37 lines
904 B
C++
37 lines
904 B
C++
#pragma once
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#include <queue>
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#include <stdexcept>
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#include <vector>
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#include "WorkItem.h"
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struct WorkItemComparator {
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bool operator()(const WorkItem& a, const WorkItem& b) const {
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return a.priority < b.priority; // max-heap: higher priority first
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}
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};
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class PriorityQueue {
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public:
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void enqueue(WorkItem item) {
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heap_.push(std::move(item));
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}
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WorkItem dequeue() {
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if (heap_.empty()) throw std::underflow_error("queue is empty");
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WorkItem top = heap_.top();
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heap_.pop();
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return top;
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}
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const WorkItem& peek() const {
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if (heap_.empty()) throw std::underflow_error("queue is empty");
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return heap_.top();
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}
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std::size_t size() const { return heap_.size(); }
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bool empty() const { return heap_.empty(); }
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private:
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std::priority_queue<WorkItem, std::vector<WorkItem>, WorkItemComparator> heap_;
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};
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