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<u0_a871>
I want to compile racket, for a shared library. It did not work. It was something like "Still not supported".
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<jA_cOp>
What's the equivalent of a try-finally in Racket? If I want to run a particular function when an expression ends, whether because it returned, or an exception was thrown
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<bremner>
can't you use (begin (with-handlers ... ) ( ... finally stuff )) ? Or am I missing something about finally?
<jA_cOp>
bremner: so I guess that's assuming that I catch and discard the exception in a handler, right? I think the difference is that with try-finally, the exception is rethrown for me once the finally block is executed
<bremner>
oic.
<bremner>
then I guess you want one of the macros linked? I didn't really check the details.
<jA_cOp>
thanks - the macros you linked are indeed spot on, but this is for a fairly small script so I'm probably not going to use any of these
<jA_cOp>
My thinking was - if Racket's with-handlers doesn't have functionality equivalent of try-finally, is there because it doesn't need it, because there's a better way to structure it? If not, maybe users would benefit if with-handlers had support for a #:finally clause?
<jA_cOp>
The structure in my script is now this: (with-handlers ([exn:break? (lambda (x) (finally-do-this) (raise x)]) body) (finally-do-this)
<jA_cOp>
I feel like I'm missing something obvious! :)
<jA_cOp>
Basically, all I want is to run (finally-do-this) at the end of the script, regardless of whether it ended normally, or via break. (as an aside, in this specific case I could use the equivalent of atexit (plumber?) since the end of the block is the end of the program)
<jA_cOp>
Using try-finally without a catch clause is also equivalent of a destructor in RAII (ala C++), or using a guard clause, like `defer` in Go, or scope(exit) in D
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