Like this:

ubyte[] fun()
{
    ubyte[] str = cast(ubyte[])"hello world";
    ubyte[] by = Mallocator.instance.allocate(str.length);
    by[] = str[];
    return by[5..$];
}

void mian()
{
    ubyte[] aa = fun();
   // i want free the aa's momeny.
   //Mallocator.instance.deallocate(aa);// it is erro, aa.ptr != by.ptr?
 // can I get the by's ptr and length?
}


can I get "by" in main function by aa?
i can get the way?is it possible ？

On 03/30/2016 11:39 PM, Dsby wrote:
> Like this:
>
> ubyte[] fun()
> {
>      ubyte[] str = cast(ubyte[])"hello world";
>      ubyte[] by = Mallocator.instance.allocate(str.length);
>      by[] = str[];
>      return by[5..$];
> }
>
> void mian()
> {
>      ubyte[] aa = fun();
>     // i want free the aa's momeny.
>     //Mallocator.instance.deallocate(aa);// it is erro, aa.ptr != by.ptr?
>   // can I get the by's ptr and length?
> }
>
>
> can I get "by" in main function by aa?
> i can get the way?is it possible ？

No, you can't.

Normally, you would have a cleanup function that corresponds to fun(), which the users call when they're done with their resources.

void foo_cleanup(ubyte[] by) {
    // Do your magic here to find the original pointer.
    // For example, you can use an AA to map from
    // by.ptr to the original pointer.
}

Ali