code: @Throws(IllegalPositionIndexException.class)
  	public static void positionIndex(final boolean condition, final int index, final int size) {
  		if (condition) {
  			Check.positionIndex(index, size);
  		}
  	}
docs: Ensures that a given position index is valid within the size of an array, list or string ...
  
  @param condition
  condition must be {@code true}^ so that the check will be performed
  @param index
  index of an array, list or string
  @param size
  size of an array list or string
  
  @throws IllegalPositionIndexException
  if the index is not a valid position index within an array, list or string of size <em>size</em>