mirror of
https://github.com/DrBeef/Raze.git
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737291ce5f
This needed some editing and cleanup to get it to work without half of the rest of EASTL for mostly useless things. This assumes C++17 and removes the sort function which was the main culprit for making the thing non self-contained.
1160 lines
36 KiB
C++
1160 lines
36 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// Copyright (c) Electronic Arts Inc. All rights reserved.
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///////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////
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// The intrusive list container is similar to a list, with the primary
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// different being that intrusive lists allow you to control memory
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// allocation.
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//
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// * Intrusive lists store the nodes directly in the data items. This
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// is done by deriving the object from intrusive_list_node.
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//
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// * The container does no memory allocation -- it works entirely with
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// the submitted nodes. This does mean that it is the client's job to
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// free the nodes in an intrusive list, though.
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//
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// * Valid node pointers can be converted back to iterators in O(1).
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// This is because objects in the list are also nodes in the list.
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//
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// * intrusive_list does not support copy construction or assignment;
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// the push, pop, and insert operations take ownership of the
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// passed object.
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//
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// Usage notes:
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//
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// * You can use an intrusive_list directly with the standard nodes
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// if you have some other way of converting the node pointer back
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// to your data pointer.
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//
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// * Remember that the list destructor doesn't deallocate nodes -- it can't.
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//
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// * The size is not cached; this makes size() linear time but splice() is
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// constant time. This does mean that you can remove() an element without
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// having to figure out which list it is in, however.
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//
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// * You can insert a node into multiple intrusive_lists. One way to do so
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// is to (ab)use inheritance:
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//
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// struct NodeA : public intrusive_list_node {};
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// struct NodeB : public intrusive_list_node {};
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// struct Object : public NodeA, nodeB {};
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//
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// intrusive_list<NodeA> listA;
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// intrusive_list<NodeB> listB;
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//
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// listA.push_back(obj);
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// listB.push_back(obj);
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//
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// * find() vs. locate()
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// The find(v) algorithm returns an iterator p such that *p == v; intrusive_list::locate(v)
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// returns an iterator p such that &*p == &v. intrusive_list<> doesn't have find() mainly
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// because list<> doesn't have it either, but there's no reason it couldn't. intrusive_list
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// uses the name 'find' because:
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// - So as not to confuse the member function with the well-defined free function from algorithm.h.
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// - Because it is not API-compatible with eastl::find().
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// - Because it simply locates an object within the list based on its node entry and doesn't perform before any value-based searches or comparisons.
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//
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// Differences between intrusive_list and std::list:
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//
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// Issue std::list intrusive_list
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// --------------------------------------------------------------
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// Automatic node ctor/dtor Yes No
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// Can memmove() container Maybe* No
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// Same item in list twice Yes(copy/byref) No
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// Can store non-copyable items No Yes
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// size() O(1) or O(n) O(n)
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// clear() O(n) O(1)
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// erase(range) O(n) O(1)
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// splice(range) O(1) or O(n) O(1)
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// Convert reference to iterator No O(1)
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// Remove without container No O(1)
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// Nodes in mixed allocators No Yes
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//
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// *) Not required by standard but can be done with some STL implementations.
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//
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///////////////////////////////////////////////////////////////////////////////
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#ifndef EASTL_INTRUSIVE_LIST_H
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#define EASTL_INTRUSIVE_LIST_H
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//#include <EASTL/internal/config.h>
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//#include <EASTL/iterator.h>
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//#include <EASTL/algorithm.h>
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#if defined(EA_PRAGMA_ONCE_SUPPORTED)
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#pragma once // Some compilers (e.g. VC++) benefit significantly from using this. We've measured 3-4% build speed improvements in apps as a result.
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#endif
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namespace eastl
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{
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/// intrusive_list_node
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///
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/// By design this must be a POD, as user structs will be inheriting from
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/// it and they may wish to remain POD themselves. However, if the
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/// EASTL_VALIDATE_INTRUSIVE_LIST option is enabled
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///
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struct intrusive_list_node
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{
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intrusive_list_node* mpNext;
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intrusive_list_node* mpPrev;
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};
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/// intrusive_list_iterator
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///
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template <typename T, typename Pointer, typename Reference>
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class intrusive_list_iterator
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{
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public:
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typedef intrusive_list_iterator<T, Pointer, Reference> this_type;
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typedef intrusive_list_iterator<T, T*, T&> iterator;
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typedef intrusive_list_iterator<T, const T*, const T&> const_iterator;
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typedef T value_type;
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typedef T node_type;
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typedef ptrdiff_t difference_type;
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typedef Pointer pointer;
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typedef Reference reference;
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typedef std::bidirectional_iterator_tag iterator_category;
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public:
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pointer mpNode; // Needs to be public for operator==() to work
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public:
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intrusive_list_iterator();
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explicit intrusive_list_iterator(pointer pNode); // Note that you can also construct an iterator from T via this, since value_type == node_type.
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intrusive_list_iterator(const iterator& x);
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intrusive_list_iterator& operator=(const iterator& x);
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reference operator*() const;
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pointer operator->() const;
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intrusive_list_iterator& operator++();
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intrusive_list_iterator& operator--();
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intrusive_list_iterator operator++(int);
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intrusive_list_iterator operator--(int);
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}; // class intrusive_list_iterator
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/// intrusive_list_base
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///
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class intrusive_list_base
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{
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public:
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typedef size_t size_type;
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typedef ptrdiff_t difference_type;
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protected:
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intrusive_list_node mAnchor; ///< Sentinel node (end). All data nodes are linked in a ring from this node.
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public:
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intrusive_list_base();
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~intrusive_list_base();
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bool empty() const noexcept;
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size_t size() const noexcept; ///< Returns the number of elements in the list; O(n).
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void clear() noexcept; ///< Clears the list; O(1). No deallocation occurs.
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void pop_front(); ///< Removes an element from the front of the list; O(1). The element must exist, but is not deallocated.
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void pop_back(); ///< Removes an element from the back of the list; O(1). The element must exist, but is not deallocated.
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void reverse() noexcept; ///< Reverses a list so that front and back are swapped; O(n).
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bool validate() const; ///< Scans a list for linkage inconsistencies; O(n) time, O(1) space. Returns false if errors are detected, such as loops or branching.
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}; // class intrusive_list_base
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/// intrusive_list
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///
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/// Example usage:
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/// struct IntNode : public eastl::intrusive_list_node {
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/// int mX;
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/// IntNode(int x) : mX(x) { }
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/// };
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///
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/// IntNode nodeA(0);
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/// IntNode nodeB(1);
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///
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/// intrusive_list<IntNode> intList;
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/// intList.push_back(nodeA);
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/// intList.push_back(nodeB);
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/// intList.remove(nodeA);
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///
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template <typename T = intrusive_list_node>
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class intrusive_list : public intrusive_list_base
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{
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public:
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typedef intrusive_list<T> this_type;
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typedef intrusive_list_base base_type;
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typedef T node_type;
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typedef T value_type;
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typedef typename base_type::size_type size_type;
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typedef typename base_type::difference_type difference_type;
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typedef T& reference;
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typedef const T& const_reference;
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typedef T* pointer;
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typedef const T* const_pointer;
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typedef intrusive_list_iterator<T, T*, T&> iterator;
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typedef intrusive_list_iterator<T, const T*, const T&> const_iterator;
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typedef std::reverse_iterator<iterator> reverse_iterator;
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typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
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public:
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intrusive_list(); ///< Creates an empty list.
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intrusive_list(const this_type& x); ///< Creates an empty list; ignores the argument.
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//intrusive_list(std::initializer_list<value_type> ilist); To consider: Is this feasible, given how initializer_list works by creating a temporary array? Even if it is feasible, is it a good idea?
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this_type& operator=(const this_type& x); ///< Clears the list; ignores the argument.
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void swap(this_type&); ///< Swaps the contents of two intrusive lists; O(1).
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iterator begin() noexcept; ///< Returns an iterator pointing to the first element in the list.
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const_iterator begin() const noexcept; ///< Returns a const_iterator pointing to the first element in the list.
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const_iterator cbegin() const noexcept; ///< Returns a const_iterator pointing to the first element in the list.
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iterator end() noexcept; ///< Returns an iterator pointing one-after the last element in the list.
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const_iterator end() const noexcept; ///< Returns a const_iterator pointing one-after the last element in the list.
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const_iterator cend() const noexcept; ///< Returns a const_iterator pointing one-after the last element in the list.
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reverse_iterator rbegin() noexcept; ///< Returns a reverse_iterator pointing at the end of the list (start of the reverse sequence).
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const_reverse_iterator rbegin() const noexcept; ///< Returns a const_reverse_iterator pointing at the end of the list (start of the reverse sequence).
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const_reverse_iterator crbegin() const noexcept; ///< Returns a const_reverse_iterator pointing at the end of the list (start of the reverse sequence).
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reverse_iterator rend() noexcept; ///< Returns a reverse_iterator pointing at the start of the list (end of the reverse sequence).
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const_reverse_iterator rend() const noexcept; ///< Returns a const_reverse_iterator pointing at the start of the list (end of the reverse sequence).
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const_reverse_iterator crend() const noexcept; ///< Returns a const_reverse_iterator pointing at the start of the list (end of the reverse sequence).
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reference front(); ///< Returns a reference to the first element. The list must be non-empty.
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const_reference front() const; ///< Returns a const reference to the first element. The list must be non-empty.
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reference back(); ///< Returns a reference to the last element. The list must be non-empty.
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const_reference back() const; ///< Returns a const reference to the last element. The list must be non-empty.
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void push_front(value_type& x); ///< Adds an element to the front of the list; O(1). The element is not copied. The element must not be in any other list.
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void push_back(value_type& x); ///< Adds an element to the back of the list; O(1). The element is not copied. The element must not be in any other list.
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bool contains(const value_type& x) const; ///< Returns true if the given element is in the list; O(n). Equivalent to (locate(x) != end()).
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iterator locate(value_type& x); ///< Converts a reference to an object in the list back to an iterator, or returns end() if it is not part of the list. O(n)
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const_iterator locate(const value_type& x) const; ///< Converts a const reference to an object in the list back to a const iterator, or returns end() if it is not part of the list. O(n)
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iterator insert(const_iterator pos, value_type& x); ///< Inserts an element before the element pointed to by the iterator. O(1)
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iterator erase(const_iterator pos); ///< Erases the element pointed to by the iterator. O(1)
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iterator erase(const_iterator pos, const_iterator last); ///< Erases elements within the iterator range [pos, last). O(1)
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reverse_iterator erase(const_reverse_iterator pos);
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reverse_iterator erase(const_reverse_iterator pos, const_reverse_iterator last);
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static void remove(value_type& value); ///< Erases an element from a list; O(1). Note that this is static so you don't need to know which list the element, although it must be in some list.
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void splice(const_iterator pos, value_type& x);
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///< Moves the given element into this list before the element pointed to by pos; O(1).
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///< Required: x must be in some list or have first/next pointers that point it itself.
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void splice(const_iterator pos, intrusive_list& x);
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///< Moves the contents of a list into this list before the element pointed to by pos; O(1).
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///< Required: &x != this (same as std::list).
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void splice(const_iterator pos, intrusive_list& x, const_iterator i);
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///< Moves the given element pointed to i within the list x into the current list before
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///< the element pointed to by pos; O(1).
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void splice(const_iterator pos, intrusive_list& x, const_iterator first, const_iterator last);
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///< Moves the range of elements [first, last) from list x into the current list before
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///< the element pointed to by pos; O(1).
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///< Required: pos must not be in [first, last). (same as std::list).
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public:
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// Sorting functionality
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// This is independent of the global sort algorithms, as lists are
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// linked nodes and can be sorted more efficiently by moving nodes
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// around in ways that global sort algorithms aren't privy to.
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void merge(this_type& x);
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template <typename Compare>
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void merge(this_type& x, Compare compare);
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void unique();
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template <typename BinaryPredicate>
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void unique(BinaryPredicate);
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void sort();
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template<typename Compare>
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void sort(Compare compare);
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public:
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}; // intrusive_list
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///////////////////////////////////////////////////////////////////////
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// intrusive_list_node
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///////////////////////////////////////////////////////////////////////
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// Moved to be inline within the class because the may-alias attribute is
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// triggering what appears to be a bug in GCC that effectively requires
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// may-alias structs to implement inline member functions within the class
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// declaration. We don't have a .cpp file for
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// #if EASTL_VALIDATE_INTRUSIVE_LIST
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// inline intrusive_list_node::intrusive_list_node()
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// {
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// mpNext = mpPrev = NULL;
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// }
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//
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// inline intrusive_list_node::~intrusive_list_node()
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// {
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// #if EASTL_ASSERT_ENABLED
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// if(mpNext || mpPrev)
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// EASTL_FAIL_MSG("~intrusive_list_node(): List is non-empty.");
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// #endif
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// }
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// #endif
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///////////////////////////////////////////////////////////////////////
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// intrusive_list_iterator
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///////////////////////////////////////////////////////////////////////
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template <typename T, typename Pointer, typename Reference>
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inline intrusive_list_iterator<T, Pointer, Reference>::intrusive_list_iterator()
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{
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#if EASTL_DEBUG
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mpNode = NULL;
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#endif
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}
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template <typename T, typename Pointer, typename Reference>
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inline intrusive_list_iterator<T, Pointer, Reference>::intrusive_list_iterator(pointer pNode)
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: mpNode(pNode)
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{
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// Empty
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}
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template <typename T, typename Pointer, typename Reference>
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inline intrusive_list_iterator<T, Pointer, Reference>::intrusive_list_iterator(const iterator& x)
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: mpNode(x.mpNode)
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{
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// Empty
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}
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template <typename T, typename Pointer, typename Reference>
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inline typename intrusive_list_iterator<T, Pointer, Reference>::this_type&
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intrusive_list_iterator<T, Pointer, Reference>::operator=(const iterator& x)
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{
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mpNode = x.mpNode;
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return *this;
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}
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template <typename T, typename Pointer, typename Reference>
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inline typename intrusive_list_iterator<T, Pointer, Reference>::reference
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intrusive_list_iterator<T, Pointer, Reference>::operator*() const
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{
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return *mpNode;
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}
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template <typename T, typename Pointer, typename Reference>
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inline typename intrusive_list_iterator<T, Pointer, Reference>::pointer
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intrusive_list_iterator<T, Pointer, Reference>::operator->() const
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{
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return mpNode;
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}
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template <typename T, typename Pointer, typename Reference>
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inline typename intrusive_list_iterator<T, Pointer, Reference>::this_type&
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intrusive_list_iterator<T, Pointer, Reference>::operator++()
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{
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mpNode = static_cast<node_type*>(mpNode->mpNext);
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return *this;
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}
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template <typename T, typename Pointer, typename Reference>
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inline typename intrusive_list_iterator<T, Pointer, Reference>::this_type
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intrusive_list_iterator<T, Pointer, Reference>::operator++(int)
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{
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intrusive_list_iterator it(*this);
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mpNode = static_cast<node_type*>(mpNode->mpNext);
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return it;
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}
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template <typename T, typename Pointer, typename Reference>
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inline typename intrusive_list_iterator<T, Pointer, Reference>::this_type&
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intrusive_list_iterator<T, Pointer, Reference>::operator--()
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{
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mpNode = static_cast<node_type*>(mpNode->mpPrev);
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return *this;
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}
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template <typename T, typename Pointer, typename Reference>
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inline typename intrusive_list_iterator<T, Pointer, Reference>::this_type
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intrusive_list_iterator<T, Pointer, Reference>::operator--(int)
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{
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intrusive_list_iterator it(*this);
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mpNode = static_cast<node_type*>(mpNode->mpPrev);
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return it;
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}
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// The C++ defect report #179 requires that we support comparisons between const and non-const iterators.
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// Thus we provide additional template paremeters here to support this. The defect report does not
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// require us to support comparisons between reverse_iterators and const_reverse_iterators.
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template <typename T, typename PointerA, typename ReferenceA, typename PointerB, typename ReferenceB>
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inline bool operator==(const intrusive_list_iterator<T, PointerA, ReferenceA>& a,
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const intrusive_list_iterator<T, PointerB, ReferenceB>& b)
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{
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return a.mpNode == b.mpNode;
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}
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template <typename T, typename PointerA, typename ReferenceA, typename PointerB, typename ReferenceB>
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inline bool operator!=(const intrusive_list_iterator<T, PointerA, ReferenceA>& a,
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const intrusive_list_iterator<T, PointerB, ReferenceB>& b)
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{
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return a.mpNode != b.mpNode;
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}
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// We provide a version of operator!= for the case where the iterators are of the
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// same type. This helps prevent ambiguity errors in the presence of rel_ops.
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template <typename T, typename Pointer, typename Reference>
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inline bool operator!=(const intrusive_list_iterator<T, Pointer, Reference>& a,
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const intrusive_list_iterator<T, Pointer, Reference>& b)
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{
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return a.mpNode != b.mpNode;
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}
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///////////////////////////////////////////////////////////////////////
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// intrusive_list_base
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///////////////////////////////////////////////////////////////////////
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inline intrusive_list_base::intrusive_list_base()
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{
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mAnchor.mpNext = mAnchor.mpPrev = &mAnchor;
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}
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inline intrusive_list_base::~intrusive_list_base()
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{
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#if EASTL_VALIDATE_INTRUSIVE_LIST
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clear();
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mAnchor.mpNext = mAnchor.mpPrev = NULL;
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#endif
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}
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inline bool intrusive_list_base::empty() const noexcept
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{
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return mAnchor.mpPrev == &mAnchor;
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}
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inline intrusive_list_base::size_type intrusive_list_base::size() const noexcept
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{
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const intrusive_list_node* p = &mAnchor;
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size_type n = (size_type)-1;
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do {
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++n;
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p = p->mpNext;
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} while(p != &mAnchor);
|
|
|
|
return n;
|
|
}
|
|
|
|
|
|
inline void intrusive_list_base::clear() noexcept
|
|
{
|
|
#if EASTL_VALIDATE_INTRUSIVE_LIST
|
|
// Need to clear out all the next/prev pointers in the elements;
|
|
// this makes this operation O(n) instead of O(1).
|
|
intrusive_list_node* pNode = mAnchor.mpNext;
|
|
|
|
while(pNode != &mAnchor)
|
|
{
|
|
intrusive_list_node* const pNextNode = pNode->mpNext;
|
|
pNode->mpNext = pNode->mpPrev = NULL;
|
|
pNode = pNextNode;
|
|
}
|
|
#endif
|
|
|
|
mAnchor.mpNext = mAnchor.mpPrev = &mAnchor;
|
|
}
|
|
|
|
|
|
inline void intrusive_list_base::pop_front()
|
|
{
|
|
#if EASTL_VALIDATE_INTRUSIVE_LIST
|
|
intrusive_list_node* const pNode = mAnchor.mpNext;
|
|
#endif
|
|
|
|
mAnchor.mpNext->mpNext->mpPrev = &mAnchor;
|
|
mAnchor.mpNext = mAnchor.mpNext->mpNext;
|
|
|
|
#if EASTL_VALIDATE_INTRUSIVE_LIST
|
|
if(pNode != &mAnchor)
|
|
pNode->mpNext = pNode->mpPrev = NULL;
|
|
#if EASTL_ASSERT_ENABLED
|
|
else
|
|
EASTL_FAIL_MSG("intrusive_list::pop_front(): empty list.");
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
|
|
inline void intrusive_list_base::pop_back()
|
|
{
|
|
#if EASTL_VALIDATE_INTRUSIVE_LIST
|
|
intrusive_list_node* const pNode = mAnchor.mpPrev;
|
|
#endif
|
|
|
|
mAnchor.mpPrev->mpPrev->mpNext = &mAnchor;
|
|
mAnchor.mpPrev = mAnchor.mpPrev->mpPrev;
|
|
|
|
#if EASTL_VALIDATE_INTRUSIVE_LIST
|
|
if(pNode != &mAnchor)
|
|
pNode->mpNext = pNode->mpPrev = NULL;
|
|
#if EASTL_ASSERT_ENABLED
|
|
else
|
|
EASTL_FAIL_MSG("intrusive_list::pop_back(): empty list.");
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////
|
|
// intrusive_list
|
|
///////////////////////////////////////////////////////////////////////
|
|
|
|
template <typename T>
|
|
inline intrusive_list<T>::intrusive_list()
|
|
{
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline intrusive_list<T>::intrusive_list(const this_type& /*x*/)
|
|
: intrusive_list_base()
|
|
{
|
|
// We intentionally ignore argument x.
|
|
// To consider: Shouldn't this function simply not exist? Is there a useful purpose for having this function?
|
|
// There should be a comment here about it, though my first guess is that this exists to quell VC++ level 4/-Wall compiler warnings.
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::this_type& intrusive_list<T>::operator=(const this_type& /*x*/)
|
|
{
|
|
// We intentionally ignore argument x.
|
|
// See notes above in the copy constructor about questioning the existence of this function.
|
|
return *this;
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::iterator intrusive_list<T>::begin() noexcept
|
|
{
|
|
return iterator(static_cast<T*>(mAnchor.mpNext));
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::const_iterator intrusive_list<T>::begin() const noexcept
|
|
{
|
|
return const_iterator(static_cast<T*>(mAnchor.mpNext));
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::const_iterator intrusive_list<T>::cbegin() const noexcept
|
|
{
|
|
return const_iterator(static_cast<T*>(mAnchor.mpNext));
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::iterator intrusive_list<T>::end() noexcept
|
|
{
|
|
return iterator(static_cast<T*>(&mAnchor));
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::const_iterator intrusive_list<T>::end() const noexcept
|
|
{
|
|
return const_iterator(static_cast<const T*>(&mAnchor));
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::const_iterator intrusive_list<T>::cend() const noexcept
|
|
{
|
|
return const_iterator(static_cast<const T*>(&mAnchor));
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::reverse_iterator intrusive_list<T>::rbegin() noexcept
|
|
{
|
|
return reverse_iterator(iterator(static_cast<T*>(&mAnchor)));
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::const_reverse_iterator intrusive_list<T>::rbegin() const noexcept
|
|
{
|
|
return const_reverse_iterator(const_iterator(static_cast<const T*>(&mAnchor)));
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::const_reverse_iterator intrusive_list<T>::crbegin() const noexcept
|
|
{
|
|
return const_reverse_iterator(const_iterator(static_cast<const T*>(&mAnchor)));
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::reverse_iterator intrusive_list<T>::rend() noexcept
|
|
{
|
|
return reverse_iterator(iterator(static_cast<T*>(mAnchor.mpNext)));
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::const_reverse_iterator intrusive_list<T>::rend() const noexcept
|
|
{
|
|
return const_reverse_iterator(const_iterator(static_cast<const T*>(mAnchor.mpNext)));
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::const_reverse_iterator intrusive_list<T>::crend() const noexcept
|
|
{
|
|
return const_reverse_iterator(const_iterator(static_cast<const T*>(mAnchor.mpNext)));
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::reference intrusive_list<T>::front()
|
|
{
|
|
#if EASTL_VALIDATE_INTRUSIVE_LIST && EASTL_ASSERT_ENABLED
|
|
if(mAnchor.mpNext == &mAnchor)
|
|
EASTL_FAIL_MSG("intrusive_list::front(): empty list.");
|
|
#endif
|
|
|
|
return *static_cast<T*>(mAnchor.mpNext);
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::const_reference intrusive_list<T>::front() const
|
|
{
|
|
#if EASTL_VALIDATE_INTRUSIVE_LIST && EASTL_ASSERT_ENABLED
|
|
if(mAnchor.mpNext == &mAnchor)
|
|
EASTL_FAIL_MSG("intrusive_list::front(): empty list.");
|
|
#endif
|
|
|
|
return *static_cast<const T*>(mAnchor.mpNext);
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::reference intrusive_list<T>::back()
|
|
{
|
|
#if EASTL_VALIDATE_INTRUSIVE_LIST && EASTL_ASSERT_ENABLED
|
|
if(mAnchor.mpNext == &mAnchor)
|
|
EASTL_FAIL_MSG("intrusive_list::back(): empty list.");
|
|
#endif
|
|
|
|
return *static_cast<T*>(mAnchor.mpPrev);
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::const_reference intrusive_list<T>::back() const
|
|
{
|
|
#if EASTL_VALIDATE_INTRUSIVE_LIST && EASTL_ASSERT_ENABLED
|
|
if(mAnchor.mpNext == &mAnchor)
|
|
EASTL_FAIL_MSG("intrusive_list::back(): empty list.");
|
|
#endif
|
|
|
|
return *static_cast<const T*>(mAnchor.mpPrev);
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline void intrusive_list<T>::push_front(value_type& x)
|
|
{
|
|
#if EASTL_VALIDATE_INTRUSIVE_LIST && EASTL_ASSERT_ENABLED
|
|
if(x.mpNext || x.mpPrev)
|
|
EASTL_FAIL_MSG("intrusive_list::push_front(): element already on a list.");
|
|
#endif
|
|
|
|
x.mpNext = mAnchor.mpNext;
|
|
x.mpPrev = &mAnchor;
|
|
mAnchor.mpNext = &x;
|
|
x.mpNext->mpPrev = &x;
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline void intrusive_list<T>::push_back(value_type& x)
|
|
{
|
|
#if EASTL_VALIDATE_INTRUSIVE_LIST && EASTL_ASSERT_ENABLED
|
|
if(x.mpNext || x.mpPrev)
|
|
EASTL_FAIL_MSG("intrusive_list::push_back(): element already on a list.");
|
|
#endif
|
|
|
|
x.mpPrev = mAnchor.mpPrev;
|
|
x.mpNext = &mAnchor;
|
|
mAnchor.mpPrev = &x;
|
|
x.mpPrev->mpNext = &x;
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline bool intrusive_list<T>::contains(const value_type& x) const
|
|
{
|
|
for(const intrusive_list_node* p = mAnchor.mpNext; p != &mAnchor; p = p->mpNext)
|
|
{
|
|
if(p == &x)
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::iterator intrusive_list<T>::locate(value_type& x)
|
|
{
|
|
for(intrusive_list_node* p = (T*)mAnchor.mpNext; p != &mAnchor; p = p->mpNext)
|
|
{
|
|
if(p == &x)
|
|
return iterator(static_cast<T*>(p));
|
|
}
|
|
|
|
return iterator((T*)&mAnchor);
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::const_iterator intrusive_list<T>::locate(const value_type& x) const
|
|
{
|
|
for(const intrusive_list_node* p = mAnchor.mpNext; p != &mAnchor; p = p->mpNext)
|
|
{
|
|
if(p == &x)
|
|
return const_iterator(static_cast<const T*>(p));
|
|
}
|
|
|
|
return const_iterator((T*)&mAnchor);
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::iterator intrusive_list<T>::insert(const_iterator pos, value_type& x)
|
|
{
|
|
#if EASTL_VALIDATE_INTRUSIVE_LIST && EASTL_ASSERT_ENABLED
|
|
if(x.mpNext || x.mpPrev)
|
|
EASTL_FAIL_MSG("intrusive_list::insert(): element already on a list.");
|
|
#endif
|
|
|
|
intrusive_list_node& next = *const_cast<node_type*>(pos.mpNode);
|
|
intrusive_list_node& prev = *static_cast<node_type*>(next.mpPrev);
|
|
prev.mpNext = next.mpPrev = &x;
|
|
x.mpPrev = &prev;
|
|
x.mpNext = &next;
|
|
|
|
return iterator(&x);
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::iterator
|
|
intrusive_list<T>::erase(const_iterator pos)
|
|
{
|
|
intrusive_list_node& prev = *static_cast<node_type*>(pos.mpNode->mpPrev);
|
|
intrusive_list_node& next = *static_cast<node_type*>(pos.mpNode->mpNext);
|
|
prev.mpNext = &next;
|
|
next.mpPrev = &prev;
|
|
|
|
#if EASTL_VALIDATE_INTRUSIVE_LIST
|
|
iterator ii(const_cast<node_type*>(pos.mpNode));
|
|
ii.mpNode->mpPrev = ii.mpNode->mpNext = NULL;
|
|
#endif
|
|
|
|
return iterator(static_cast<node_type*>(&next));
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::iterator
|
|
intrusive_list<T>::erase(const_iterator first, const_iterator last)
|
|
{
|
|
intrusive_list_node& prev = *static_cast<node_type*>(first.mpNode->mpPrev);
|
|
intrusive_list_node& next = *const_cast<node_type*>(last.mpNode);
|
|
|
|
#if EASTL_VALIDATE_INTRUSIVE_LIST
|
|
// need to clear out all the next/prev pointers in the elements;
|
|
// this makes this operation O(n) instead of O(1), sadly, although
|
|
// it's technically amortized O(1) since you could count yourself
|
|
// as paying this cost with each insert.
|
|
intrusive_list_node* pCur = const_cast<node_type*>(first.mpNode);
|
|
|
|
while(pCur != &next)
|
|
{
|
|
intrusive_list_node* const pCurNext = pCur->mpNext;
|
|
pCur->mpPrev = pCur->mpNext = NULL;
|
|
pCur = pCurNext;
|
|
}
|
|
#endif
|
|
|
|
prev.mpNext = &next;
|
|
next.mpPrev = &prev;
|
|
|
|
return iterator(const_cast<node_type*>(last.mpNode));
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::reverse_iterator
|
|
intrusive_list<T>::erase(const_reverse_iterator position)
|
|
{
|
|
return reverse_iterator(erase((++position).base()));
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline typename intrusive_list<T>::reverse_iterator
|
|
intrusive_list<T>::erase(const_reverse_iterator first, const_reverse_iterator last)
|
|
{
|
|
// Version which erases in order from first to last.
|
|
// difference_type i(first.base() - last.base());
|
|
// while(i--)
|
|
// first = erase(first);
|
|
// return first;
|
|
|
|
// Version which erases in order from last to first, but is slightly more efficient:
|
|
return reverse_iterator(erase((++last).base(), (++first).base()));
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
void intrusive_list<T>::swap(intrusive_list& x)
|
|
{
|
|
// swap anchors
|
|
intrusive_list_node temp(mAnchor);
|
|
mAnchor = x.mAnchor;
|
|
x.mAnchor = temp;
|
|
|
|
// Fixup node pointers into the anchor, since the addresses of
|
|
// the anchors must stay the same with each list.
|
|
if(mAnchor.mpNext == &x.mAnchor)
|
|
mAnchor.mpNext = mAnchor.mpPrev = &mAnchor;
|
|
else
|
|
mAnchor.mpNext->mpPrev = mAnchor.mpPrev->mpNext = &mAnchor;
|
|
|
|
if(x.mAnchor.mpNext == &mAnchor)
|
|
x.mAnchor.mpNext = x.mAnchor.mpPrev = &x.mAnchor;
|
|
else
|
|
x.mAnchor.mpNext->mpPrev = x.mAnchor.mpPrev->mpNext = &x.mAnchor;
|
|
|
|
#if EASTL_VALIDATE_INTRUSIVE_LIST
|
|
temp.mpPrev = temp.mpNext = NULL;
|
|
#endif
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
void intrusive_list<T>::splice(const_iterator pos, value_type& value)
|
|
{
|
|
// Note that splice(pos, x, pos) and splice(pos+1, x, pos)
|
|
// are valid and need to be handled correctly.
|
|
|
|
if(pos.mpNode != &value)
|
|
{
|
|
// Unlink item from old list.
|
|
intrusive_list_node& oldNext = *value.mpNext;
|
|
intrusive_list_node& oldPrev = *value.mpPrev;
|
|
oldNext.mpPrev = &oldPrev;
|
|
oldPrev.mpNext = &oldNext;
|
|
|
|
// Relink item into new list.
|
|
intrusive_list_node& newNext = *const_cast<node_type*>(pos.mpNode);
|
|
intrusive_list_node& newPrev = *newNext.mpPrev;
|
|
|
|
newPrev.mpNext = &value;
|
|
newNext.mpPrev = &value;
|
|
value.mpPrev = &newPrev;
|
|
value.mpNext = &newNext;
|
|
}
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
void intrusive_list<T>::splice(const_iterator pos, intrusive_list& x)
|
|
{
|
|
// Note: &x == this is prohibited, so self-insertion is not a problem.
|
|
if(x.mAnchor.mpNext != &x.mAnchor) // If the list 'x' isn't empty...
|
|
{
|
|
intrusive_list_node& next = *const_cast<node_type*>(pos.mpNode);
|
|
intrusive_list_node& prev = *static_cast<node_type*>(next.mpPrev);
|
|
intrusive_list_node& insertPrev = *static_cast<node_type*>(x.mAnchor.mpNext);
|
|
intrusive_list_node& insertNext = *static_cast<node_type*>(x.mAnchor.mpPrev);
|
|
|
|
prev.mpNext = &insertPrev;
|
|
insertPrev.mpPrev = &prev;
|
|
insertNext.mpNext = &next;
|
|
next.mpPrev = &insertNext;
|
|
x.mAnchor.mpPrev = x.mAnchor.mpNext = &x.mAnchor;
|
|
}
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
void intrusive_list<T>::splice(const_iterator pos, intrusive_list& /*x*/, const_iterator i)
|
|
{
|
|
// Note: &x == this is prohibited, so self-insertion is not a problem.
|
|
|
|
// Note that splice(pos, x, pos) and splice(pos + 1, x, pos)
|
|
// are valid and need to be handled correctly.
|
|
|
|
// We don't need to check if the source list is empty, because
|
|
// this function expects a valid iterator from the source list,
|
|
// and thus the list cannot be empty in such a situation.
|
|
|
|
iterator ii(const_cast<node_type*>(i.mpNode)); // Make a temporary non-const version.
|
|
|
|
if(pos != ii)
|
|
{
|
|
// Unlink item from old list.
|
|
intrusive_list_node& oldNext = *ii.mpNode->mpNext;
|
|
intrusive_list_node& oldPrev = *ii.mpNode->mpPrev;
|
|
oldNext.mpPrev = &oldPrev;
|
|
oldPrev.mpNext = &oldNext;
|
|
|
|
// Relink item into new list.
|
|
intrusive_list_node& newNext = *const_cast<node_type*>(pos.mpNode);
|
|
intrusive_list_node& newPrev = *newNext.mpPrev;
|
|
|
|
newPrev.mpNext = ii.mpNode;
|
|
newNext.mpPrev = ii.mpNode;
|
|
ii.mpNode->mpPrev = &newPrev;
|
|
ii.mpNode->mpNext = &newNext;
|
|
}
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
void intrusive_list<T>::splice(const_iterator pos, intrusive_list& /*x*/, const_iterator first, const_iterator last)
|
|
{
|
|
// Note: &x == this is prohibited, so self-insertion is not a problem.
|
|
if(first != last)
|
|
{
|
|
intrusive_list_node& insertPrev = *const_cast<node_type*>(first.mpNode);
|
|
intrusive_list_node& insertNext = *static_cast<node_type*>(last.mpNode->mpPrev);
|
|
|
|
// remove from old list
|
|
insertNext.mpNext->mpPrev = insertPrev.mpPrev;
|
|
insertPrev.mpPrev->mpNext = insertNext.mpNext;
|
|
|
|
// insert into this list
|
|
intrusive_list_node& next = *const_cast<node_type*>(pos.mpNode);
|
|
intrusive_list_node& prev = *static_cast<node_type*>(next.mpPrev);
|
|
|
|
prev.mpNext = &insertPrev;
|
|
insertPrev.mpPrev = &prev;
|
|
insertNext.mpNext = &next;
|
|
next.mpPrev = &insertNext;
|
|
}
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
inline void intrusive_list<T>::remove(value_type& value)
|
|
{
|
|
intrusive_list_node& prev = *value.mpPrev;
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intrusive_list_node& next = *value.mpNext;
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prev.mpNext = &next;
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next.mpPrev = &prev;
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#if EASTL_VALIDATE_INTRUSIVE_LIST
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value.mpPrev = value.mpNext = NULL;
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#endif
|
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}
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template <typename T>
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void intrusive_list<T>::merge(this_type& x)
|
|
{
|
|
if(this != &x)
|
|
{
|
|
iterator first(begin());
|
|
iterator firstX(x.begin());
|
|
const iterator last(end());
|
|
const iterator lastX(x.end());
|
|
|
|
while((first != last) && (firstX != lastX))
|
|
{
|
|
if(*firstX < *first)
|
|
{
|
|
iterator next(firstX);
|
|
|
|
splice(first, x, firstX, ++next);
|
|
firstX = next;
|
|
}
|
|
else
|
|
++first;
|
|
}
|
|
|
|
if(firstX != lastX)
|
|
splice(last, x, firstX, lastX);
|
|
}
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
template <typename Compare>
|
|
void intrusive_list<T>::merge(this_type& x, Compare compare)
|
|
{
|
|
if(this != &x)
|
|
{
|
|
iterator first(begin());
|
|
iterator firstX(x.begin());
|
|
const iterator last(end());
|
|
const iterator lastX(x.end());
|
|
|
|
while((first != last) && (firstX != lastX))
|
|
{
|
|
if(compare(*firstX, *first))
|
|
{
|
|
iterator next(firstX);
|
|
|
|
splice(first, x, firstX, ++next);
|
|
firstX = next;
|
|
}
|
|
else
|
|
++first;
|
|
}
|
|
|
|
if(firstX != lastX)
|
|
splice(last, x, firstX, lastX);
|
|
}
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
void intrusive_list<T>::unique()
|
|
{
|
|
iterator first(begin());
|
|
const iterator last(end());
|
|
|
|
if(first != last)
|
|
{
|
|
iterator next(first);
|
|
|
|
while(++next != last)
|
|
{
|
|
if(*first == *next)
|
|
erase(next);
|
|
else
|
|
first = next;
|
|
next = first;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
template <typename BinaryPredicate>
|
|
void intrusive_list<T>::unique(BinaryPredicate predicate)
|
|
{
|
|
iterator first(begin());
|
|
const iterator last(end());
|
|
|
|
if(first != last)
|
|
{
|
|
iterator next(first);
|
|
|
|
while(++next != last)
|
|
{
|
|
if(predicate(*first, *next))
|
|
erase(next);
|
|
else
|
|
first = next;
|
|
next = first;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////
|
|
// global operators
|
|
///////////////////////////////////////////////////////////////////////
|
|
|
|
template <typename T>
|
|
bool operator==(const intrusive_list<T>& a, const intrusive_list<T>& b)
|
|
{
|
|
// If we store an mSize member for intrusive_list, we want to take advantage of it here.
|
|
typename intrusive_list<T>::const_iterator ia = a.begin();
|
|
typename intrusive_list<T>::const_iterator ib = b.begin();
|
|
typename intrusive_list<T>::const_iterator enda = a.end();
|
|
typename intrusive_list<T>::const_iterator endb = b.end();
|
|
|
|
while((ia != enda) && (ib != endb) && (*ia == *ib))
|
|
{
|
|
++ia;
|
|
++ib;
|
|
}
|
|
return (ia == enda) && (ib == endb);
|
|
}
|
|
|
|
template <typename T>
|
|
void swap(intrusive_list<T>& a, intrusive_list<T>& b)
|
|
{
|
|
a.swap(b);
|
|
}
|
|
|
|
|
|
} // namespace eastl
|
|
|
|
|
|
#endif // Header include guard
|
|
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