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digitalmars.D - free method again, treat class as name space only

reply davidl <davidl 126.com> writes:
class A
{
    void func(){ writefln("hello"); }
}

class B
{
    void func(){ A.func(cast(A)cast(void*)this); }  // sometimes people  
need this.
}

partial class is good, but it's likely to introduce a lot compiler bugs,  
and it's likely to increase the compile time.

multiple inheritance is also nice, also likely to introduce compiler bugs,  
and multiple inheritance
make the thing more obscure sometimes, while it needs to be clear.

the solution I proposed is simple and compact. It can solve all what  
partial class & MI can solve.
It won't much bring bad taste in syntax.



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Aug 07 2008
parent reply Lionello Lunesu <lio lunesu.remove.com> writes:
davidl wrote:

 class A
 {
    void func(){ writefln("hello"); }
 }
 
 class B
 {
    void func(){ A.func(cast(A)cast(void*)this); }  // sometimes people 
 need this.
 }
 
 partial class is good, but it's likely to introduce a lot compiler bugs, 
 and it's likely to increase the compile time.
 
 multiple inheritance is also nice, also likely to introduce compiler 
 bugs, and multiple inheritance
 make the thing more obscure sometimes, while it needs to be clear.
 
 the solution I proposed is simple and compact. It can solve all what 
 partial class & MI can solve.
 It won't much bring bad taste in syntax.


What about a static function in a class? Isn't that basically "treating 
class as name space only"?

L.
Aug 07 2008
parent reply davidl <davidl 126.com> writes:
在 Thu, 07 Aug 2008 21:35:41 +0800，Lionello Lunesu  
<lio lunesu.remove.com> 写道:


 davidl wrote:

 class A
 {
    void func(){ writefln("hello"); }
 }
  class B
 {
    void func(){ A.func(cast(A)cast(void*)this); }  // sometimes people  
 need this.
 }
  partial class is good, but it's likely to introduce a lot compiler  
 bugs, and it's likely to increase the compile time.
  multiple inheritance is also nice, also likely to introduce compiler  
 bugs, and multiple inheritance
 make the thing more obscure sometimes, while it needs to be clear.
  the solution I proposed is simple and compact. It can solve all what  
 partial class & MI can solve.
 It won't much bring bad taste in syntax.


 What about a static function in a class? Isn't that basically "treating  
 class as name space only"?

 L.


That can't do what MI do.

While the way I proposed can. Because you send the `this` pointer in



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Aug 08 2008
parent Ary Borenszweig <ary esperanto.org.ar> writes:
davidl a écrit :

 在 Thu, 07 Aug 2008 21:35:41 +0800，Lionello Lunesu 
 <lio lunesu.remove.com> 写道:
 

 davidl wrote:

 class A
 {
    void func(){ writefln("hello"); }
 }
  class B
 {
    void func(){ A.func(cast(A)cast(void*)this); }  // sometimes 
 people need this.
 }
  partial class is good, but it's likely to introduce a lot compiler 
 bugs, and it's likely to increase the compile time.
  multiple inheritance is also nice, also likely to introduce compiler 
 bugs, and multiple inheritance
 make the thing more obscure sometimes, while it needs to be clear.
  the solution I proposed is simple and compact. It can solve all what 
 partial class & MI can solve.
 It won't much bring bad taste in syntax.


 What about a static function in a class? Isn't that basically 
 "treating class as name space only"?

 L.


 
 That can't do what MI do.
 
 While the way I proposed can. Because you send the `this` pointer in


Can you give a good example where the thing you want to do is useful? I 
see it as a hack into the OO system.
Aug 08 2008