shithub: mc

ref: 63405aa8ca5abcca5cf1b1abb4c0b3648aa5bfc4
dir: /lib/std/fndup.myr/

use "alloc"
use "die"
use "sldup"
use "types"

pkg std =
	generic fndup	: (fn : @fn::function -> @fn::function)
	generic fnfree	: (fn : @fn::function -> void)
;;

generic fndup = {fn
	var repr : intptr[2]

	repr = (&fn castto(intptr[2]#))#
	repr[0] = sldup(envslice(repr[0])) castto(intptr)
	-> (&repr castto(@fn::function#))#
}

generic fnfree = {fn
	var repr : intptr[2]

	repr = (&fn castto(intptr[2]#))#
	std.slfree(envslice(repr[0]))
}

const envslice = {ep : intptr
	var env : byte#
	var szp : intptr#

	env = ep castto(byte#)
	szp = env castto(intptr#)
	-> env[:szp#]
}