--- /dev/null
+// Short-string-optimized versatile string base -*- C++ -*-
+
+// Copyright (C) 2005, 2006, 2007, 2008, 2009 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/sso_string_base.h
+ * This file is a GNU extension to the Standard C++ Library.
+ * This is an internal header file, included by other library headers.
+ * You should not attempt to use it directly.
+ */
+
+#ifndef _SSO_STRING_BASE_H
+#define _SSO_STRING_BASE_H 1
+
+_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
+
+ template<typename _CharT, typename _Traits, typename _Alloc>
+ class __sso_string_base
+ : protected __vstring_utility<_CharT, _Traits, _Alloc>
+ {
+ public:
+ typedef _Traits traits_type;
+ typedef typename _Traits::char_type value_type;
+
+ typedef __vstring_utility<_CharT, _Traits, _Alloc> _Util_Base;
+ typedef typename _Util_Base::_CharT_alloc_type _CharT_alloc_type;
+ typedef typename _CharT_alloc_type::size_type size_type;
+
+ private:
+ // Data Members:
+ typename _Util_Base::template _Alloc_hider<_CharT_alloc_type>
+ _M_dataplus;
+ size_type _M_string_length;
+
+ enum { _S_local_capacity = 15 };
+
+ union
+ {
+ _CharT _M_local_data[_S_local_capacity + 1];
+ size_type _M_allocated_capacity;
+ };
+
+ void
+ _M_data(_CharT* __p)
+ { _M_dataplus._M_p = __p; }
+
+ void
+ _M_length(size_type __length)
+ { _M_string_length = __length; }
+
+ void
+ _M_capacity(size_type __capacity)
+ { _M_allocated_capacity = __capacity; }
+
+ bool
+ _M_is_local() const
+ { return _M_data() == _M_local_data; }
+
+ // Create & Destroy
+ _CharT*
+ _M_create(size_type&, size_type);
+
+ void
+ _M_dispose()
+ {
+ if (!_M_is_local())
+ _M_destroy(_M_allocated_capacity);
+ }
+
+ void
+ _M_destroy(size_type __size) throw()
+ { _M_get_allocator().deallocate(_M_data(), __size + 1); }
+
+ // _M_construct_aux is used to implement the 21.3.1 para 15 which
+ // requires special behaviour if _InIterator is an integral type
+ template<typename _InIterator>
+ void
+ _M_construct_aux(_InIterator __beg, _InIterator __end,
+ std::__false_type)
+ {
+ typedef typename iterator_traits<_InIterator>::iterator_category _Tag;
+ _M_construct(__beg, __end, _Tag());
+ }
+
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 438. Ambiguity in the "do the right thing" clause
+ template<typename _Integer>
+ void
+ _M_construct_aux(_Integer __beg, _Integer __end, std::__true_type)
+ { _M_construct(static_cast<size_type>(__beg), __end); }
+
+ template<typename _InIterator>
+ void
+ _M_construct(_InIterator __beg, _InIterator __end)
+ {
+ typedef typename std::__is_integer<_InIterator>::__type _Integral;
+ _M_construct_aux(__beg, __end, _Integral());
+ }
+
+ // For Input Iterators, used in istreambuf_iterators, etc.
+ template<typename _InIterator>
+ void
+ _M_construct(_InIterator __beg, _InIterator __end,
+ std::input_iterator_tag);
+
+ // For forward_iterators up to random_access_iterators, used for
+ // string::iterator, _CharT*, etc.
+ template<typename _FwdIterator>
+ void
+ _M_construct(_FwdIterator __beg, _FwdIterator __end,
+ std::forward_iterator_tag);
+
+ void
+ _M_construct(size_type __req, _CharT __c);
+
+ public:
+ size_type
+ _M_max_size() const
+ { return (_M_get_allocator().max_size() - 1) / 2; }
+
+ _CharT*
+ _M_data() const
+ { return _M_dataplus._M_p; }
+
+ size_type
+ _M_length() const
+ { return _M_string_length; }
+
+ size_type
+ _M_capacity() const
+ {
+ return _M_is_local() ? size_type(_S_local_capacity)
+ : _M_allocated_capacity;
+ }
+
+ bool
+ _M_is_shared() const
+ { return false; }
+
+ void
+ _M_set_leaked() { }
+
+ void
+ _M_leak() { }
+
+ void
+ _M_set_length(size_type __n)
+ {
+ _M_length(__n);
+ traits_type::assign(_M_data()[__n], _CharT());
+ }
+
+ __sso_string_base()
+ : _M_dataplus(_M_local_data)
+ { _M_set_length(0); }
+
+ __sso_string_base(const _Alloc& __a);
+
+ __sso_string_base(const __sso_string_base& __rcs);
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ __sso_string_base(__sso_string_base&& __rcs);
+#endif
+
+ __sso_string_base(size_type __n, _CharT __c, const _Alloc& __a);
+
+ template<typename _InputIterator>
+ __sso_string_base(_InputIterator __beg, _InputIterator __end,
+ const _Alloc& __a);
+
+ ~__sso_string_base()
+ { _M_dispose(); }
+
+ _CharT_alloc_type&
+ _M_get_allocator()
+ { return _M_dataplus; }
+
+ const _CharT_alloc_type&
+ _M_get_allocator() const
+ { return _M_dataplus; }
+
+ void
+ _M_swap(__sso_string_base& __rcs);
+
+ void
+ _M_assign(const __sso_string_base& __rcs);
+
+ void
+ _M_reserve(size_type __res);
+
+ void
+ _M_mutate(size_type __pos, size_type __len1, const _CharT* __s,
+ size_type __len2);
+
+ void
+ _M_erase(size_type __pos, size_type __n);
+
+ void
+ _M_clear()
+ { _M_set_length(0); }
+
+ bool
+ _M_compare(const __sso_string_base&) const
+ { return false; }
+ };
+
+ template<typename _CharT, typename _Traits, typename _Alloc>
+ void
+ __sso_string_base<_CharT, _Traits, _Alloc>::
+ _M_swap(__sso_string_base& __rcs)
+ {
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 431. Swapping containers with unequal allocators.
+ std::__alloc_swap<_CharT_alloc_type>::_S_do_it(_M_get_allocator(),
+ __rcs._M_get_allocator());
+
+ if (_M_is_local())
+ if (__rcs._M_is_local())
+ {
+ if (_M_length() && __rcs._M_length())
+ {
+ _CharT __tmp_data[_S_local_capacity + 1];
+ traits_type::copy(__tmp_data, __rcs._M_local_data,
+ _S_local_capacity + 1);
+ traits_type::copy(__rcs._M_local_data, _M_local_data,
+ _S_local_capacity + 1);
+ traits_type::copy(_M_local_data, __tmp_data,
+ _S_local_capacity + 1);
+ }
+ else if (__rcs._M_length())
+ {
+ traits_type::copy(_M_local_data, __rcs._M_local_data,
+ _S_local_capacity + 1);
+ _M_length(__rcs._M_length());
+ __rcs._M_set_length(0);
+ return;
+ }
+ else if (_M_length())
+ {
+ traits_type::copy(__rcs._M_local_data, _M_local_data,
+ _S_local_capacity + 1);
+ __rcs._M_length(_M_length());
+ _M_set_length(0);
+ return;
+ }
+ }
+ else
+ {
+ const size_type __tmp_capacity = __rcs._M_allocated_capacity;
+ traits_type::copy(__rcs._M_local_data, _M_local_data,
+ _S_local_capacity + 1);
+ _M_data(__rcs._M_data());
+ __rcs._M_data(__rcs._M_local_data);
+ _M_capacity(__tmp_capacity);
+ }
+ else
+ {
+ const size_type __tmp_capacity = _M_allocated_capacity;
+ if (__rcs._M_is_local())
+ {
+ traits_type::copy(_M_local_data, __rcs._M_local_data,
+ _S_local_capacity + 1);
+ __rcs._M_data(_M_data());
+ _M_data(_M_local_data);
+ }
+ else
+ {
+ _CharT* __tmp_ptr = _M_data();
+ _M_data(__rcs._M_data());
+ __rcs._M_data(__tmp_ptr);
+ _M_capacity(__rcs._M_allocated_capacity);
+ }
+ __rcs._M_capacity(__tmp_capacity);
+ }
+
+ const size_type __tmp_length = _M_length();
+ _M_length(__rcs._M_length());
+ __rcs._M_length(__tmp_length);
+ }
+
+ template<typename _CharT, typename _Traits, typename _Alloc>
+ _CharT*
+ __sso_string_base<_CharT, _Traits, _Alloc>::
+ _M_create(size_type& __capacity, size_type __old_capacity)
+ {
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 83. String::npos vs. string::max_size()
+ if (__capacity > _M_max_size())
+ std::__throw_length_error(__N("__sso_string_base::_M_create"));
+
+ // The below implements an exponential growth policy, necessary to
+ // meet amortized linear time requirements of the library: see
+ // http://gcc.gnu.org/ml/libstdc++/2001-07/msg00085.html.
+ if (__capacity > __old_capacity && __capacity < 2 * __old_capacity)
+ {
+ __capacity = 2 * __old_capacity;
+ // Never allocate a string bigger than max_size.
+ if (__capacity > _M_max_size())
+ __capacity = _M_max_size();
+ }
+
+ // NB: Need an array of char_type[__capacity], plus a terminating
+ // null char_type() element.
+ return _M_get_allocator().allocate(__capacity + 1);
+ }
+
+ template<typename _CharT, typename _Traits, typename _Alloc>
+ __sso_string_base<_CharT, _Traits, _Alloc>::
+ __sso_string_base(const _Alloc& __a)
+ : _M_dataplus(__a, _M_local_data)
+ { _M_set_length(0); }
+
+ template<typename _CharT, typename _Traits, typename _Alloc>
+ __sso_string_base<_CharT, _Traits, _Alloc>::
+ __sso_string_base(const __sso_string_base& __rcs)
+ : _M_dataplus(__rcs._M_get_allocator(), _M_local_data)
+ { _M_construct(__rcs._M_data(), __rcs._M_data() + __rcs._M_length()); }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ template<typename _CharT, typename _Traits, typename _Alloc>
+ __sso_string_base<_CharT, _Traits, _Alloc>::
+ __sso_string_base(__sso_string_base&& __rcs)
+ : _M_dataplus(__rcs._M_get_allocator(), _M_local_data)
+ {
+ if (__rcs._M_is_local())
+ {
+ if (__rcs._M_length())
+ traits_type::copy(_M_local_data, __rcs._M_local_data,
+ _S_local_capacity + 1);
+ }
+ else
+ {
+ _M_data(__rcs._M_data());
+ _M_capacity(__rcs._M_allocated_capacity);
+ }
+
+ _M_length(__rcs._M_length());
+ __rcs._M_length(0);
+ __rcs._M_data(__rcs._M_local_data);
+ }
+#endif
+
+ template<typename _CharT, typename _Traits, typename _Alloc>
+ __sso_string_base<_CharT, _Traits, _Alloc>::
+ __sso_string_base(size_type __n, _CharT __c, const _Alloc& __a)
+ : _M_dataplus(__a, _M_local_data)
+ { _M_construct(__n, __c); }
+
+ template<typename _CharT, typename _Traits, typename _Alloc>
+ template<typename _InputIterator>
+ __sso_string_base<_CharT, _Traits, _Alloc>::
+ __sso_string_base(_InputIterator __beg, _InputIterator __end,
+ const _Alloc& __a)
+ : _M_dataplus(__a, _M_local_data)
+ { _M_construct(__beg, __end); }
+
+ // NB: This is the special case for Input Iterators, used in
+ // istreambuf_iterators, etc.
+ // Input Iterators have a cost structure very different from
+ // pointers, calling for a different coding style.
+ template<typename _CharT, typename _Traits, typename _Alloc>
+ template<typename _InIterator>
+ void
+ __sso_string_base<_CharT, _Traits, _Alloc>::
+ _M_construct(_InIterator __beg, _InIterator __end,
+ std::input_iterator_tag)
+ {
+ size_type __len = 0;
+ size_type __capacity = size_type(_S_local_capacity);
+
+ while (__beg != __end && __len < __capacity)
+ {
+ _M_data()[__len++] = *__beg;
+ ++__beg;
+ }
+
+ __try
+ {
+ while (__beg != __end)
+ {
+ if (__len == __capacity)
+ {
+ // Allocate more space.
+ __capacity = __len + 1;
+ _CharT* __another = _M_create(__capacity, __len);
+ _S_copy(__another, _M_data(), __len);
+ _M_dispose();
+ _M_data(__another);
+ _M_capacity(__capacity);
+ }
+ _M_data()[__len++] = *__beg;
+ ++__beg;
+ }
+ }
+ __catch(...)
+ {
+ _M_dispose();
+ __throw_exception_again;
+ }
+
+ _M_set_length(__len);
+ }
+
+ template<typename _CharT, typename _Traits, typename _Alloc>
+ template<typename _InIterator>
+ void
+ __sso_string_base<_CharT, _Traits, _Alloc>::
+ _M_construct(_InIterator __beg, _InIterator __end,
+ std::forward_iterator_tag)
+ {
+ // NB: Not required, but considered best practice.
+ if (__builtin_expect(__is_null_pointer(__beg) && __beg != __end, 0))
+ std::__throw_logic_error(__N("__sso_string_base::"
+ "_M_construct NULL not valid"));
+
+ size_type __dnew = static_cast<size_type>(std::distance(__beg, __end));
+
+ if (__dnew > size_type(_S_local_capacity))
+ {
+ _M_data(_M_create(__dnew, size_type(0)));
+ _M_capacity(__dnew);
+ }
+
+ // Check for out_of_range and length_error exceptions.
+ __try
+ { _S_copy_chars(_M_data(), __beg, __end); }
+ __catch(...)
+ {
+ _M_dispose();
+ __throw_exception_again;
+ }
+
+ _M_set_length(__dnew);
+ }
+
+ template<typename _CharT, typename _Traits, typename _Alloc>
+ void
+ __sso_string_base<_CharT, _Traits, _Alloc>::
+ _M_construct(size_type __n, _CharT __c)
+ {
+ if (__n > size_type(_S_local_capacity))
+ {
+ _M_data(_M_create(__n, size_type(0)));
+ _M_capacity(__n);
+ }
+
+ if (__n)
+ _S_assign(_M_data(), __n, __c);
+
+ _M_set_length(__n);
+ }
+
+ template<typename _CharT, typename _Traits, typename _Alloc>
+ void
+ __sso_string_base<_CharT, _Traits, _Alloc>::
+ _M_assign(const __sso_string_base& __rcs)
+ {
+ if (this != &__rcs)
+ {
+ const size_type __rsize = __rcs._M_length();
+ const size_type __capacity = _M_capacity();
+
+ if (__rsize > __capacity)
+ {
+ size_type __new_capacity = __rsize;
+ _CharT* __tmp = _M_create(__new_capacity, __capacity);
+ _M_dispose();
+ _M_data(__tmp);
+ _M_capacity(__new_capacity);
+ }
+
+ if (__rsize)
+ _S_copy(_M_data(), __rcs._M_data(), __rsize);
+
+ _M_set_length(__rsize);
+ }
+ }
+
+ template<typename _CharT, typename _Traits, typename _Alloc>
+ void
+ __sso_string_base<_CharT, _Traits, _Alloc>::
+ _M_reserve(size_type __res)
+ {
+ // Make sure we don't shrink below the current size.
+ if (__res < _M_length())
+ __res = _M_length();
+
+ const size_type __capacity = _M_capacity();
+ if (__res != __capacity)
+ {
+ if (__res > __capacity
+ || __res > size_type(_S_local_capacity))
+ {
+ _CharT* __tmp = _M_create(__res, __capacity);
+ _S_copy(__tmp, _M_data(), _M_length() + 1);
+ _M_dispose();
+ _M_data(__tmp);
+ _M_capacity(__res);
+ }
+ else if (!_M_is_local())
+ {
+ _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,
+ const 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)
+ _S_copy(__r, _M_data(), __pos);
+ if (__s && __len2)
+ _S_copy(__r + __pos, __s, __len2);
+ if (__how_much)
+ _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)
+ _S_move(_M_data() + __pos, _M_data() + __pos + __n,
+ __how_much);
+
+ _M_set_length(_M_length() - __n);
+ }
+
+_GLIBCXX_END_NAMESPACE
+
+#endif /* _SSO_STRING_BASE_H */
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