What are you?

>>2 is a C++ programmer
>>3 is a Java Programmer
>>4 Doesn't know what he's talking about
>>5 Loves XP
>>6 Thinks XP means Windows XP
>>7 Hates pair programming
>>8 Hates /prog/ because it is full of tards
>>9 Loves java
>>10 opposes java

I don't get what is the use in passing in only the address of an object type, I mean, why not just slam the entire object itself through the parameters so you get to fully fuck with it inside the function whenever you choose? Or is it still possible to do this even when passing by reference because you have the address? I'm sure then it does make more sense than passing in the entire object, but how do I exactly get to use that address to fuck with the object itself while possibly sparing a bit of compiler time by using just reference?