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operator== (<queue>)

Tests if the queue object on the left side of the operator is equal to queue object on the right side.

bool operator==( 
   const queue <Type, Container>& _Left, 
   const queue <Type, Container>& _Right, 
);

_Left

An object of type queue.

_Right

An object of type queue.

true if the queues are not equal; false if queues are equal.

The comparison between queue objects is based on a pairwise comparison of their elements. Two queues are equal if they have the same number of elements and their respective elements have the same values. Otherwise, they are unequal.

// queue_op_eq.cpp
// compile with: /EHsc
#include <queue>
#include <list>
#include <iostream>

int main( )
{
   using namespace std;

   // Declares queues with list base containers
   queue <int, list<int> > q1, q2, q3;

   // The following line would have caused an error because vector 
   // does not support pop_front( ) and so cannot be adapted
   // by queue as a base container
   // queue <int, vector<int> > q1, q2, q3;

   q1.push( 1 );
   q2.push( 2 );
   q3.push( 1 );

   if ( q1 != q2 )
      cout << "The queues q1 and q2 are not equal." << endl;
   else
      cout << "The queues q1 and q2 are equal." << endl;


   if ( q1 != q3 )
      cout << "The queues q1 and q3 are not equal." << endl;
   else
      cout << "The queues q1 and q3 are equal." << endl;
}
The queues q1 and q2 are not equal.
The queues q1 and q3 are equal.

Header: <queue>

Namespace: std

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