Hi,
I am trying to create a vector of pointers into another vector without much
luck. I would be happy if someone could tell me if this a good way to use
rust or if there is a better way to achieve a similar data structure or if
I am using the wrong language :-)
I have a vector of physical objects:
obj_vec = [ mut @obj1, @obj2, @obj3, ..., @objn ]
I will iterate through those objects and see which ones are close to each
other and I want to store a pointer/reference to those objects in a
separate vector:
obj_close_vec = [ &obj2, &obj3 ]
The objects in obj_close_vec will be investigated further and might be
updated.
I want to avoid making copies of the objects. It would be nice to be able
to allocate the obj_vec once (prefarably on the stack) and then manipulate
the objects through pointers/references.
Stack:
obj_vec obj_close_vec
[ [
obj1 |------ &obj2
|
obj2 <---------| |-- &obj3
|
obj3 <--------------| ]
...
objn
]
A small test program:
fn main() {
let x = @ mut 10;
let a = x;
*x = 3;
// Gives a=3, x=3 as I want.
io::println(fmt!("a: %d", *a) );
io::println(fmt!("x: %d", *x) );
// Same thing with vector elementsx
let mut v = @ mut [mut @1, @2];
let e = v[0];
// Does not work:
// error: assigning to dereference of immutable @ pointer
// *(v[0]) = 0;
io::println(fmt!("e: %d", *e) );
io::println(fmt!("x: %d", *v[0]) );
}
I have struggled with this (different variations of @ ~ vectors and dvec)
for far to long and would appreciate any comments.
Regards
Peter
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