Re: How do you deal with scoped allocations?

[Dmitry Olshansky]

08-Dec-2013 02:32, Namespace пишет:

Since my last thread doesn't get much attention I like to ask here: How
did you deal with temporary memory? Let's assume that the size is only
known at runtime.
I have this situation e.g. in Dgame in the capture method: I get the
pixel data from my Window with glReadPixel but it is reversed. So I have
to reverse it again, but I still need at least temporary memory for one
pixel-line which stores the currently swapped pixels. So how would you
solve such a situation?

Since D doesn't offer VLA's and alloca is broken (besides the ugly syntax),
I use a scoped wrapper (since scope doesn't do the job):

----
struct scoped(A : T[], T) {
     T[] arr;

     alias arr this;

     this(T[] arr) {
         this.arr = arr;

         writefln("Get %d %s's (ptr = %x)", arr.length, T.stringof,
arr.ptr);
     }

     ~this() {
         GC.free(this.arr.ptr);
         this.arr = null;
         GC.minimize();

This is slow. Just use malloc & free, why touch GC at all?

     }
}

void main() {
     // need temp memory
     scoped!(int[]) arr = new int[n];
}
----

And what do you use?

--
Dmitry Olshansky