Created
September 26, 2019 00:14
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#include "share/atspre_staload.hats" | |
vtypedef llist(a:vt@ype) = List_vt(a) | |
extern fun{fa,a0:vt0p}{fb,b0:vt0p} | |
monad_bind: (!fa) -> fb | |
extern fun{a0:vt0p}{fb,b0:vt0p} | |
monad_bind$f: (!a0) -> fb | |
extern fun{fa,a0:vt0p}{fb,b0:vt0p} | |
monad_fmap: (!fa) -> fb | |
extern fun{a0:vt0p}{b0:vt0p} | |
monad_fmap$f: (!a0) -> b0 | |
extern fun{fa,a0:vt0p}{fb,b0:vt0p} | |
monad_bind_free: fa -> fb | |
extern fun{a0:vt0p}{fb,b0:vt0p} | |
monad_bind_free$f: a0 -> fb | |
extern fun{fa,a0:vt0p}{fb,b0:vt0p} | |
monad_fmap_free: (fa) -> fb | |
extern fun{a0:vt0p}{b0:vt0p} | |
monad_fmap_free$f: a0 -> b0 | |
extern fun{fa,a0:vt0p} | |
monad_return(x0: a0): fa | |
implement(a:vt@ype) | |
monad_return<llist(a),a>(x0) = list_vt_sing(x0) | |
implement(a:vt@ype) | |
monad_return<llist(a),a>(x0) = list_vt_sing(x0) | |
implement(a,b:t@ype) | |
monad_bind<llist(a),a><llist(b),b>(fx) = | |
list_vt_concat<b>(list_vt_map<a><llist(b)>(fx)) where | |
implement | |
list_vt_map$fopr<a><llist(b)>(x) = | |
monad_bind$f<a><llist(b),b>(x) | |
end | |
implement{fa,a0}{fb,b0} | |
monad_fmap(fx) = | |
( | |
monad_bind<fa,a0><fb,b0>(fx) where | |
implement | |
monad_bind$f<a0><fb,b0>(x0) = | |
(monad_return<fb,b0>(monad_fmap$f<a0><b0>(x0))) | |
end | |
) | |
implement(a,b:t@ype) | |
monad_bind_free<llist(a),a><llist(b),b>(fx) = | |
list_vt_concat<b>(list_vt_mapfree<a><llist(b)>(fx)) where | |
implement | |
list_vt_mapfree$fopr<a><llist(b)>(x) = | |
monad_bind_free$f<a><llist(b),b>(x) | |
end | |
implement{fa,a0}{fb,b0} | |
monad_fmap_free(fx) = | |
( | |
monad_bind_free<fa,a0><fb,b0>(fx) where | |
implement | |
monad_bind_free$f<a0><fb,b0>(x0) = | |
(monad_return<fb,b0>(monad_fmap_free$f<a0><b0>(x0))) | |
end | |
) | |
local | |
implement fprint_list_vt$sep<>(out) = () | |
in | |
fun test_free(): void = | |
{ | |
val xs = $list_vt{int}(70,114,101,101,100) | |
val ys = monad_fmap_free<llist(int),int><llist(char),char>(xs) where | |
implement | |
monad_fmap_free$f<int><char>(x) = int2char0(x) | |
end | |
val () = println!(ys) where | |
implement fprint_list_vt$sep<>(out) = () | |
end | |
val () = list_vt_free(ys) | |
} | |
fun test_preserve(): void = | |
{ | |
val xs = $list_vt{int}(80,114,101,115,101,114,118,101,100) | |
val ys = monad_fmap<llist(int),int><llist(char),char>(xs) where | |
implement | |
monad_fmap$f<int><char>(x) = int2char0(x) | |
end | |
val () = println!(ys) | |
// notice: xs was preserved so we need to free it... | |
val () = list_vt_free(xs) | |
val () = list_vt_free(ys) | |
} | |
end | |
implement main0() = (test_free(); test_preserve()) |
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