On 2/11/11 6:03 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?
Thanks!
That will always parse to an associative array. Then in the semantic
pass, if U is a constant expression that turns out to be an integer it
is reinterpreted as a static array.
Take a look:
https://github.com/D-Programming-Language/dmd/blob/master/src/mtype.c#L3924
