C++ priority_queue empty()

C++ priority_queue empty() function is used to check whether the priority_queue container is empty or not. If priority_queue is empty, it returns true otherwise false.

Syntax

Consider priority_queue 'pq' as a priority_queue object.

Parameter

It does not take any parameter.

Return value

Null

Example 1

#include <iostream>
#include <queue>
using namespace std;
int main()
{
  priority_queue<char> mp;
mp.push('a');
mp.push('b');
mp.push('c');
if(mp.empty())
{
cout<< "true";
}
else
{
cout<< "false";
}
return 0;
}

Output:

false

Example 2

#include <iostream>
#include <queue>
using namespace std;
int main()
{
 priority_queue<int> mp;
 priority_queue<int> mp1;
mp.push(1);
mp.push(2);
if(mp.empty())
{
cout<< "true";
}
else
{
cout<< "false \n";
}
if(mp1.empty())
{
cout<< "true";
}
else
{
cout<< "false";
}
return 0;
}

Output:

false
true

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