Can't talk too much about CLR, but interop with CLR while having similarities
syntax wise
is a different interop beast (like JS interop has its specifics).
You can compare CLR and the JVM but not with Java.
Java is a implementation of a language on top of the JVM as Clojure is over
both
the JVM and CLR (and JS).
The JVM and CLR (and JS) in this context are engines running language
implementations, not language implementations by themselves.
Clojure is not Java and vice-versa. Java objects are values to Clojure.
So is a Boolean object. What you have shown here is a Java specific behaviour,
an ugly patch introduced in Java 5. Even then,
System.out.println(f == Boolean.FALSE); // false
Can be seen as odd. According to the original poster, I could complain that this
result is non sense in regards to this one:
System.out.println(f == false); // true
Knowing that Boolean.FALSE is the false primitive value and that the Boolean
object
has its wrapped value set as false. I could complain that they should be equal.
Performance of your suggestion has been measured as posted in this thread, 20x
slower.
Considering that it's not recommended even by Java implementors to use this
class
instead of the primitive type, that it's an alien issue to Clojure and that it
hampers
performance significantly, it's not worth it.
This case (and this thread) should be dead by now.
Luc
> What is the situation in ClojureCLR?
>
> And, seeing the if code cited, I just run this code:
>
> public class BoolTest {
> public static void main(String[] args)
> {
> Boolean f = new Boolean(false);
> System.out.println(f.equals(false)); // true
> System.out.println(f == false); // true
> System.out.println(f == Boolean.FALSE); // false
> System.out.println(f.equals(Boolean.FALSE)); // true
> }
> }
>
> why not replace
> public Object eval() {
> Object t = testExpr.eval();
> if(t != null && t != Boolean.FALSE)
> return thenExpr.eval();
> return elseExpr.eval();
> }
>
> by
> public Object eval() {
> Object t = testExpr.eval();
> if(t != null && !t.equals(Boolean.FALSE))
> return thenExpr.eval();
> return elseExpr.eval();
> }
>
>
> My guess: performance. But it should be measured
>
> Angel "Java" Lopez
> http://www.ajlopez.com
> http://twitter.com/ajlopez
>
>
> On Sat, Apr 14, 2012 at 6:16 AM, Vinzent <ru.vinz...@gmail.com> wrote:
>
> > So 'false?' doesn't help you here.
> >>
> > It does, actually (see earlier responses for details)
> >
> >
> >> So if anyone runs into this problem _in real world code_ it's because
> >>
> >> they are calling a Java API that somehow returns a Java Boolean object
> >> embedded in the result. If you are working with a Java data structure
> >> full of _Objects_ then you need to take care of converting those
> >> Object instances into appropriate Clojure values. Calling (boolean v)
> >> is sufficient to convert the Java Object to a Clojure true/false
> >> value.
> >>
> > Yeah it was stated in the very beginning of the thread.
> >
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