Re: Voldemort type for mixin template.

[ChangLong via Digitalmars-d-learn]

On Thursday, 11 January 2018 at 21:30:43 UTC, aliak wrote:
On Thursday, 11 January 2018 at 08:56:11 UTC, ChangLong wrote:
When I try add some sub type for struct with mixin template, 
seems there is no way to hidden the private type.

Is there a way to hidden type from mix template like Voldemort 
type ?

fake code:

mix template TypeX () {
    alias This = typeof(this);

    static struct Unique {
       This* _ptr ;
    }
    static struct Helper {
          private Unique data;
     }
     alias TypeX = {
         alias PublicName = Helper ;
     }
}

struct Node {
    mixin TypeX!();
    PublicName helper;
}

Hi, can you explain a bit more? The question is not entirely 
clear to me. Can you mixin a struct of type PublicName and just 
hide everything in there?

mixin template TypeX() {
    struct PublicName {
        private alias This = typeof(this);
        private struct Unique {
                        This* _ptr;
                }
        private Unique _data;
        alias _data this;
    }
}

void main(string[] args) {
    mixin TypeX;
    PublicName helper;
    helper._ptr.writeln;
}

Cheers

If PublicName is complex type,  require  has some private type 
information.  there is noway to hidden the private type from the 
scope of mixin.  the purpose is hidden helper._ptr from main 
function to avoid name conflict.

I try use mixin fo modify struct to allow it has some kind zero 
cost abstract, or memory manage function.    since the system is 
complex it will import a lot symbol into the class.

I has to put the mix template into struct, since I has to add 
member with type from mix template.  and I also want to avoid 
access ref_count from the struct body(and a lot other name 
conflict)