If you process the value to add at runtime, things get complicated. You must pass the value to the function before the function is called. This normally results in some global variable that is used both by the function that calls the algorithm and by the function that is called by the algorithm to add that value. This is messy!

• If you process the value to add at runtime, things get complicated. You must pass the value to the function before the function is called. This normally results in some global variable that is used both by the function that calls the algorithm and by the function that is called by the algorithm to add that value. This is messy!

• With function objects, you can write a “smarter” function that behaves in the desired way. Because the object may have a state, it can be initialized by the correct value.