priority_queue<pair<int,int>,vector<pair<int,int>>, MyComparator> minHeap(MyComparator(arrays)); 在这里,编译器无法确定这是函数签名还是构造函数的调用。摆脱这种歧义的通常方法是添加一对额外的括号: priority_queue<pair<int,int>,vector<pair<int,int>>, MyComparator> minHeap((MyComparator(arrays))); 好奇的答案也是正确的,但是使用括号进行...
In this article, we are going to see how to write yourcomparator function for priority queue in C++ STLusing thelambda function. This is going to help you certainly to use priority queue more widely when you may have skipped thinking about how you can create a priority queue of your data ...
I am having problem writing a custom comparator for priority queue in C++. The elements' type in the queue ispair<long long,pair<long long, long long>>I want the queue to rank the elements with the smallestfirstelement first, and if there is a tie, rank the elements with the smallests...
4142template<class_Iter>43priority_queue(_Iter _First, _Iter _Last,const_Pr &_Pred)44: c(_First, _Last), comp(_Pred)45{46//construct by copying [_First, _Last), specified comparator47make_heap(c.begin(), c.end(), comp);48}4950template<class_Iter>51priority_queue(_Iter _First, ...
}template<class_Iter>priority_queue(_Iter _First, _Iter _Last,const_Pr &_Pred,const_Container &_Cont): c(_Cont), comp(_Pred) {// construct by copying [_First, _Last), container, and comparatorc.insert(c.end(), _First, _Last);make_heap(c.begin(), c.end(), comp); ...
如图PriorityBlockingQueue内部有个数组queue用来存放队列元素,size用来存放队列元素个数,allocationSpinLockOffset是用来在扩容队列时候做cas的,目的是保证只有一个线程可以进行扩容。 由于这是一个优先级队列所以有个比较器comparator用来比较元素大小。lock独占锁对象用来控制同时只能有一个线程可以进行入队出队操作。notEmpty...
super E> comparator)再者里面有一个 grow 函数，就是当初始化空间不足容纳新插入的元素时候，就会进行...
PriorityBlockingQueue通过以下两种方式实现元素优先级排序: 入队元素实现Comparable接口来比较元素优先级; PriorityBlockingQueue构造函数指定Comparator来比较元素优先级; 关于PriorityBlockingQueue中队列操作的部分,基本和PriorityQueue逻辑一致,只不过在操作时加锁了。在本文中我们主要关注PriorityBlockingQueue出队的take方法,该...
PriorityBlockingQueue是一个支持优先级的无界阻塞队列。默认情况下元素采用自然顺序升序排序,当然我们也可以通过构造函数来指定Comparator来对元素进行排序。需要注意的是PriorityBlockingQueue不能保证同优先级元素的顺序。 二叉堆 由于PriorityBlockingQueue底层采用二叉堆来实现的,所以有必要先介绍下二叉堆。
priority_queue() : c(), comp() { // construct with empty container, default comparator } explicit priority_queue(const _Pr&_Pred) : c(), comp(_Pred) { // construct with empty container, specified comparator } priority_queue(const _Pr& _Pred, const_Container& _Cont) : c(_Cont), ...