Hi, Ian Piumarta <[EMAIL PROTECTED]> writes:
> First, if you don't mind having a special calling convention for > closures, create a tuple containing a function pointer (lambda) and > the data it is supposed to operate on. Invoke all your closures > using a function that calls the closure's function pointer, passing > the closure's data as an argument. The data can be anything, > including an array of 'free variables' or even a list of such arrays > linked through their first element (this is actually pretty close to > the way Pepsi implements blocks). You know, this sounds close to what I want. I think my needs would be fulfilled by a simple (for you, but apparently not for me) change to function/object/BlockClosure.st. I believe this can be done using the existing StaticBlockClosure calling convention. I'm thinking that another child of StaticBlockClosure (maybe called StatefulBlockClosure) that has a 'state' member would be appropriate. I hope that it could use the same 'value' methods that StaticBlockClosure does. I tried doing that, but I get segfaults that I don't really know how to debug... I'm probably missing something obvious (attached is my attempt). I would manually set up a StatefulBlockClosure from Jolt code, building its variableArray by hand. Eventually, it may make sense to have some Jolt syntax extensions to create a closure in this way. For my current problem, passing Jolt callback functions to Pepsi, my suggestion is just to implement dynamic extent using this minimal change. I believe that the more advanced changes (your other "three options") aren't needed for what I'm trying to accomplish right now. Thanks, -- Michael FIG <[EMAIL PROTECTED]> //\ http://michael.fig.org/ \// Index: objects/BlockClosure.st =================================================================== --- objects/BlockClosure.st (revision 245) +++ objects/BlockClosure.st (working copy) @@ -1,4 +1,4 @@ -" BlockClosure.st -- defferred execution of code +" BlockClosure.st -- deferred execution of code Copyright (c) 2006, 2007 Ian Piumarta All rights reserved. @@ -106,6 +106,12 @@ ] +StatefulBlockClosure function_: _implementationAddress arity_: _argumentCount state: variableArray +[ + self := super function_: _implementationAddress arity_: _argumentCount. + state := variableArray. +] + BlockClosure function_: _implementationAddress arity_: _argumentCount outer: outerBlock state: variableArray nlr_: _dynamicEnvironment [ Index: objects/Objects.st =================================================================== --- objects/Objects.st (revision 245) +++ objects/Objects.st (working copy) @@ -45,6 +45,7 @@ SlotDictionary : Object ( _size _tally _keys _values default ) StaticBlockClosure : Object ( _function _arity ) BlockClosure : StaticBlockClosure ( outer state _nlr ) + StatefulBlockClosure : StaticBlockClosure ( state ) SinkStream : Object () ReadStream : Object ( collection position readLimit ) WriteStream : ReadStream ( writeLimit ) _______________________________________________ fonc mailing list fonc@vpri.org http://vpri.org/mailman/listinfo/fonc
