Re: safety of move

[Dmitry Olshansky]

11/28/2012 7:19 AM, Ellery Newcomer пишет:
I find myself using [abusing?] move lately:
import std.algorithm;
import std.stdio;

struct A {
     const(int) i;
     int j;
     int k;
}

void main() {
     A* a = new A(); // pretend this is malloc or something
     // *a = A(1)
     A a2 = A(1);
     move(a2, *a);

     A[] arr = new A[](2);
     //arr[1] = *a;
     move(*a, arr[1]);
}

For the first part, I have a A* pointing to uninitialized memory and I
need to initialize it somehow.

emplace should work for constructing A in a given chunk of memory.

move works I guess because it uses memcpy
or something. Not complaining, but wondering.


Yes it hacks through const/immutable at ease. The only requirement seems 
that it has to be shallow immutable/cont.

The second part violates D's const semantics and maybe shouldn't be
permitted. But it is.

I agree.

--
Dmitry Olshansky