std::priority_queue<T,Container,Compare>::pop

 

C++

Compiler support

Freestanding and hosted

Language

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Technical specifications

Symbols index

External libraries

 

Containers library

Sequence

array (C++11)

vector

deque

forward_list (C++11)

list

Associative

set

multiset

map

multimap

Unordered associative

unordered_set (C++11)

unordered_multiset (C++11)

unordered_map (C++11)

unordered_multimap (C++11)

Adaptors

stack

queue

priority_queue

Views

span (C++20)

 

std::priority_queue

Member functions

priority_queue::priority_queue

priority_queue::~priority_queue

priority_queue::operator=

Element access

priority_queue::top

Capacity

priority_queue::empty

priority_queue::size

Modifiers

priority_queue::push

priority_queue::emplace (C++11)

priority_queue::pop

priority_queue::swap (C++11)

Non-member functions

std::swap (C++11)

Deduction guides(C++17)

 

void pop();

Removes the top element from the priority queue. Effectively calls std::pop_heap(c.begin(), c.end(), comp); c.pop_back();

Parameters

(none)

Return value

(none)

Complexity

Logarithmic number of comparisons plus the complexity of Container::pop_back.

Example

Run this code

#include <queue>
#include <iostream>
 
struct Event
{
    int priority{};
    char data{' '};
 
    friend bool operator< (Event const& lhs, Event const& rhs) {
        return lhs.priority < rhs.priority;
    }
 
    friend std::ostream& operator<< (std::ostream& os, Event const& e) {
        return os << "{ " << e.priority << ", '" << e.data << "' } ";
    }
};
 
int main()
{
    std::priority_queue<Event> events;
 
    std::cout << "Fill the events queue:\n";
 
    for (auto const e: { Event{6,'L'}, {8,'I'}, {9,'S'}, {1,'T'}, {5,'E'}, {3,'N'} }) {
        std::cout << e << ' ';
        events.push(e);
    }
 
    std::cout << "\n" "Process events:\n";
 
    for (; !events.empty(); events.pop()) {
        Event const& e = events.top();
        std::cout << e << ' ';
    }
}

Output:

Fill the events queue:
{ 6, 'L' }  { 8, 'I' }  { 9, 'S' }  { 1, 'T' }  { 5, 'E' }  { 3, 'N' }
Process events:
{ 9, 'S' }  { 8, 'I' }  { 6, 'L' }  { 5, 'E' }  { 3, 'N' }  { 1, 'T' }

See also

emplace (C++11)	constructs element in-place and sorts the underlying container (public member function)
push	inserts element and sorts the underlying container (public member function)
top	accesses the top element (public member function)