explicitpriority_queue(constCompare& compare =Compare(),constContainer& cont =Container() ); 可以看到,如果我们构造时,不指定特定的compare对象,那么就用typename Compare的默认构造函数构造一个,然而lambda表达式的匿名类型是没有默认构造函数的, 所以想要正确初始化这个优先队列,还得在构造函数里再把lambda表达式本...
_Compare – Comparison function object type, defaults to less<_Sequence::value_type>. This is not a true container, but an adaptor. It holds another container, and provides a wrapper interface to that container. The wrapper is what enforces priority-based sorting and %queue behavior. Very fe...
用于创建小顶堆 auto compareFunc = [](int a, int b) { return a > b; // 注意这里是大于号,因为我们要创建一个小顶堆 }; // 使用自定义比较函数创建priority_queue std::priority_queue<int, std::vector<int>, std::function<bool(int, int)>> pq(compareFunc); ...
The comparison function of typeconstTraitsused to order the elements in the priority_queue, which defaults to compare function of the base container. _Cont The base container of which the constructed priority_queue is to be a copy. _Right ...
struct compare { bool operator()(node l, node r) { ... } }; We use above struct in the priority queue to define custom compare function. Why () operator overloading works? Thanks in advance.. +3 ankit_gupta_ 6 years ago 0
priority_queue<Type, Container, Compare>:创建一个优先队列对象,其中Type是元素类型,Container是底层容器类型(默认为vector),Compare是元素比较的函数对象类型(默认为std::less,用于最大堆)。 priority_queue(first, last):使用范围为[first, last)的迭代器构造一个优先队列。
template<classT>classLess{public:booloperator()(constT&x,constT&y){returnx<y;}};template<classT,classContainer=vector<T>,classCompare=Less<T>>classpriority_queue{public:voidAdjustDown(int parent){int child=2*parent+1;while(child<_con.size()){if(child+1<_con.size()&&_com(_con[child],_...
// Get the comparison function inline Compare& cmp() { return cmp_; } inline const Compare& cmp() const { return cmp_; } protected: // Reorder the subtree containing elts_[index] void heapify_up(Int index) { debug_assert(index < size_); ...
Compare：一个用于比较元素的函数对象。返回true表示第一个参数应该排在第二个参数之后。默认为std::less...
vector<T>, typename Compare=less<T>> class priority_queue priority_queue 实例默认有一个 vector 容器。函数对象类型 less<T> 是一个默认的排序断言,定义在头文件 function 中(其中还定义了 greater<T>),决定了容器中最大的元素会排在队列前面。int main() {...