C++ queue - operator== Function
The C++ queue operator== function is used to check whether two queues are equal or not. It returns true if two queues are equal, else returns false.
Syntax
template <class T, class Container> bool operator== (const queue<T,Container>& lhs, const queue<T,Container>& rhs);
template <class T, class Container> bool operator== (const queue<T,Container>& lhs, const queue<T,Container>& rhs);
Parameters
lhs |
First queue. |
rhs |
Second queue. |
Return Value
Returns true if the contents of lhs are equal to the contents of rhs, else returns false.
Time Complexity
Linear i.e, Θ(n).
Example:
In the example below, the operator== function is used to check whether two queues are equal or not.
#include <iostream>
#include <queue>
using namespace std;
int main (){
queue<int> q1;
queue<int> q2;
for(int i = 0; i<3; i++) {
q1.push(i);
q2.push(i);
}
if (q1 == q2)
cout<<"q1 and q2 are equal.\n";
else
cout<<"q1 and q2 are not equal.\n";
q1.pop();
cout<<"\nAfter deleting first element of q1.\n";
if (q1 == q2)
cout<<"q1 and q2 are equal.\n";
else
cout<<"q1 and q2 are not equal.\n";
return 0;
}
The output of the above code will be:
q1 and q2 are equal. After deleting first element of q1. q1 and q2 are not equal.
❮ C++ <queue> Library
