Constant Objects?

Monkey Forums/Monkey Programming/Constant Objects?

SHiLLSiT

(Posted 2013) [#1]

I've tried this, but this doesn't work:

Const SOME_COLOR:COLOR = New Color(255,255,255)

Is there an alternative to creating constant objects that I am not aware of?

Markus

(Posted 2013) [#2]

Const  i:Int=$ffffffFF

Polan

(Posted 2013) [#3]

Int is not an object in Blitz laungages.
You could always do Global SOME_COLOR:COLOR and pretend it to be constant. The same way we are pretending some class variables are private.
And with monkey being case sensitive? you can say "variable with ALL_CAPS is constant, do not change it".

Gerry Quinn

(Posted 2013) [#4]

Or make the object private, with public functions that access copies of it or its fields.

But at the end of the day, it's a lot of cruft to avoid people doing stuff that they should know better than to do anyway. Giving it a name that indicates its intended constant nature is probably the best approach. For many people, ALL_CAPS indicates a constant.

computercoder

(Posted 2013) [#5]

Int is not an object in Blitz laungages.

You CAN use int as an Object in Monkey by using the IntObject class. Per Monkey Help:

The IntObject box class can be used to encapsulate an int value inside an object.

Polan

(Posted 2013) [#6]

Sure, but it's just class-wrapper, small class with 1 field.

Class IntObject
   Field val%
EndClass

And that make instance of it an object, and object can't be constant right?

rIKmAN

(Posted 2013) [#7]

I know you wanted Consts but how about:

Global COLOR_RED:Float[]
Global COLOR_GREEN:Float[]
Global COLOR_BLUE:Float[]

...

COLOR_RED = [255.0, 0.0, 0.0]
COLOR_GREEN = [0.0, 255.0, 0.0]
COLOR_BLUE = [0.0, 0.0, 255.0]

....

Cls(COLOR_RED[0], COLOR_RED[1], COLOR_RED[2]
Cls(COLOR_GREEN[0], COLOR_GREEN[1], COLOR_GREEN[2]
Cls(COLOR_BLUE[0], COLOR_BLUE[1], COLOR_BLUE[2]

etc

Markus

(Posted 2013) [#8]

my example showed how he can use a rgba value as a constant in relation of his row of source code.

computercoder

(Posted 2013) [#9]

And that make instance of it an object, and object can't be constant right?

Thats right. However, who said you couldn't do the following:

Class IntObj
  Const val% = $FFFFFF
End

You would achieve the same result as a constant, but within an object! :)

ziggy

(Posted 2013) [#10]

Private
Global MyPrivateColor:=New Color(255,255,255)
Public
Function MYCOLOR:Color();
    Return MyPrivateColor;
End

MYCOLOR acts like a constant in this scenario.

Gerry Quinn

(Posted 2013) [#11]

So long as Color has no public methods that can change it (or public fields)!