mirror of https://github.com/AxioDL/boo.git
80 lines
1.9 KiB
C++
80 lines
1.9 KiB
C++
#pragma once
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#include "boo/BooObject.hpp"
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#include <iterator>
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namespace boo
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{
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/** Linked-list iterator shareable by ListNode types. */
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template <class T>
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class ListIterator
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{
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T* m_node;
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public:
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using iterator_category = std::bidirectional_iterator_tag;
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using value_type = T;
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using difference_type = std::ptrdiff_t;
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using pointer = T*;
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using reference = T&;
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explicit ListIterator(T* node) : m_node(node) {}
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T& operator*() const { return *m_node; }
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bool operator!=(const ListIterator& other) const { return m_node != other.m_node; }
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ListIterator& operator++() { m_node = m_node->m_next; return *this; }
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ListIterator& operator--() { m_node = m_node->m_prev; return *this; }
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};
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/** Linked-list IObj node made part of objects participating in list.
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* Subclasses must implement static methods _getHeadPtr() and _getHeadLock()
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* to support the common list-management functionality.
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*/
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template <class N, class H, class P = IObj>
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struct ListNode : P
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{
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using iterator = ListIterator<N>;
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iterator begin() { return iterator(static_cast<N*>(this)); }
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iterator end() { return iterator(nullptr); }
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H m_head;
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N* m_next;
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N* m_prev = nullptr;
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ListNode(H head) : m_head(head)
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{
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auto lk = N::_getHeadLock(head);
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m_next = N::_getHeadPtr(head);
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if (m_next)
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m_next->m_prev = static_cast<N*>(this);
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N::_getHeadPtr(head) = static_cast<N*>(this);
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}
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protected:
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~ListNode()
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{
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if (m_prev)
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{
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if (m_next)
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m_next->m_prev = m_prev;
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m_prev->m_next = m_next;
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}
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else
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{
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if (m_next)
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m_next->m_prev = nullptr;
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N::_getHeadPtr(m_head) = m_next;
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}
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}
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};
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static inline uint32_t flp2(uint32_t x)
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{
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x = x | (x >> 1);
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x = x | (x >> 2);
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x = x | (x >> 4);
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x = x | (x >> 8);
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x = x | (x >> 16);
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return x - (x >> 1);
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}
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}
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