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>> > >> > With LibRandom you have to create a 'Variate' object, but
>> > >>
>> >
>> > >> But WHY do you think one cannot prepackage standard
>> >
>> > >> variates as read-only exported variables?
>> > >> This is the third time already this issue occurs!
>> > >> Stan was first to point it out a while ago, I
>> discussed it too...
>> >
>> > It would not work here. Variates cannot be global variables
>> > as they have private state:
>>
>> There are many exported variables declared with ABSTRACT
>> types in BlackBox that have private state.
>> They contain references to (hidden) concrete types that are
>> extensions of their static type.
>> For instance, TextViews.dir has static type
>> TextViews.Directory and dynamic type StdDirectory.
>>
>> At initialization, an object with a concrete extending type
>> is allocated and the pointer is assigned to the global variable.
>> They call it "separation of interface from implementation".
>> It's one of the cornerstones of BlackBox.
>> The more flexible and general one's framework has to be,
>> the more important this principle is.
>>
>> Cheers
>> Fyodor
I suspect I don't like the design of TextViews.dir. I use
it quite happily for years then along comes another module
that changes the attributes to 50 point red digbats. The next
time I use it my Text does not work as I expect and want.
Surely (with a few exceptions) it is not good to rely on
side effects of (non-readonly, or more precisely non-alterable)
global variables.
I have a simulation using Normal Variates with standard deviation = 1.
Some other module changes this to sd = 5 for it's use. Now when I use it
again I get the wrong distribution. Safety demands that my Random Variable,
with it's state, are private to my simulation (which in fact may
simultaneously need several different Normal Variates simultaneously).
Is it time to agree to differ?
Cheers, Robert
ps - I am not against abstract directories as such. Look at the
interface for AlgebraRings; you will fine TWO abstract directory
types and no concrete ones.
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Received on Wed Dec 01 2004 - 13:09:56 UTC