On 02/11/2011 10:03 AM, %u wrote:
Hi,
I think I'm having a little trouble understanding what's meant by context-free
grammar. I've read that D is context-free, but is it really? What about an
expression like:
int[U] s;
? You can't tell -- without looking at the context -- whether U is a data type
or a number, and so because associative arrays and regular arrays are
syntactically different elements of the language, the syntax of D is tied in
with its semantics, just like in C++.
So is D really context-free? Or am I misunderstanding the meaning of the term?
Have you tried it? int[U] cannot be a plain array because the size must be
constant. But I agree there is some context in play for the compiler (or rather
the linker?) to determine /that/:
--> some error if U undefined
--> some other error if defined, but neither uint nore type
--> some other error if uint but not constant
--> ass array if type
(I guess)
Denis
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