On Thursday, 12 February 2015 at 23:27:51 UTC, Kitt wrote:
I'm currently trying to write a personal Associate Array class
that can be used in @nogc sections. Obviously, this means I'll
want to use malloc/free, however I'm not sure what the
"Correct" way to do this is. In a few places online I've seen
code for custom "_new" and "_delete" functions similar to this:
[code]
T _new(T, Args...) (Args args) {
size_t objSize;
static if(is (ValType == class))
objSize = __traits(classInstanceSize, T);
else
objSize = T.sizeof;
void* tmp = core.stdc.stdlib.malloc(objSize);
if (!tmp) throw new Exception("Memory allocation failed");
void[] mem = tmp[0..objSize];
T obj = emplace!(T, Args)(mem, args);
return obj;
}
void _delete(T)(T obj) {
clear(obj);
core.stdc.stdlib.free(cast(void*)obj);
}
[/code]
The Exception obviously uses the GC, and would need to be
replaced with a printf or something; however, emplace doesn't
have a @nogc replacement that I know of. What I'd like to know,
from people much more knowledgeable about the ins and outs of
D, is what the "Best" or "Correct" way to allocate and
deallocate within @nogc sections?
PS: Tangentially related, what hashing algorithm does D use?
I've seen people suggest using typeid(object).toHash(&object);
however, toHash isn't @nogc, so I need to write my own Hashing
function. For the sake of consistency and peace of mind, I'd
really like to match mine as closely to Ds internal one as
possible.
This is something I've done recently.
Would be glad if my code will help you:
https://github.com/Dgame/m3
Especially the m3.d module could be useful for you.
