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518 lines
14 KiB
C++
518 lines
14 KiB
C++
// <forward_list.tcc> -*- C++ -*-
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// Copyright (C) 2008-2019 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 bits/forward_list.tcc
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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{forward_list}
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*/
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#ifndef _FORWARD_LIST_TCC
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#define _FORWARD_LIST_TCC 1
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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_GLIBCXX_BEGIN_NAMESPACE_CONTAINER
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template<typename _Tp, typename _Alloc>
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_Fwd_list_base<_Tp, _Alloc>::
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_Fwd_list_base(_Fwd_list_base&& __lst, _Node_alloc_type&& __a)
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: _M_impl(std::move(__a))
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{
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if (__lst._M_get_Node_allocator() == _M_get_Node_allocator())
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this->_M_impl._M_head = std::move(__lst._M_impl._M_head);
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}
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template<typename _Tp, typename _Alloc>
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template<typename... _Args>
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_Fwd_list_node_base*
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_Fwd_list_base<_Tp, _Alloc>::
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_M_insert_after(const_iterator __pos, _Args&&... __args)
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{
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_Fwd_list_node_base* __to
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= const_cast<_Fwd_list_node_base*>(__pos._M_node);
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_Node* __thing = _M_create_node(std::forward<_Args>(__args)...);
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__thing->_M_next = __to->_M_next;
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__to->_M_next = __thing;
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return __to->_M_next;
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}
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template<typename _Tp, typename _Alloc>
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_Fwd_list_node_base*
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_Fwd_list_base<_Tp, _Alloc>::
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_M_erase_after(_Fwd_list_node_base* __pos)
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{
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_Node* __curr = static_cast<_Node*>(__pos->_M_next);
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__pos->_M_next = __curr->_M_next;
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_Node_alloc_traits::destroy(_M_get_Node_allocator(),
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__curr->_M_valptr());
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__curr->~_Node();
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_M_put_node(__curr);
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return __pos->_M_next;
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}
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template<typename _Tp, typename _Alloc>
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_Fwd_list_node_base*
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_Fwd_list_base<_Tp, _Alloc>::
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_M_erase_after(_Fwd_list_node_base* __pos,
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_Fwd_list_node_base* __last)
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{
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_Node* __curr = static_cast<_Node*>(__pos->_M_next);
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while (__curr != __last)
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{
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_Node* __temp = __curr;
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__curr = static_cast<_Node*>(__curr->_M_next);
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_Node_alloc_traits::destroy(_M_get_Node_allocator(),
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__temp->_M_valptr());
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__temp->~_Node();
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_M_put_node(__temp);
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}
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__pos->_M_next = __last;
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return __last;
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}
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// Called by the range constructor to implement [23.3.4.2]/9
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template<typename _Tp, typename _Alloc>
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template<typename _InputIterator>
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void
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forward_list<_Tp, _Alloc>::
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_M_range_initialize(_InputIterator __first, _InputIterator __last)
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{
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_Node_base* __to = &this->_M_impl._M_head;
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for (; __first != __last; ++__first)
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{
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__to->_M_next = this->_M_create_node(*__first);
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__to = __to->_M_next;
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}
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}
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// Called by forward_list(n,v,a).
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template<typename _Tp, typename _Alloc>
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void
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forward_list<_Tp, _Alloc>::
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_M_fill_initialize(size_type __n, const value_type& __value)
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{
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_Node_base* __to = &this->_M_impl._M_head;
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for (; __n; --__n)
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{
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__to->_M_next = this->_M_create_node(__value);
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__to = __to->_M_next;
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}
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}
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template<typename _Tp, typename _Alloc>
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void
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forward_list<_Tp, _Alloc>::
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_M_default_initialize(size_type __n)
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{
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_Node_base* __to = &this->_M_impl._M_head;
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for (; __n; --__n)
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{
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__to->_M_next = this->_M_create_node();
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__to = __to->_M_next;
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}
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}
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template<typename _Tp, typename _Alloc>
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forward_list<_Tp, _Alloc>&
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forward_list<_Tp, _Alloc>::
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operator=(const forward_list& __list)
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{
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if (std::__addressof(__list) != this)
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{
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if (_Node_alloc_traits::_S_propagate_on_copy_assign())
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{
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auto& __this_alloc = this->_M_get_Node_allocator();
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auto& __that_alloc = __list._M_get_Node_allocator();
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if (!_Node_alloc_traits::_S_always_equal()
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&& __this_alloc != __that_alloc)
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{
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// replacement allocator cannot free existing storage
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clear();
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}
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std::__alloc_on_copy(__this_alloc, __that_alloc);
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}
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assign(__list.cbegin(), __list.cend());
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}
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return *this;
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}
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template<typename _Tp, typename _Alloc>
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void
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forward_list<_Tp, _Alloc>::
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_M_default_insert_after(const_iterator __pos, size_type __n)
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{
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const_iterator __saved_pos = __pos;
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__try
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{
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for (; __n; --__n)
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__pos = emplace_after(__pos);
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}
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__catch(...)
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{
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erase_after(__saved_pos, ++__pos);
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__throw_exception_again;
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}
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}
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template<typename _Tp, typename _Alloc>
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void
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forward_list<_Tp, _Alloc>::
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resize(size_type __sz)
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{
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iterator __k = before_begin();
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size_type __len = 0;
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while (__k._M_next() != end() && __len < __sz)
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{
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++__k;
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++__len;
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}
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if (__len == __sz)
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erase_after(__k, end());
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else
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_M_default_insert_after(__k, __sz - __len);
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}
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template<typename _Tp, typename _Alloc>
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void
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forward_list<_Tp, _Alloc>::
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resize(size_type __sz, const value_type& __val)
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{
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iterator __k = before_begin();
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size_type __len = 0;
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while (__k._M_next() != end() && __len < __sz)
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{
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++__k;
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++__len;
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}
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if (__len == __sz)
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erase_after(__k, end());
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else
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insert_after(__k, __sz - __len, __val);
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}
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template<typename _Tp, typename _Alloc>
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typename forward_list<_Tp, _Alloc>::iterator
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forward_list<_Tp, _Alloc>::
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_M_splice_after(const_iterator __pos,
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const_iterator __before, const_iterator __last)
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{
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_Node_base* __tmp = const_cast<_Node_base*>(__pos._M_node);
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_Node_base* __b = const_cast<_Node_base*>(__before._M_node);
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_Node_base* __end = __b;
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while (__end && __end->_M_next != __last._M_node)
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__end = __end->_M_next;
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if (__b != __end)
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return iterator(__tmp->_M_transfer_after(__b, __end));
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else
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return iterator(__tmp);
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}
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template<typename _Tp, typename _Alloc>
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void
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forward_list<_Tp, _Alloc>::
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splice_after(const_iterator __pos, forward_list&&,
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const_iterator __i) noexcept
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{
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const_iterator __j = __i;
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++__j;
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if (__pos == __i || __pos == __j)
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return;
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_Node_base* __tmp = const_cast<_Node_base*>(__pos._M_node);
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__tmp->_M_transfer_after(const_cast<_Node_base*>(__i._M_node),
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const_cast<_Node_base*>(__j._M_node));
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}
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template<typename _Tp, typename _Alloc>
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typename forward_list<_Tp, _Alloc>::iterator
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forward_list<_Tp, _Alloc>::
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insert_after(const_iterator __pos, size_type __n, const _Tp& __val)
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{
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if (__n)
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{
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forward_list __tmp(__n, __val, get_allocator());
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return _M_splice_after(__pos, __tmp.before_begin(), __tmp.end());
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}
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else
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return iterator(const_cast<_Node_base*>(__pos._M_node));
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}
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template<typename _Tp, typename _Alloc>
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template<typename _InputIterator, typename>
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typename forward_list<_Tp, _Alloc>::iterator
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forward_list<_Tp, _Alloc>::
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insert_after(const_iterator __pos,
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_InputIterator __first, _InputIterator __last)
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{
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forward_list __tmp(__first, __last, get_allocator());
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if (!__tmp.empty())
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return _M_splice_after(__pos, __tmp.before_begin(), __tmp.end());
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else
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return iterator(const_cast<_Node_base*>(__pos._M_node));
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}
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#if __cplusplus > 201703L
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# define _GLIBCXX20_ONLY(__expr) __expr
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#else
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# define _GLIBCXX20_ONLY(__expr)
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#endif
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template<typename _Tp, typename _Alloc>
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auto
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forward_list<_Tp, _Alloc>::
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remove(const _Tp& __val) -> __remove_return_type
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{
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size_type __removed __attribute__((__unused__)) = 0;
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_Node_base* __curr = &this->_M_impl._M_head;
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_Node_base* __extra = nullptr;
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while (_Node* __tmp = static_cast<_Node*>(__curr->_M_next))
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{
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if (*__tmp->_M_valptr() == __val)
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{
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if (__tmp->_M_valptr() != std::__addressof(__val))
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{
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this->_M_erase_after(__curr);
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_GLIBCXX20_ONLY( __removed++ );
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continue;
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}
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else
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__extra = __curr;
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}
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__curr = __curr->_M_next;
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}
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if (__extra)
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{
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this->_M_erase_after(__extra);
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_GLIBCXX20_ONLY( __removed++ );
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}
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return _GLIBCXX20_ONLY( __removed );
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}
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template<typename _Tp, typename _Alloc>
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template<typename _Pred>
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auto
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forward_list<_Tp, _Alloc>::
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remove_if(_Pred __pred) -> __remove_return_type
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{
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size_type __removed __attribute__((__unused__)) = 0;
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_Node_base* __curr = &this->_M_impl._M_head;
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while (_Node* __tmp = static_cast<_Node*>(__curr->_M_next))
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{
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if (__pred(*__tmp->_M_valptr()))
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{
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this->_M_erase_after(__curr);
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_GLIBCXX20_ONLY( __removed++ );
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}
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else
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__curr = __curr->_M_next;
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}
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return _GLIBCXX20_ONLY( __removed );
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}
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template<typename _Tp, typename _Alloc>
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template<typename _BinPred>
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auto
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forward_list<_Tp, _Alloc>::
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unique(_BinPred __binary_pred) -> __remove_return_type
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{
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iterator __first = begin();
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iterator __last = end();
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if (__first == __last)
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return _GLIBCXX20_ONLY(0);
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size_type __removed __attribute__((__unused__)) = 0;
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iterator __next = __first;
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while (++__next != __last)
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{
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if (__binary_pred(*__first, *__next))
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{
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erase_after(__first);
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_GLIBCXX20_ONLY( __removed++ );
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}
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else
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__first = __next;
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__next = __first;
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}
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return _GLIBCXX20_ONLY( __removed );
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}
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#undef _GLIBCXX20_ONLY
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template<typename _Tp, typename _Alloc>
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template<typename _Comp>
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void
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forward_list<_Tp, _Alloc>::
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merge(forward_list&& __list, _Comp __comp)
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{
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_Node_base* __node = &this->_M_impl._M_head;
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while (__node->_M_next && __list._M_impl._M_head._M_next)
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{
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if (__comp(*static_cast<_Node*>
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(__list._M_impl._M_head._M_next)->_M_valptr(),
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*static_cast<_Node*>
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(__node->_M_next)->_M_valptr()))
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__node->_M_transfer_after(&__list._M_impl._M_head,
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__list._M_impl._M_head._M_next);
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__node = __node->_M_next;
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}
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if (__list._M_impl._M_head._M_next)
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*__node = std::move(__list._M_impl._M_head);
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}
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template<typename _Tp, typename _Alloc>
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bool
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operator==(const forward_list<_Tp, _Alloc>& __lx,
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const forward_list<_Tp, _Alloc>& __ly)
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{
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// We don't have size() so we need to walk through both lists
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// making sure both iterators are valid.
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auto __ix = __lx.cbegin();
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auto __iy = __ly.cbegin();
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while (__ix != __lx.cend() && __iy != __ly.cend())
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{
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if (!(*__ix == *__iy))
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return false;
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++__ix;
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++__iy;
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}
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if (__ix == __lx.cend() && __iy == __ly.cend())
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return true;
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else
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return false;
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}
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template<typename _Tp, class _Alloc>
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template<typename _Comp>
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void
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forward_list<_Tp, _Alloc>::
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sort(_Comp __comp)
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{
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// If `next' is nullptr, return immediately.
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_Node* __list = static_cast<_Node*>(this->_M_impl._M_head._M_next);
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if (!__list)
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return;
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unsigned long __insize = 1;
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while (1)
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{
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_Node* __p = __list;
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__list = nullptr;
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_Node* __tail = nullptr;
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// Count number of merges we do in this pass.
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unsigned long __nmerges = 0;
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while (__p)
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{
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++__nmerges;
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// There exists a merge to be done.
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// Step `insize' places along from p.
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_Node* __q = __p;
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unsigned long __psize = 0;
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for (unsigned long __i = 0; __i < __insize; ++__i)
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{
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++__psize;
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__q = static_cast<_Node*>(__q->_M_next);
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if (!__q)
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break;
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}
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// If q hasn't fallen off end, we have two lists to merge.
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unsigned long __qsize = __insize;
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// Now we have two lists; merge them.
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while (__psize > 0 || (__qsize > 0 && __q))
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{
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// Decide whether next node of merge comes from p or q.
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_Node* __e;
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if (__psize == 0)
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{
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// p is empty; e must come from q.
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__e = __q;
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__q = static_cast<_Node*>(__q->_M_next);
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--__qsize;
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}
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else if (__qsize == 0 || !__q)
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{
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// q is empty; e must come from p.
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__e = __p;
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__p = static_cast<_Node*>(__p->_M_next);
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--__psize;
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}
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else if (!__comp(*__q->_M_valptr(), *__p->_M_valptr()))
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{
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// First node of q is not lower; e must come from p.
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__e = __p;
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__p = static_cast<_Node*>(__p->_M_next);
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--__psize;
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}
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else
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{
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// First node of q is lower; e must come from q.
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__e = __q;
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__q = static_cast<_Node*>(__q->_M_next);
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--__qsize;
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}
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// Add the next node to the merged list.
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if (__tail)
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__tail->_M_next = __e;
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else
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__list = __e;
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__tail = __e;
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}
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// Now p has stepped `insize' places along, and q has too.
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__p = __q;
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}
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__tail->_M_next = nullptr;
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// If we have done only one merge, we're finished.
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// Allow for nmerges == 0, the empty list case.
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if (__nmerges <= 1)
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{
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this->_M_impl._M_head._M_next = __list;
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return;
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}
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// Otherwise repeat, merging lists twice the size.
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__insize *= 2;
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}
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}
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_GLIBCXX_END_NAMESPACE_CONTAINER
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace std
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#endif /* _FORWARD_LIST_TCC */
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