When i try to make a copy of a PVector using get() I get a deprecated warning. whats going on?

LouW

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GoToLoop

As for most warnings, simply ignore them! :P

Chrisir

copy() Get a copy of the vector

https://www.processing.org/reference/PVector.html

LouW

Thanks for the reply, but i should have done a better job of explaining the problem. In D.Shiffman's book "nature of code" he says that when an object, like a PVector, is passed into a function it is passed by reference. I think he said that to protect the value of the PVector a copy of it should be passed in by using a line of code like:

PVector f = force.get();

When I try this the .get() is underlined in yellow and a warning says "deprecated". This is what i don't understand.

GoToLoop

https://Docs.Oracle.com/javase/9/docs/api/java/lang/Deprecated.html

... ; it has been superseded by a newer, usually preferable alternative; ...

GoToLoop

... when an object, like a PVector, is passed into a function it is passed by reference.

Actually, all Java objects are already a reference (or pointer or memory address) value. ~O)

All Java arguments passed to functions' parameters are values; either a reference value if it's an Object, or a primitive value otherwise. :-B

Chrisir

replace get() with copy()

That’s what I meant

neilcsmith_net

Yes, if you look at the source code for get() you'll see all it does is call copy() they're basically identical - https://github.com/processing/processing/blob/master/core/src/processing/core/PVector.java#L378 Sometimes things are deprecated just because the first choice of name wasn't very obvious!

@GoToLoop is right - does Shiffman really use the words "passed by reference"?! If so, that's rather a blatant mistake.

LouW

Thanks guys for the help. I really appreciate it.