/home/ntakagi/work/STLport-5.1.5/stlport/stl/_string_sum_methods.h Go to the documentation of this file. /* * Copyright (c) 2003 * Francois Dumont * * This material is provided "as is", with absolutely no warranty expressed * or implied. Any use is at your own risk. * * Permission to use or copy this software for any purpose is hereby granted * without fee, provided the above notices are retained on all copies. * Permission to modify the code and to distribute modified code is granted, * provided the above notices are retained, and a notice that the code was * modified is included with the above copyright notice. * */ /* * All the necessary methods used for template expressions with basic_string * This file do not have to be macro guarded as it is only used in the _string.h * file and it is a part of the basic_string definition. */ public: template <class _Left, class _Right, class _StorageDir> basic_string(_STLP_PRIV __bstr_sum<_CharT, _Traits, _Alloc, _Left, _Right, _StorageDir> const& __s) : _STLP_STRING_SUM_BASE(_Reserve_t(), __s.size(), __s.get_allocator()) { _M_append_sum(__s); } template <class _Left, class _Right, class _StorageDir> basic_string(_STLP_PRIV __bstr_sum<_CharT, _Traits, _Alloc, _Left, _Right, _StorageDir> const& __s, size_type __pos, size_type __n = npos, const allocator_type& __a = allocator_type()) : _STLP_STRING_SUM_BASE(_Reserve_t(), (__pos <= __s.size()) ? ((min) (__n, __s.size() - __pos)) : 0, __a) { size_type __size = __s.size(); if (__pos > __size) this->_M_throw_out_of_range(); else _M_append_sum_pos(__s, __pos, (min) (__n, __size - __pos)); } private: _CharT* _M_append_fast(_STLP_PRIV __char_wrapper<_CharT> __c, _CharT *__buf) { _STLP_STD::_Copy_Construct(__buf, __c.getValue()); return __buf + 1; } _CharT* _M_append_fast(_CharT const* __s, size_type __s_size, _CharT *__buf) { return uninitialized_copy(__s, __s + __s_size, __buf); } _CharT* _M_append_fast(_STLP_PRIV __cstr_wrapper<_CharT> const& __s, _CharT *__buf) { return _M_append_fast(__s.c_str(), __s.size(), __buf); } _CharT* _M_append_fast(_STLP_PRIV __bstr_wrapper<_CharT, _Traits, _Alloc> __s, _CharT *__buf) { return _M_append_fast(__s.b_str(), __buf); } _CharT* _M_append_fast(_Self const& __s, _CharT *__buf) { return _M_append_fast(__s.data(), __s.size(), __buf); } _CharT* _M_append_fast(_STLP_PRIV __sum_storage_elem<_CharT, _Traits, _Alloc> const&, _CharT *__buf) { return __buf; } template <class _Left, class _Right, class _StorageDir> _CharT* _M_append_fast(_STLP_PRIV __bstr_sum<_CharT, _Traits, _Alloc, _Left, _Right, _StorageDir> const& __s, _CharT *__buf) { return _M_append_fast(__s.getRhs(), _M_append_fast(__s.getLhs(), __buf)); } _CharT* _M_append_fast_pos(_STLP_PRIV __char_wrapper<_CharT> __c, _CharT *__buf, size_type /*__pos*/, size_type __n) { if (__n == 0) return __buf; _STLP_STD::_Copy_Construct(__buf, __c.getValue()); return __buf + 1; } _CharT* _M_append_fast_pos(_CharT const* __s, size_type __s_size, _CharT *__buf, size_type __pos, size_type __n) { return uninitialized_copy(__s + __pos, __s + __pos + (min)(__n, __s_size - __pos), __buf); } _CharT* _M_append_fast_pos(_STLP_PRIV __cstr_wrapper<_CharT> const& __s, _CharT *__buf, size_type __pos, size_type __n) { return _M_append_fast_pos(__s.c_str(), __s.size(), __buf, __pos, __n); } _CharT* _M_append_fast_pos(_STLP_PRIV __bstr_wrapper<_CharT, _Traits, _Alloc> __s, _CharT *__buf, size_type __pos, size_type __n) { return _M_append_fast_pos(__s.b_str(), __buf, __pos, __n); } _CharT* _M_append_fast_pos(_Self const& __s, _CharT *__buf, size_type __pos, size_type __n) { return _M_append_fast_pos(__s.data(), __s.size(), __buf, __pos, __n); } _CharT* _M_append_fast_pos(_STLP_PRIV __sum_storage_elem<_CharT, _Traits, _Alloc> const&, _CharT *__buf, size_type, size_type) { return __buf; } template <class _Left, class _Right, class _StorageDir> _CharT* _M_append_fast_pos(_STLP_PRIV __bstr_sum<_CharT, _Traits, _Alloc, _Left, _Right, _StorageDir> const& __s, _CharT *__buf, size_type __pos, size_type __n) { if (__n == 0) { return __buf; } size_type __lhs_size = __s.getLhs().size(); if (__pos < __lhs_size) { if (__n < (__lhs_size - __pos)) { return _M_append_fast_pos(__s.getLhs(), __buf, __pos, __n); } else { return _M_append_fast_pos(__s.getRhs(), _M_append_fast_pos(__s.getLhs(), __buf, __pos, __n), 0, __n - (__lhs_size - __pos)); } } else { return _M_append_fast_pos(__s.getRhs(), __buf, __pos - __lhs_size, __n); } } /* Note: We always force use of dynamic buffer if the short string optim option is activated * to avoid complicated code if the basic_string was instanciated with a non POD type. * In such a case we should use assignment for objects in the static array something that we * do not do. */ size_type _M_get_additional_size(size_type __new_size, const __false_type& /*_Char_Is_POD*/) const { #if defined (_STLP_USE_SHORT_STRING_OPTIM) //To avoid problem with the string assumptions, never allocate a dynamic buffer smaller or equal //than the static one: if (__new_size < _Base::_DEFAULT_SIZE + 1) return (_Base::_DEFAULT_SIZE + 1) - __new_size; #endif /* _STLP_USE_SHORT_STRING_OPTIM */ return 0; } size_type _M_get_additional_size(size_type, const __true_type& /*_Char_Is_POD*/) const { return 0; } template <class _Left, class _Right, class _StorageDir> _Self& _M_append_sum (_STLP_PRIV __bstr_sum<_CharT, _Traits, _Alloc, _Left, _Right, _StorageDir> const& __s) { size_type __s_size = __s.size(); if (__s_size == 0) return *this; const size_type __old_size = this->size(); if (__s_size > this->max_size() || __old_size > (this->max_size() - __s_size)) this->_M_throw_length_error(); size_type __offset_size = _M_get_additional_size(__old_size + __s_size, _Char_Is_POD()); if (__old_size + __s_size + __offset_size > this->capacity()) { const size_type __len = __old_size + __offset_size + (max)(__old_size, __s_size) + 1; pointer __new_start = this->_M_end_of_storage.allocate(__len); pointer __new_finish = __new_start; _STLP_TRY { __new_finish = uninitialized_copy(this->_M_Start(), this->_M_Finish(), __new_start); __new_finish = this->_M_append_fast(__s, __new_finish); this->_M_construct_null(__new_finish); } _STLP_UNWIND((_STLP_STD::_Destroy_Range(__new_start,__new_finish), this->_M_end_of_storage.deallocate(__new_start,__len))) this->_M_destroy_range(); this->_M_deallocate_block(); this->_M_reset(__new_start, __new_finish, __new_start + __len); } else { _M_append_sum_no_overflow(__s, 0, __s_size); } return *this; } template <class _Left, class _Right, class _StorageDir> _Self& _M_append_sum_pos(_STLP_PRIV __bstr_sum<_CharT, _Traits, _Alloc, _Left, _Right, _StorageDir> const& __s, size_type __pos, size_type __n) { size_type __s_size = (min)(__s.size() - __pos, __n); if (__s_size == 0) return *this; const size_type __old_size = this->size(); if (__s_size > this->max_size() || __old_size > (this->max_size() - __s_size)) this->_M_throw_length_error(); size_type __offset_size = _M_get_additional_size(__old_size + __s_size, _Char_Is_POD()); if (__old_size + __s_size + __offset_size > this->capacity()) { const size_type __len = __old_size + __offset_size + (max)(__old_size, __s_size) + 1; pointer __new_start = this->_M_end_of_storage.allocate(__len); pointer __new_finish = __new_start; _STLP_TRY { __new_finish = uninitialized_copy(this->_M_Start(), this->_M_Finish(), __new_start); __new_finish = _M_append_fast_pos(__s, __new_finish, __pos, __s_size); this->_M_construct_null(__new_finish); } _STLP_UNWIND((_STLP_STD::_Destroy_Range(__new_start,__new_finish), this->_M_end_of_storage.deallocate(__new_start,__len))) this->_M_destroy_range(); this->_M_deallocate_block(); this->_M_reset(__new_start, __new_finish, __new_start + __len); } else { _M_append_sum_no_overflow(__s, __pos, __s_size); } return *this; } template <class _Left, class _Right, class _StorageDir> void _M_append_sum_no_overflow(_STLP_PRIV __bstr_sum<_CharT, _Traits, _Alloc, _Left, _Right, _StorageDir> const& __s, size_type __pos, size_type __n) { pointer __finish = this->_M_Finish(); _M_append_fast_pos(__s, __finish + 1, __pos + 1, __n - 1); _STLP_TRY { this->_M_construct_null(__finish + __n); } _STLP_UNWIND(this->_M_destroy_ptr_range(__finish + 1, __finish + __n)) /* The call to the traits::assign method is only important for non POD types because the instance * pointed to by _M_finish has been constructed (default constructor) and should not be constructed * (copy constructor) once again. For POD it is irrelevant, uninitialized_copy could be fine, * but we are not going to make two implementations just for that. */ _Traits::assign(*this->_M_finish, __s[__pos]); this->_M_finish += __n; }

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