_cast<size_type>(std::distance(__beg, __end));
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if (__dnew > size_type(_S_local_capacity))
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{
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_M_data(_M_create(__dnew, size_type(0)));
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_M_capacity(__dnew);
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}
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// Check for out_of_range and length_error exceptions.
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try
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{ _S_copy_chars(_M_data(), __beg, __end); }
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catch(...)
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{
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_M_dispose();
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__throw_exception_again;
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}
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_M_set_length(__dnew);
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}
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template<typename _CharT, typename _Traits, typename _Alloc>
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void
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__sso_string_base<_CharT, _Traits, _Alloc>::
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_M_construct(size_type __n, _CharT __c)
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{
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if (__n > size_type(_S_local_capacity))
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{
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_M_data(_M_create(__n, size_type(0)));
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_M_capacity(__n);
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}
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if (__n)
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_S_assign(_M_data(), __n, __c);
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_M_set_length(__n);
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}
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template<typename _CharT, typename _Traits, typename _Alloc>
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void
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__sso_string_base<_CharT, _Traits, _Alloc>::
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_M_assign(const __sso_string_base& __rcs)
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{
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if (this != &__rcs)
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{
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size_type __size = __rcs._M_length();
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_CharT* __tmp = _M_local_data;
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if (__size > size_type(_S_local_capacity))
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__tmp = _M_create(__size, size_type(0));
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_M_dispose();
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_M_data(__tmp);
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if (__size)
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_S_copy(_M_data(), __rcs._M_data(), __size);
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if (!_M_is_local())
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_M_capacity(__size);
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_M_set_length(__size);
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}
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}
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template<typename _CharT, typename _Traits, typename _Alloc>
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void
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__sso_string_base<_CharT, _Traits, _Alloc>::
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_M_reserve(size_type __res)
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{
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const size_type __capacity = _M_capacity();
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if (__res != __capacity)
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{
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// Make sure we don't shrink below the current size.
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if (__res < _M_length())
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__res = _M_length();
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|
|
|
if (__res > __capacity
|
|
|| __res > size_type(_S_local_capacity))
|
|
{
|
|
_CharT* __tmp = _M_create(__res, __capacity);
|
|
if (_M_length())
|
|
_S_copy(__tmp, _M_data(), _M_length());
|
|
_M_dispose();
|
|
_M_data(__tmp);
|
|
_M_capacity(__res);
|
|
}
|
|
else if (!_M_is_local())
|
|
{
|
|
const size_type __tmp_capacity = _M_allocated_capacity;
|
|
if (_M_length())
|
|
_S_copy(_M_local_data, _M_data(), _M_length());
|
|
_M_destroy(__tmp_capacity + 1);
|
|
_M_data(_M_local_data);
|
|
}
|
|
|
|
_M_set_length(_M_length());
|
|
}
|
|
}
|
|
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
|
void
|
|
__sso_string_base<_CharT, _Traits, _Alloc>::
|
|
_M_mutate(size_type __pos, size_type __len1, size_type __len2)
|
|
{
|
|
const size_type __old_size = _M_length();
|
|
const size_type __new_size = __old_size + __len2 - __len1;
|
|
const size_type __how_much = __old_size - __pos - __len1;
|
|
|
|
if (__new_size > _M_capacity())
|
|
{
|
|
// Must reallocate.
|
|
size_type __new_capacity = __new_size;
|
|
_CharT* __r = _M_create(__new_capacity, _M_capacity());
|
|
|
|
if (__pos)
|
|
_S_copy(__r, _M_data(), __pos);
|
|
if (__how_much)
|
|
_S_copy(__r + __pos + __len2,
|
|
_M_data() + __pos + __len1, __how_much);
|
|
|
|
_M_dispose();
|
|
_M_data(__r);
|
|
_M_capacity(__new_capacity);
|
|
}
|
|
else if (__how_much && __len1 != __len2)
|
|
{
|
|
// Work in-place.
|
|
_S_move(_M_data() + __pos + __len2,
|
|
_M_data() + __pos + __len1, __how_much);
|
|
}
|
|
|
|
_M_set_length(__new_size);
|
|
}
|
|
} // namespace __gnu_cxx
|
|
|
|
#endif /* _SSO_STRING_BASE_H */
|