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digitalmars.D.learn - Voldemort type for mixin template.

reply ChangLong <changlon gmail.com> writes:
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;
}
Jan 11
parent reply aliak <something something.com> writes:
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
Jan 11
parent ChangLong <changlon gmail.com> writes:
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)
Jan 11