table of contents
std::priority_queue::push(3) | C++ Standard Libary | std::priority_queue::push(3) |
NAME¶
std::priority_queue::push - std::priority_queue::push
Synopsis¶
void push( const value_type& value );
void push( value_type&& value ); (since C++11)
Pushes the given element value to the priority queue.
1) Effectively calls c.push_back(value); std::push_heap(c.begin(), c.end(),
comp);.
2) Effectively calls c.push_back(std::move(value)); std::push_heap(c.begin(),
c.end(), comp);.
Parameters¶
value - the value of the element to push
Return value¶
(none)
Complexity¶
Logarithmic number of comparisons plus the complexity of Container::push_back.
Example¶
// Run this code
#include <iostream>
#include <queue>
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:\t";
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 << "\nProcess events:\t\t";
for (; !events.empty(); events.pop())
{
Event const& e = events.top();
std::cout << e << ' ';
}
std::cout << '\n';
}
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 constructs element in-place and sorts the underlying
container
(C++11) (public member function)
pop removes the top element
(public member function)
2024.06.10 | http://cppreference.com |