Re: Size of a pointer to a tagged record

[Jeffrey Carter <jrcarter@acm.org>]

Steven Murdoch wrote:
> I am writing a binding to the Lua (http://www.lua.org/)
> scripting language (which is written in C). One thing I
> need to do is store a pointer to a tagged record in a
> memory location allocated by malloc. For this reason I need
> to know the size.

If you declare your access type as having Convention C, then it will be 
the same size as a C pointer, and your C stuff can safely use the size 
of a C pointer.

If you tell the C side what size to use, then why not simply calculate 
the size to pass to C? You can use 
Type_Name'Max_Size_In_Storage_Elements, or {Object_Name'Size + 
Storage_Unit - 1) / Storage_Unit.

-- 
Jeff Carter
"Go and boil your bottoms."
Monty Python & the Holy Grail