Re: Move semantic and manuel memory management

[BigEpsilon]

Just an update on the question of pushing seqs in a double queue without copy.

I tried this: 
    
    
    import deques
    
    proc `<-`[T](lhs: var T, rhs: var T) {.noSideEffect, magic: "ShallowCopy".}
    
    type
        container[T] = object
            val: seq[T]
    
    proc `=`[T](d: var container[T], s: container[T]) =
        echo "copy"
        echo s.val
        d.val <- s.val
    
    var c = container[int](val: @[1, 2, 3])
    echo repr(c.val)
    echo cast[int](c.val[1].addr)
    var deque = initDeque[container[int]]()
    deque.addFirst(c)
    var c2 = deque.popFirst()
    echo repr(c2.val)
    echo cast[int](c2.val[1].addr)
    

But it does not work. I looked at the implementation of deque but I dont see 
from where comes the problem.

However I found an easier solution: 
    
    
    import deques
    
    type
        container[T] = ref object
            val: seq[T]
    
    var c = container[int](val: @[1, 2, 3])
    echo repr(c.val)
    echo cast[int](c.val[1].addr)
    var deque = initDeque[container[int]]()
    deque.addFirst(c)
    var c2 = deque.popFirst()
    echo repr(c2.val)
    echo cast[int](c2.val[1].addr)
    

Which works as I want.