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std::priority_queue push() method

// (1) Non const version only
void push( const value_type& value );

// (2) Non const version only
void push( value_type&& value );

Pushes the given element value to the end of the priority queue.

  • (1) Effectively calls
    c.push_back(value);
    std::push_heap(c.begin(), c.end(), comp);
  • (1) 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 push_back of the underlying container.

Example

Main.cpp
#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' }

std::priority_queue push() method

// (1) Non const version only
void push( const value_type& value );

// (2) Non const version only
void push( value_type&& value );

Pushes the given element value to the end of the priority queue.

  • (1) Effectively calls
    c.push_back(value);
    std::push_heap(c.begin(), c.end(), comp);
  • (1) 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 push_back of the underlying container.

Example

Main.cpp
#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' }