I need function pointers!!!

Kye

SPIN, you're letting me down. I like need some function pointers for indirecting RTC access for my file system driver.

I look forward to C on the Prop 2 - Or atleast some type of C -> SPIN bytecode translator.

wjsteele

I thought someone hacked them into some sample code a while back... perhaps it was the Beau himself?

Bill

RobotWorkshop

Is this the thread you were referring to?

http://forums.parallax.com/showthread.php?127057-DEMO-Self-Modify-Spin-Code-Example&highlight=pointers

Dave Hein

Kye,

I posted a MethodPointer object to the OBEX earlier this month. It is located at http://obex.parallax.com/objects/697/ .

It was discussed in the thread at http://forums.parallax.com/showthread.php?128397-Callbacks-and-Method-Pointers-in-Spin&highlight=pointer . The technique I use doesn't modify the method tables or the Spn bytecodes (except for a small amount done at initialization). It just requires a 4-word buffer for each method pointer that is used.

Dave

jazzed

Just use the object array unbounded method.

obj
  ' normal code
  serial           : "FullDuplexSerial"
  ' insert other normal object here

  ' unbound method code is last
  objarray[1] : "method0" ' contains PUB method to call per array index
  opt1method  : "method1" ' contains PUB method to call per array index
  opt2method  : "method2" ' contains PUB method to call per array index
  optNmethod  : "methodN" ' contains PUB method to call per array index
  ' no more objects

Call method by object index. This has risks of course like if Parallax updates the compiler to do object array bounds checks - one would hope that our list of desirable enhancements might get addressed first. YMMV.

RossH

jazzed wrote: »

Just use the object array unbounded method.

obj
  ' normal code
  serial           : "FullDuplexSerial"
  ' insert other normal object here

  ' unbound method code is last
  objarray[1] : "method0" ' contains PUB method to call per array index
  opt1method  : "method1" ' contains PUB method to call per array index
  opt2method  : "method2" ' contains PUB method to call per array index
  optNmethod  : "methodN" ' contains PUB method to call per array index
  ' no more objects

Call method by object index. This has risks of course like if Parallax updates the compiler to do object array bounds checks - one would hope that our list of desirable enhancements might get addressed first. YMMV.

Very cute! I had forgotten all about object arrays - thank goodness for languages that do not do any bounds checking!

Ross.