22 Jun
2007
22 Jun
'07
3:55 p.m.
On Fri, 2007-06-22 at 10:52 +0400, Bulat Ziganshin wrote:
i tried it once and found that ByteArray# size is returned rounded to 4 - there is no way in GHC runtime to alloc, say, exactly 37 bytes. and don't forget to add 2 unused bytes at average
Right, GHC heap object are always aligned to the natural alignment of the architecture, be that 4 or 8 bytes.
that i'm trying to say is that one need to store exact string size because value returned by getSizeOfByteArray is aligned to 4
Ah yes, you're quite right. To allow GHC's ByteArray# to be used to implement a compact string type it'd have to be changed to store the length in bytes rather than words. Duncan