Hello, Accumulator features can be marked as droppable so that at runtime, one could drop some calculations from being performed. Is there some way to add features at runtime. I need to do something like this in a generic method. The caller will provide me the calculations they would want to perform in a bitwise ORed format. Based on that, I need to create an accumulator_set object in my constructor. The accumulator_set object will be a member of my class. A crude way I can think of is to add all features that I intend to support and drop them based on user input. Is there a better way of doing it, is this not an optimal way to do it? Looking forward for your feedback. // Some pseudo code to show my intentions class calcstat { public: void SetCalc(int type) { // I want to add features here based on user input } void compute(void) { // If I cannot add based on user input, I will drop based on // user input. I will then not be able to add if the user input // changes. For now, I am not interested in its reuse! } private: accumulator_set<double> m_acc; }; -dhruva -- Contents reflect my personal views only!