标签:return ble containe vector name 并且 whether and enc
优先级队列(priority_queue)是一种容器适配器(container adaptor)。它要求容器具有front、push_back、pop_back等操作,并且容器具有随机访问的能力,故优先队列可以基于vector或者deque构造。
queue和prioruty_queue都被定义在queue头文件中。
几种定义形式:
using namespace std; int myint[4] = {10, 60, 50, 20}; priority_queue<int> first; //创建一个空的优先队列 priority_queue<int> second(myint, myint+4); //second包含四个int,其中60在队列的顶部(默认是越小的优先级越低,所以最大的60在top priority_queue<int, vector<int>, greater<int> > third(myint, myint+4); //third同样包含四个int,但是它的优先级是越大优先级越低,所以最小的10在top
也可以自定义比较优先级,其操作为:
//定义比较的类或结构体,并重载()运算符 class mycmp { bool reverse; public: mycmp(const bool& revparam=false){reverse = revparam;} bool operator()(const int& lhs, const int& rhs) const { if(reverse) return (lhs > rhs); else return (lhs < rhs); } //使用自己定义的比较优先级 typedef priority_queue<int, vector<int>, mycmp> mypq_type; mypq_type fourth; mypq_type fifth(mycmp(true));
成员函数有:
empty | Test whether container is empty |
size | Return size |
top | Access top element |
push | Insert element |
emplace | Construct and insert element |
pop | Remove top element |
swap | Swap contents |
再添加一个博客链接,讲得比较详细:https://blog.csdn.net/c20182030/article/details/70757660
标签:return ble containe vector name 并且 whether and enc
原文地址:https://www.cnblogs.com/patrolli/p/11235123.html