[REBOL] Re: TUPLE! DATA-MODEL & OTHER VALUES
From: karlr20:home at: 13-Jun-2001 10:36
> It seems like there are about 16 bytes allocated per element when the empty
> block is created, but when I insert 10000 decimal! values at a minimum of 8
> bytes per element into it, the memory allocation does not increase.
>
> Does this imply the "pointers" for the block elements have room somewhere
> for short simple types, or does the block creation simply allocate a
> certain amount of space for short simple values?
>
> Are the values of simple block elements stored consecutively in memory, or
> does the block just contain "pointers" to values in the heap?
>
> Any comments would be much appreciated.
>
> -Larry
Hi Larry,
I've written a C++ class to read REBOL code as values and now my own
REBOL-like language. I'm pretty sure I have a handle on how REBOL stores
values.
My basic value is something like this:
struct Value {
DatatypeReference type;
union data {
int integer;
double decimal;
bool logic;
char tuple[10];
Block* block;
String* string;
// etc...
};
};
For REBOL the sizeof(Value) seems to be 16 bytes. As you can see, adding any
simple data type to a block (array of Values) will not increase its size as
the data is stored in the value. I hope this helps you to visualize what may
be going on.
-Karl
P.S. Opps, I just realized I have assumed you are a C programmer!
