isolate in SMLofNJ.Cont
I was reading about continuations in Standard ML (SMLofNJ.Cont). I understood what callcc and throw does, but could not understand isolate. The documentation says
Discard all live data from the calling context (except what is reachable from f or x), then call f(x), then exit. This may use much less memory then something like f(x) before exit().
However this does not make any sense to me. I just wanted to know what this function does, with some examples.
functional-programming sml smlnj continuation-passing
asked Nov 21 '18 at 15:22
himhim
866
add a comment |
I was reading about continuations in Standard ML (SMLofNJ.Cont). I understood what callcc and throw does, but could not understand isolate. The documentation says
Discard all live data from the calling context (except what is reachable from f or x), then call f(x), then exit. This may use much less memory then something like f(x) before exit().
However this does not make any sense to me. I just wanted to know what this function does, with some examples.
functional-programming sml smlnj continuation-passing
asked Nov 21 '18 at 15:22
himhim
866
add a comment |
I was reading about continuations in Standard ML (SMLofNJ.Cont). I understood what callcc and throw does, but could not understand isolate. The documentation says
Discard all live data from the calling context (except what is reachable from f or x), then call f(x), then exit. This may use much less memory then something like f(x) before exit().
However this does not make any sense to me. I just wanted to know what this function does, with some examples.
functional-programming sml smlnj continuation-passing
asked Nov 21 '18 at 15:22
himhim
866
I was reading about continuations in Standard ML (SMLofNJ.Cont). I understood what callcc and throw does, but could not understand isolate. The documentation says
Discard all live data from the calling context (except what is reachable from f or x), then call f(x), then exit. This may use much less memory then something like f(x) before exit().
However this does not make any sense to me. I just wanted to know what this function does, with some examples.
functional-programming sml smlnj continuation-passing
functional-programming sml smlnj continuation-passing
asked Nov 21 '18 at 15:22
himhim
866
asked Nov 21 '18 at 15:22
himhim
866
asked Nov 21 '18 at 15:22
himhim
866
asked Nov 21 '18 at 15:22
himhim
866
asked Nov 21 '18 at 15:22
himhim
866
866
add a comment |
add a comment |
1 Answer
1
active
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MLton does a better job of explaining an implementation of isolate using callcc and throw:
val isolate: ('a -> unit) -> 'a t =
fn (f: 'a -> unit) =>
callcc
(fn k1 =>
let
val x = callcc (fn k2 => throw (k1, k2))
val _ = (f x ; Exit.topLevelSuffix ())
handle exn => MLtonExn.topLevelHandler exn
in
raise Fail "MLton.Cont.isolate: return from (wrapped) func"
end)
We use the standard nested callcc trick to return a continuation that is ready to receive an argument, execute the isolated function, and exit the program. [...]
The page continues to explain how to achieve the same effect with less space leaking.
MLton's CONT signature has a different documentation line than SML/NJ's CONT signature:
isolate fcreates a continuation that evaluatesfin an empty context.
This is a constant time operation, and yields a constant size stack.
answered Nov 22 '18 at 7:53
Simon ShineSimon Shine
9,44513047
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
MLton does a better job of explaining an implementation of isolate using callcc and throw:
val isolate: ('a -> unit) -> 'a t =
fn (f: 'a -> unit) =>
callcc
(fn k1 =>
let
val x = callcc (fn k2 => throw (k1, k2))
val _ = (f x ; Exit.topLevelSuffix ())
handle exn => MLtonExn.topLevelHandler exn
in
raise Fail "MLton.Cont.isolate: return from (wrapped) func"
end)
We use the standard nested callcc trick to return a continuation that is ready to receive an argument, execute the isolated function, and exit the program. [...]
The page continues to explain how to achieve the same effect with less space leaking.
MLton's CONT signature has a different documentation line than SML/NJ's CONT signature:
isolate fcreates a continuation that evaluatesfin an empty context.
This is a constant time operation, and yields a constant size stack.
answered Nov 22 '18 at 7:53
Simon ShineSimon Shine
9,44513047
add a comment |
MLton does a better job of explaining an implementation of isolate using callcc and throw:
val isolate: ('a -> unit) -> 'a t =
fn (f: 'a -> unit) =>
callcc
(fn k1 =>
let
val x = callcc (fn k2 => throw (k1, k2))
val _ = (f x ; Exit.topLevelSuffix ())
handle exn => MLtonExn.topLevelHandler exn
in
raise Fail "MLton.Cont.isolate: return from (wrapped) func"
end)
We use the standard nested callcc trick to return a continuation that is ready to receive an argument, execute the isolated function, and exit the program. [...]
The page continues to explain how to achieve the same effect with less space leaking.
MLton's CONT signature has a different documentation line than SML/NJ's CONT signature:
isolate fcreates a continuation that evaluatesfin an empty context.
This is a constant time operation, and yields a constant size stack.
answered Nov 22 '18 at 7:53
Simon ShineSimon Shine
9,44513047
add a comment |
MLton does a better job of explaining an implementation of isolate using callcc and throw:
val isolate: ('a -> unit) -> 'a t =
fn (f: 'a -> unit) =>
callcc
(fn k1 =>
let
val x = callcc (fn k2 => throw (k1, k2))
val _ = (f x ; Exit.topLevelSuffix ())
handle exn => MLtonExn.topLevelHandler exn
in
raise Fail "MLton.Cont.isolate: return from (wrapped) func"
end)
We use the standard nested callcc trick to return a continuation that is ready to receive an argument, execute the isolated function, and exit the program. [...]
The page continues to explain how to achieve the same effect with less space leaking.
MLton's CONT signature has a different documentation line than SML/NJ's CONT signature:
isolate fcreates a continuation that evaluatesfin an empty context.
This is a constant time operation, and yields a constant size stack.
answered Nov 22 '18 at 7:53
Simon ShineSimon Shine
9,44513047
MLton does a better job of explaining an implementation of isolate using callcc and throw:
val isolate: ('a -> unit) -> 'a t =
fn (f: 'a -> unit) =>
callcc
(fn k1 =>
let
val x = callcc (fn k2 => throw (k1, k2))
val _ = (f x ; Exit.topLevelSuffix ())
handle exn => MLtonExn.topLevelHandler exn
in
raise Fail "MLton.Cont.isolate: return from (wrapped) func"
end)
We use the standard nested callcc trick to return a continuation that is ready to receive an argument, execute the isolated function, and exit the program. [...]
The page continues to explain how to achieve the same effect with less space leaking.
MLton's CONT signature has a different documentation line than SML/NJ's CONT signature:
isolate fcreates a continuation that evaluatesfin an empty context.
This is a constant time operation, and yields a constant size stack.
answered Nov 22 '18 at 7:53
Simon ShineSimon Shine
9,44513047
answered Nov 22 '18 at 7:53
Simon ShineSimon Shine
9,44513047
answered Nov 22 '18 at 7:53
Simon ShineSimon Shine
9,44513047
answered Nov 22 '18 at 7:53
Simon ShineSimon Shine
9,44513047
9,44513047
add a comment |
add a comment |
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