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digitalmars.D.learn - Class knowing its own Class

reply strtr <strtr sp.am> writes:
What is the pretty way to do something like this?

Class C
{
  private const char[] _name = "C";// demangling this.mangleof didn't work

  void makeNew()
  {
    mixin(`new `~_name~`();`); // the not so pretty part
  }
}
Jun 29 2010
next sibling parent reply "Steven Schveighoffer" <schveiguy yahoo.com> writes:
On Tue, 29 Jun 2010 17:59:37 -0400, strtr <strtr sp.am> wrote:

 What is the pretty way to do something like this?

 Class C
 {
   void makeNew()
   {
     new typeof(this);
   }
 }

As edited... -Steve
Jun 29 2010
parent reply strtr <strtr sp.am> writes:
== Quote from Steven Schveighoffer (schveiguy yahoo.com)'s article
 On Tue, 29 Jun 2010 17:59:37 -0400, strtr <strtr sp.am> wrote:
 What is the pretty way to do something like this?

 Class C
 {
   void makeNew()
   {
     new typeof(this);
   }
 }

-Steve

Whahaha! Thanks, I knew I was missing something here.
Jun 29 2010
parent Justin Spahr-Summers <Justin.SpahrSummers gmail.com> writes:
On Wed, 30 Jun 2010 22:59:50 +0200, Tomek Sowinski <just ask.me> wrote:
 
 Dnia 30-06-2010 o 00:13:28 strtr <strtr sp.am> napisal(a):
 
 == Quote from Steven Schveighoffer (schveiguy yahoo.com)'s article
 On Tue, 29 Jun 2010 17:59:37 -0400, strtr <strtr sp.am> wrote:
 What is the pretty way to do something like this?

 Class C
 {
   void makeNew()
   {
     new typeof(this);
   }
 }

-Steve

Whahaha! Thanks, I knew I was missing something here.

Interestingly, this works even if makeNew is static (as factory methods usually are). Don't know whether by design or by bug. If by the latter, please don't fix it ;) Tomek

Yep, it's intentional. It's explained in a rather hard-to-find spot: "There are three special cases: 1. typeof(this) will generate the type of what this would be in a non- static member function, even if not in a member function. 2. Analogously, typeof(super) will generate the type of what super would be in a non-static member function. 3. typeof(return) will, when inside a function scope, give the return type of that function." http://www.digitalmars.com/d/2.0/declaration.html#Typeof
Jun 30 2010
prev sibling parent =?iso-8859-2?B?VG9tZWsgU293afFza2k=?= <just ask.me> writes:
Dnia 30-06-2010 o 00:13:28 strtr <strtr sp.am> napisa=B3(a):

 =3D=3D Quote from Steven Schveighoffer (schveiguy yahoo.com)'s article=

 On Tue, 29 Jun 2010 17:59:37 -0400, strtr <strtr sp.am> wrote:
 What is the pretty way to do something like this?

 Class C
 {
   void makeNew()
   {
     new typeof(this);
   }
 }

-Steve

Whahaha! Thanks, I knew I was missing something here.

Interestingly, this works even if makeNew is static (as factory methods = = usually are). Don't know whether by design or by bug. If by the latter, = = please don't fix it ;) Tomek
Jun 30 2010