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× C++ Standard Library C++ STL Library


The C++ deque::operator!= function is used to check whether two deques are unequal or not. It returns true if two deques are not equal, else returns false. deque::operator!= compares elements of deques sequentially and stops comparison after first mismatch.

Syntax

template <class T, class Alloc>
bool operator!= (const deque<T,Alloc>& lhs, const deque<T,Alloc>& rhs);
template <class T, class Alloc>
bool operator!= (const deque<T,Alloc>& lhs, const deque<T,Alloc>& rhs);

Parameters

lhs First deque.
rhs Second deque.

Return Value

Returns true if the contents of lhs are not equal to the contents of rhs, else returns false.

Time Complexity

Linear i.e, Θ(n).

Example:

In the below example, the deque::operator!= function is used to check whether two deques are unequal or not.

#include <iostream>
#include <deque>
using namespace std;
 
int main (){
  deque<int> dq1 {10, 20, 30};
  deque<int> dq2 {10, 20, 30};
  deque<int> dq3 {10, 20};

  if (dq1 != dq2)
    cout<<"dq1 and dq2 are not equal.\n";
  else
    cout<<"dq1 and dq2 are equal.\n";

  if (dq1 != dq3)
    cout<<"dq1 and dq3 are not equal.\n";
  else
    cout<<"dq1 and dq3 are equal.\n";
    
  return 0;
}

The output of the above code will be:

dq1 and dq2 are equal.
dq1 and dq3 are not equal.

❮ C++ <deque> Library