Wil the performace be improved if I use only pass by reference for all functions in C++? If so, how much will it be? : <p><strong>Since passing by reference is devoid of the copying process</strong>, if I use <strong>only</strong> pass by reference (when satisfying the situation) for <strong>all functions</strong>, will the performance be improved? (that makes difference)</p>

<p>(As far as I learned in Cpp programming, passing by value means copying the value and pass it into the function, while passing by reference means creating another "placeholder" or "name" for the variable without copying the value.)</p>
