577 lines
16 KiB
C++
577 lines
16 KiB
C++
// Short-string-optimized versatile string base -*- C++ -*-
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// Copyright (C) 2005-2017 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 ext/sso_string_base.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{ext/vstring.h}
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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 _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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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 __vstring_utility<_CharT, _Traits, _Alloc> _Util_Base;
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typedef typename _Util_Base::_CharT_alloc_type _CharT_alloc_type;
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typedef typename _CharT_alloc_type::size_type size_type;
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private:
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// Data Members:
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typename _Util_Base::template _Alloc_hider<_CharT_alloc_type>
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_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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void
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_M_data(_CharT* __p)
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{ _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()
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{
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if (!_M_is_local())
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_M_destroy(_M_allocated_capacity);
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}
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void
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_M_destroy(size_type __size) throw()
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{ _M_get_allocator().deallocate(_M_data(), __size + 1); }
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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 _InIterator is an integral type
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template<typename _InIterator>
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void
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_M_construct_aux(_InIterator __beg, _InIterator __end,
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std::__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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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 438. Ambiguity in the "do the right thing" clause
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template<typename _Integer>
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void
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_M_construct_aux(_Integer __beg, _Integer __end, std::__true_type)
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{ _M_construct_aux_2(static_cast<size_type>(__beg), __end); }
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void
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_M_construct_aux_2(size_type __req, _CharT __c)
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{ _M_construct(__req, __c); }
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template<typename _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<typename _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<typename _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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size_type
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_M_max_size() const
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{ return (_M_get_allocator().max_size() - 1) / 2; }
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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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void
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_M_set_leaked() { }
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void
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_M_leak() { }
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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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traits_type::assign(_M_data()[__n], _CharT());
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}
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__sso_string_base()
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: _M_dataplus(_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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#if __cplusplus >= 201103L
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__sso_string_base(__sso_string_base&& __rcs);
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#endif
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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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_CharT_alloc_type&
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_M_get_allocator()
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{ return _M_dataplus; }
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const _CharT_alloc_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, const _CharT* __s,
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size_type __len2);
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void
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_M_erase(size_type __pos, size_type __n);
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void
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_M_clear()
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{ _M_set_length(0); }
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bool
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_M_compare(const __sso_string_base&) const
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{ return false; }
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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_swap(__sso_string_base& __rcs)
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{
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if (this == &__rcs)
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return;
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 431. Swapping containers with unequal allocators.
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std::__alloc_swap<_CharT_alloc_type>::_S_do_it(_M_get_allocator(),
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__rcs._M_get_allocator());
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if (_M_is_local())
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if (__rcs._M_is_local())
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{
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if (_M_length() && __rcs._M_length())
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{
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_CharT __tmp_data[_S_local_capacity + 1];
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traits_type::copy(__tmp_data, __rcs._M_local_data,
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_S_local_capacity + 1);
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traits_type::copy(__rcs._M_local_data, _M_local_data,
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_S_local_capacity + 1);
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traits_type::copy(_M_local_data, __tmp_data,
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_S_local_capacity + 1);
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}
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else if (__rcs._M_length())
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{
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traits_type::copy(_M_local_data, __rcs._M_local_data,
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_S_local_capacity + 1);
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_M_length(__rcs._M_length());
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__rcs._M_set_length(0);
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return;
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}
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else if (_M_length())
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{
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traits_type::copy(__rcs._M_local_data, _M_local_data,
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_S_local_capacity + 1);
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__rcs._M_length(_M_length());
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_M_set_length(0);
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return;
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}
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}
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else
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{
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const size_type __tmp_capacity = __rcs._M_allocated_capacity;
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traits_type::copy(__rcs._M_local_data, _M_local_data,
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_S_local_capacity + 1);
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_M_data(__rcs._M_data());
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__rcs._M_data(__rcs._M_local_data);
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_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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if (__rcs._M_is_local())
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{
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traits_type::copy(_M_local_data, __rcs._M_local_data,
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_S_local_capacity + 1);
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__rcs._M_data(_M_data());
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_M_data(_M_local_data);
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}
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else
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{
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_CharT* __tmp_ptr = _M_data();
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_M_data(__rcs._M_data());
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__rcs._M_data(__tmp_ptr);
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_M_capacity(__rcs._M_allocated_capacity);
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}
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__rcs._M_capacity(__tmp_capacity);
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}
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const size_type __tmp_length = _M_length();
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_M_length(__rcs._M_length());
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__rcs._M_length(__tmp_length);
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}
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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 > _M_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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if (__capacity > __old_capacity && __capacity < 2 * __old_capacity)
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{
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__capacity = 2 * __old_capacity;
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// Never allocate a string bigger than max_size.
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if (__capacity > _M_max_size())
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__capacity = _M_max_size();
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}
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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 _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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#if __cplusplus >= 201103L
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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(__sso_string_base&& __rcs)
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: _M_dataplus(__rcs._M_get_allocator(), _M_local_data)
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{
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if (__rcs._M_is_local())
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{
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if (__rcs._M_length())
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traits_type::copy(_M_local_data, __rcs._M_local_data,
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_S_local_capacity + 1);
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}
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else
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{
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_M_data(__rcs._M_data());
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_M_capacity(__rcs._M_allocated_capacity);
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}
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_M_set_length(__rcs._M_length());
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__rcs._M_data(__rcs._M_local_data);
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__rcs._M_set_length(0);
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}
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#endif
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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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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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this->_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 (__is_null_pointer(__beg) && __beg != __end)
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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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{ this->_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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this->_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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const size_type __rsize = __rcs._M_length();
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const size_type __capacity = _M_capacity();
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if (__rsize > __capacity)
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{
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size_type __new_capacity = __rsize;
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_CharT* __tmp = _M_create(__new_capacity, __capacity);
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_M_dispose();
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_M_data(__tmp);
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_M_capacity(__new_capacity);
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}
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if (__rsize)
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this->_S_copy(_M_data(), __rcs._M_data(), __rsize);
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_M_set_length(__rsize);
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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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// 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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const size_type __capacity = _M_capacity();
|
|
if (__res != __capacity)
|
|
{
|
|
if (__res > __capacity
|
|
|| __res > size_type(_S_local_capacity))
|
|
{
|
|
_CharT* __tmp = _M_create(__res, __capacity);
|
|
this->_S_copy(__tmp, _M_data(), _M_length() + 1);
|
|
_M_dispose();
|
|
_M_data(__tmp);
|
|
_M_capacity(__res);
|
|
}
|
|
else if (!_M_is_local())
|
|
{
|
|
this->_S_copy(_M_local_data, _M_data(), _M_length() + 1);
|
|
_M_destroy(__capacity);
|
|
_M_data(_M_local_data);
|
|
}
|
|
}
|
|
}
|
|
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
|
void
|
|
__sso_string_base<_CharT, _Traits, _Alloc>::
|
|
_M_mutate(size_type __pos, size_type __len1, const _CharT* __s,
|
|
size_type __len2)
|
|
{
|
|
const size_type __how_much = _M_length() - __pos - __len1;
|
|
|
|
size_type __new_capacity = _M_length() + __len2 - __len1;
|
|
_CharT* __r = _M_create(__new_capacity, _M_capacity());
|
|
|
|
if (__pos)
|
|
this->_S_copy(__r, _M_data(), __pos);
|
|
if (__s && __len2)
|
|
this->_S_copy(__r + __pos, __s, __len2);
|
|
if (__how_much)
|
|
this->_S_copy(__r + __pos + __len2,
|
|
_M_data() + __pos + __len1, __how_much);
|
|
|
|
_M_dispose();
|
|
_M_data(__r);
|
|
_M_capacity(__new_capacity);
|
|
}
|
|
|
|
template<typename _CharT, typename _Traits, typename _Alloc>
|
|
void
|
|
__sso_string_base<_CharT, _Traits, _Alloc>::
|
|
_M_erase(size_type __pos, size_type __n)
|
|
{
|
|
const size_type __how_much = _M_length() - __pos - __n;
|
|
|
|
if (__how_much && __n)
|
|
this->_S_move(_M_data() + __pos, _M_data() + __pos + __n, __how_much);
|
|
|
|
_M_set_length(_M_length() - __n);
|
|
}
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace
|
|
|
|
#endif /* _SSO_STRING_BASE_H */
|