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142 regels
2.7 KiB
142 regels
2.7 KiB
#pragma once
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#include <stddef.h>
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#include "gp/algorithm/tmp_manip.hpp"
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#include "gp/algorithm/modifiers.hpp"
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#include "gp_config.hpp"
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namespace gp {
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template<typename T, typename allocator, bool copy_allocator = true>
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class ring_list{
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public:
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class explorer;
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class node {
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T* value;
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node* prev;
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node* next;
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public:
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node(T* p)
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: value{p}
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, prev{this}
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, next{this}
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{}
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friend class gp::ring_list<T, allocator, copy_allocator>::explorer;
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friend class gp::ring_list<T, allocator, copy_allocator>;
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};
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class explorer {
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node* pos;
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public:
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explorer(node* v)
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: pos{v}
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{}
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bool operator==(const explorer& oth) const {
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return pos == oth.pos;
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}
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bool operator!=(const explorer& oth) const {
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return pos != oth.pos;
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}
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explorer operator++() {
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pos = pos->next;
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return pos;
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}
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explorer operator++(int) {
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auto tmp = pos;
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pos = pos->next;
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return tmp;
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}
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explorer operator--() {
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pos = pos->prev;
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return pos;
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}
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explorer operator--(int) {
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auto tmp = pos;
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pos = pos->prev;
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return tmp;
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}
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T& operator*() {
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return *(pos->value);
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}
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friend class ring_list;
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};
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private:
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node* any_node;
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size_t sz;
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typename gp::either<
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copy_allocator,
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allocator,
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gp::reference_wrapper<allocator>
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>::type alloc;
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void stitch_around(node* n) {
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n->prev->next = n->next;
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n->next->prev = n->prev;
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}
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public:
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ring_list()
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: any_node{nullptr}
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, sz{0}
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, alloc{}
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{}
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ring_list(node* initial, allocator& _alloc)
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: any_node{initial}
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, sz{1}
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, alloc{_alloc}
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{}
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template<typename V = T, typename ...Args>
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bool insert(Args&&... elem) {
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allocator& used_allocator = alloc;
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void* mem = used_allocator.allocate(sizeof(V));
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T* p = new(mem) V(elem...);
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node* to_insert = nullptr;
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if(
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nullptr == (to_insert = reinterpret_cast<node*>(used_allocator.allocate(sizeof(node))))
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) return false;
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to_insert = new(to_insert) node(p);
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[[unlikely]] if (any_node == nullptr)
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{
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any_node = to_insert;
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} else {
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to_insert->prev = any_node->prev;
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to_insert->next = any_node;
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to_insert->prev->next = to_insert;
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any_node->prev = to_insert;
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}
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return true;
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}
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explorer explore() {
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return any_node;
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}
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void remove(explorer& value) {
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auto& v = *value;
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if(v == explore()) {
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if(v->next == v) {
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any_node = nullptr;
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} else {
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stitch_around(any_node);
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}
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} else {
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stitch_around(value.pos);
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}
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allocator& used_allocator = alloc;
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v.value->~T();
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gp_config::assertion(used_allocator.deallocate(v.value), "Bad free of value");
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value.pos->~node();
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gp_config::assertion(used_allocator.deallocate(value.pos), "Bad free of node");
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}
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};
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}
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