I am having trouble understanding the class FunctionTime, under what 
circumstances it is need, and how it is implemented.

Consider Step-26 in the tutorial. There is no variable anywhere defined 
with class FunctionTime. However, the function get_time() is still used, 
seemingly to get the current value of the time variable. However, when I do 
similarly, it seems the the variable created in my BoundaryValues function 
is always zero. I am using the line:

const double time = this->get_time();

This is not surprising to me: If we don't have a class FunctionTime time 
variable, I would expect get_time to either error or output zero. However, 
while in my function, get_time() always returns zero, in apparently does 
not do so in step-26. Can someone help me understand this?

Thank you,
Kyle

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