C++: Fastest method to check if all array elements are equal

Question

What is the fastest method to check if all elements of an array(preferable integer array) are equal. Till now I have been using the following code:

bool chec         


        

Answer 1

int check(const int a[], int n)
{   
    while(--n>0 && a[n]==a[0]);
    return n!=0;
}