Re: Thoughts about RichObjects, Implicit convertions and performance

>
>
> On Tue, Mar 24, 2009 at 9:36 AM, Viktor Klang <viktor.klang@...
> <mailto:viktor.klang@...>> wrote:
>
>     I'd like:
>
>     object MyImplicits
>     {
>     //Syntax
>     //      implicit[targetType] def methodName[type params](params) :
>     returnType = { expr }
>
>
>     //i.e
>              implicit[String] def isAllDigits = this.matches("^\\d+$")
>
>              implicit[Z <: AnyRef] def asInstanceOf[T](implicit clasz :
>     Manifest[T]) : clasz.cast(this)
>
>
> implicit[Z <: Any*Val*] def asInstanceOf[T](implicit clasz :
> Manifest[T]) : clasz.cast(this)
>  
>
>
>     }
>
>     //usage:
>
>     import MyImplicits._
>
>     "0000".isAllDigits
>
>     5.asInstanceOf[Fajita] //Yes, this example is the very definition of WTF
>
>
>     On Tue, Mar 24, 2009 at 7:42 AM, Johannes Rudolph
>     <johannes.rudolph@...
>     <mailto:johannes.rudolph@...>> wrote:
>
>         On Tue, Mar 24, 2009 at 7:23 AM, David Hall
>         <dlwh@... <mailto:dlwh@...>> wrote:
>          > Second observation, your benchmarking (below) is the "wrong"
>         way to
>          > benchmark JVM code because of the peculiarities of hotspot.
>         You should
>          > wrap these calls in a method and call it at least 10,000
>         times in a
>          > method before clocking speeds. HotSpot can do amazing things
>         when you
>          > give it a chance.
>          >
>          > That said, my understanding* is that HotSpot does not (yet**)
>         do a
>          > great job removing object creations, which is what is needed
>         to really
>          > make implicits faster.
>
>         Right, see
>         http://wikis.sun.com/display/HotSpotInternals/MicroBenchmarks
>         for some tips how to fix microbenchmarks with the Hotspot
>         compiler of
>         the OpenJDK. You can use -XX:+PrintCompilation VM option (with
>         OpenJDK
>         or Sun JVM) to see when methods get JIT-compiled. In this particular
>         case my tries showed, that the method is compiled just after
>         (while?)
>         the first run, so doing 10 iterations of the whole method should
>         suffice.
>
>         Johannes
>
>         -----------------------------------------------
>         Johannes Rudolph
>         http://virtual-void.net
>
>
>
>
>     --
>     Viktor Klang
>     Senior Systems Analyst
>
>
>
>
> --
> Viktor Klang
> Senior Systems Analyst