title: Optimization where the output has constraints
body: <p>I am working on solving a black box optimization problem where the constraints are applicable on the outcome. Example, my function is pertaining to cost and min customer demand % is the constraint applicable as an constraint on cost.</p>
  <p>The issue here is not knowing the internals of function which does not allow me to constrain my decision variables.</p>
  <p>Is there a way to implement this using Evolutionary optimizers (Genetic Algo)?
  Thanks in advance!</p>