shithub: mc

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Allow 'empty slices' for slalloc/slfree

    This allows you to initialize slices to empty, and then
    free them safely. I find this is useful for building up
    slices incrementally, where you start with an empty
    slice and grow it as you go.

--- a/libstd/alloc.myr

+++ b/libstd/alloc.myr

@@ -90,6 +90,9 @@

 /* allocates a slice of 'len' elements. */

 generic slalloc = {len

+	if len == 0

+		-> [][:]

+	;;

 	-> (bytealloc(len*sizeof(@a)) castto(@a#))[0:len]

 }

@@ -100,6 +103,9 @@

 /* Frees a slice */

 generic slfree	 = {sl

+	if sl.len == 0

+		->

+	;;

 	bytefree(sl castto(byte#), sl.len * sizeof(@a))

 }