Hi,
I'm trying to nest environments in my Jolt code as I would in Scheme
(but there I'd use a 'let*' instead of just 'let'):
(define test
(lambda (foo)
(let ((bar 1)
(bot (lambda ()
(set bar 3))))
(printf "bar is %d\n" bar)
(set bar 2)
(printf "bar is %d\n" bar)
(bot)
(printf "bar is %d\n" bar))))
(test)
I'd want to see:
bar is 1
bar is 2
bar is 3
However, this code produces a compile-time error:
Object.st:138 Object error:
Compiler.st:917 Compiler errorUndefined:
Compiler.st:704 ? []
Object.st:84 UndefinedObject ifNil:
Compiler.st:195 Compiler lookupVariable:ifAbsent:
Compiler.st:704 Compiler setVariable:from:
Compiler.st:697 Compiler xSet:
Compiler.st:337 Compiler performSyntax:with:
Compiler.st:306 Compiler translateExpression:
Compiler.st:269 Expression translate:
[...]
undefined: bar
Upon investigation, the error is caused by the reference to 'bar' in
the innermost lambda.
How do I construct a closure in Jolt that can bind to variables that
are local to the function in which the closure was created? I'd like
this in order to implement a useful callback function (which modifies
the state of its lexical environment, regardless of its caller). I
don't want to use global variables due to multithreading concerns.
Thanks for any help you can offer,
--
Michael FIG <[EMAIL PROTECTED]> //\
http://michael.fig.org/ \//
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