Wes:
1. Is int[3,3] the same in memory as int[3][3]?
I can't really tell based on the description.
http://dlang.org/arrays.html
Your first syntax is more like C#, not D.
In D there are fixed-sized arrays like your second one, and it's
rectangular, it's nine adjacent integers.
A dynamic array of length 3 of a dynamic of 3 integers, created
like this:
new int[][](3, 3)
is a very different data structure. It's a 2-word that contains
length and pointer, the pointer points to 3 2-words that contain
length and pointer, each one pointing to a 3-int chunk of memory
(plus on each row a bit of bookeeping for the GC and to append
new items).
2. Is there a command such as #error or #warning in D?
I assume this is maybe #pragma (msg, "error message") static
assert(0);?
pragma(msg, "...") is for compile time messages.
Maybe an alternative is to use:
static assert(0, "...");
But in release mode it doesn't print the message.
3. Can you use static if() {} with the {} block?
Yes, also the "else" part supports the braces {}. But keep in
mind the braces don't create a scope for the names.
Bye,
bearophile