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queue.h
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queue.h
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//---------------------------------------------------------------------------
#pragma once
#include "malloc_allocate.h"
//---------------------------------------------------------------------------
template <typename T> struct QueueEntry : public JavelinMallocAllocate {
QueueEntry *next;
T data;
using JavelinMallocAllocate::operator new;
using JavelinMallocAllocate::operator delete;
static void *operator new(size_t n, size_t extra) noexcept {
return operator new(n + extra);
}
static void operator delete(void *p, size_t extra) noexcept {
operator delete(p);
}
};
template <typename T> class Queue {
public:
Queue() : head(nullptr), tail(&head) {}
void AddEntry(QueueEntry<T> *entry) {
*tail = entry;
tail = &entry->next;
}
void RemoveHead() {
QueueEntry<T> *entry = head;
head = entry->next;
if (head == nullptr) {
tail = &head;
}
delete entry;
}
protected:
QueueEntry<T> *head;
QueueEntry<T> **tail;
};
//---------------------------------------------------------------------------
template <typename T> class CountedQueue : public Queue<T> {
public:
void AddEntry(QueueEntry<T> *entry) {
++count;
Queue<T>::AddEntry(entry);
}
void RemoveHead() {
--count;
Queue<T>::RemoveHead();
}
size_t GetCount() const { return count; }
private:
size_t count;
};
//---------------------------------------------------------------------------