On Wednesday, 9 March 2016 at 02:14:34 UTC, Chris Wright wrote:
On Wed, 09 Mar 2016 01:18:26 +0000, maik klein wrote:
[...]
[...]
Rather, declaring a variable should never throw an exception.
Declaring a variable shouldn't create any nontrivial work.
It's trivial to create a type in D that doesn't have exception
free default construction:
class A {
this() { throw new Exception(); }
}
That is why I have limited it to `structs`, but I see that I have
used `every type` before which is just wrong. Not sure why I even
wrote it.
[...]
D has one explicit cast operator. It can do much of what
static_cast does, though D does not let you downcast without a
runtime check.
I should probably be more clear that this is about compile time.
[...]
You don't need the GC; you just need storage that's not on a
stack frame below where you're catching the exception.
You can malloc an exception and throw it.
You can allocate space for an exception in the static data
region and throw it from there, like with OutOfMemoryError.
You can allocate space for an exception on the stack in main()
and pass it down the call chain.
Thanks, I did not know this. Will fix it asap.
[...]
That's the canonical way of doing it, but with dub, I'm seeing
people generally adding the project name before that. So, for
instance, I have module "roguelike.levelgen" in source file
"source/levelgen.d". It works.
[...]
stringof evaluates an expression or type and produces a string
representation for that value. That string representation is a
compile- time constant. It doesn't print it at compile time or
runtime.
Does writeln print values at compile time? That would be kind
of strange. Maybe useful in the context of CTFE, but still a
little unexpected.
I should be more clear. I meant writeln for runtime printing and
pragma(msg) for compile time printing.
