I have been testing/configuring a UML tool to generate D classes/files when I came across D's class attributes scope and final. I wondered if D classes have other attributes like public, private, protected. So I tried it and tested some D source codes. Here is one that I tried:

private protected public class A {
    public this() { }
}

void main() {
    auto a = new A();
}

This code was successfully compiled using dmd 1.021 without errors or warnings, much to my surprise. Could anyone please tell me why is this so?

-- 
negerns

negerns wrote:
> I have been testing/configuring a UML tool to generate D classes/files when I came across D's class attributes scope and final. I wondered if D classes have other attributes like public, private, protected. So I tried it and tested some D source codes. Here is one that I tried:
> 
> private protected public class A {
>     public this() { }
> }
> 
> void main() {
>     auto a = new A();
> }
> 
> This code was successfully compiled using dmd 1.021 without errors or warnings, much to my surprise. Could anyone please tell me why is this so?

You're certainly not the first one to ask.  :-)

First off protection attributes don't apply within a module.  Everything in one file has access to everything else.   D doesn't have C++'s "friend" so that's sort of D's substitute.

Second, the compiler is overly permissive about mixed attributes.  I think there are bugs on file for it.  But fixing it is low priority since the amount of harm it causes is small.

--bb

module test;
import std.stdio;

private protected public public private public private protected public
protected public private protected private public public private protected
protected private class T {
 this(char[] msg) {
  writefln(msg);
 }
}

void main() {
 T t = new T("This works too :)");
}


"Bill Baxter" <dnewsgroup@billbaxter.com> wrote in message news:fe4tra$2bgd$1@digitalmars.com...
> negerns wrote:
>> I have been testing/configuring a UML tool to generate D classes/files when I came across D's class attributes scope and final. I wondered if D classes have other attributes like public, private, protected. So I tried it and tested some D source codes. Here is one that I tried:
>>
>> private protected public class A {
>>     public this() { }
>> }
>>
>> void main() {
>>     auto a = new A();
>> }
>>
>> This code was successfully compiled using dmd 1.021 without errors or warnings, much to my surprise. Could anyone please tell me why is this so?
>
> You're certainly not the first one to ask.  :-)
>
> First off protection attributes don't apply within a module.  Everything in one file has access to everything else.   D doesn't have C++'s "friend" so that's sort of D's substitute.
>
> Second, the compiler is overly permissive about mixed attributes.  I think there are bugs on file for it.  But fixing it is low priority since the amount of harm it causes is small.
>
> --bb

Simen Haugen wrote:
> module test;
> import std.stdio;
> 
> private protected public public private public private protected public
> protected public private protected private public public private protected
> protected private class T {
>  this(char[] msg) {
>   writefln(msg);
>  }
> }
> 
> void main() {
>  T t = new T("This works too :)");
> }

In an ideal world, compiling the above would produce:

Error test.d:4: programmer is being a smartass.

:3

	-- Daniel