so I got a `Vec3` class where I retrieve components as ```ov kotlinlang #announcements

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Title

e

elect

09/24/2018, 12:14 PM

so, I got a

Vec3

class where I retrieve components as

override var x: Float
        get() = array[ofs]
        set(value) = array.set(ofs, value)

Why from java

getX()

returns

Float

instead

float

?

a

Andreas Sinz

09/24/2018, 12:18 PM

What type is

array

?

Array<Float>

?

p

poohbar

09/24/2018, 12:20 PM

yeah for primitive floats you would have to use

FloatArray

e

elect

09/24/2018, 12:21 PM

FloatArray

however

Vec3 : Vec3t<Float>

and

abstract class Vec3t<T : Number> {

    abstract var x: T

a

Andreas Sinz

09/24/2018, 12:23 PM

then there is no way to use primitive types

d

diesieben07

09/24/2018, 1:02 PM

No way to use them directly. The compiler will use them transparently when possible.

e

elect

09/24/2018, 3:38 PM

how can I check if a simple code like

val a = Vec3()
    val b = a.x

is involving boxing?

this is the corresponding bytecode

L2
    LINENUMBER 146 L2
    ALOAD 1
    INVOKEVIRTUAL glm_/vec3/Vec3.getX ()Ljava/lang/Float;
    INVOKEVIRTUAL java/lang/Float.floatValue ()F
    FSTORE 2
   L3

@Andreas Sinz @diesieben07

d

diesieben07

09/24/2018, 4:40 PM

You mean you want to be able to tell without looking at the bytecode?

e

elect

09/24/2018, 4:40 PM

either way

d

diesieben07

09/24/2018, 4:41 PM

Well, when looking at the bytecode you can see that

java.lang.Float

is being used, which is the boxed version

e

elect

09/24/2018, 4:46 PM

if I inline

.x

the bytecode viewer crash

how to check if it's boxed then?

d

diesieben07

09/24/2018, 5:05 PM

You could use javap or other bytecode viewers

Or know that generics means erasure, which requires boxing

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