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digitalmars.D - :end to terminate attribute:

reply Mike Parker <aldacron gmail.com> writes:
Given

public:
Sep 28 2016
parent reply Mike Parker <aldacron gmail.com> writes:
Let's try this again.

This attribute block can be terminated by a corresponding 
protection attribute block:

// Begin private
private:
   void foo() {}

// End private
public:
    void bar() {}

But not all attributes have a corresponding attribute to turn 
them off:

// Begin  nogc
 nogc:
...

// End with scope/file

It would be a nice convenience to have something like this:

 nogc:

:end

Yes, I'm aware I could do this:

 nogc {}

But given the choice of : and {}, I'm tending to prefer the 
former these days. The lack of a way to turn off some attributes 
forces me to use {}. I recall discussions about something like 
 nogc(off) or some such. Was that ever approved? If not, I'd love 
to have something like :end, though I'm not attached to the name.
Sep 28 2016
parent reply ZombineDev <petar.p.kirov gmail.com> writes:
On Wednesday, 28 September 2016 at 09:43:38 UTC, Mike Parker 
wrote:

 Let's try this again.

 This attribute block can be terminated by a corresponding 
 protection attribute block:

 // Begin private
 private:
   void foo() {}

 // End private
 public:
    void bar() {}

 But not all attributes have a corresponding attribute to turn 
 them off:

 // Begin  nogc
  nogc:
 ...

 // End with scope/file

 It would be a nice convenience to have something like this:

  nogc:

 :end

 Yes, I'm aware I could do this:

  nogc {}

 But given the choice of : and {}, I'm tending to prefer the 
 former these days. The lack of a way to turn off some 
 attributes forces me to use {}. I recall discussions about 
 something like  nogc(off) or some such. Was that ever approved? 
 If not, I'd love to have something like :end, though I'm not 
 attached to the name.


AFAIR, last year or so, Andrei approved the proposal for 
attr(bool expr), eg:

 nogc:

// no gc code here

 nogc(false):

// code that's allowed to use the gc here

class Base(bool overridableImpl)
{
    final:


    final(overridableImpl) void impl() { /* ... */
}

But still no one has stepped in to do the implementation.
Sep 28 2016
next sibling parent ZombineDev <petar.p.kirov gmail.com> writes:
On Wednesday, 28 September 2016 at 09:48:27 UTC, ZombineDev wrote:

 On Wednesday, 28 September 2016 at 09:43:38 UTC, Mike Parker 
 wrote:

 [...]


 AFAIR, last year or so, Andrei approved the proposal for 
 attr(bool expr), eg:

  nogc:

 // no gc code here

  nogc(false):

 // code that's allowed to use the gc here

 class Base(bool overridableImpl)
 {
    final:


    final(overridableImpl) void impl() { /* ... */
 }

 But still no one has stepped in to do the implementation.


I meant:
class Base(bool overridableImpl)
{
    final:
    /* final methods here */

    final(!overridableImpl) void impl() { /* ... */ }

    /* final methods here */
}
Sep 28 2016
prev sibling next sibling parent reply Mike Parker <aldacron gmail.com> writes:
On Wednesday, 28 September 2016 at 09:48:27 UTC, ZombineDev wrote:


 AFAIR, last year or so, Andrei approved the proposal for 
 attr(bool expr), eg:


Yeah, that's what I couldn't remember. I'll dig up the discussion 
read up on it again.
Sep 28 2016
parent Seb <seb wilzba.ch> writes:
On Wednesday, 28 September 2016 at 10:14:25 UTC, Mike Parker 
wrote:

 Yeah, that's what I couldn't remember. I'll dig up the 
 discussion read up on it again.


These two DIPs drafts also try to tackle the attribute problem:

http://wiki.dlang.org/DIP64
http://wiki.dlang.org/DIP79
Sep 28 2016
prev sibling parent Andrei Alexandrescu <SeeWebsiteForEmail erdani.org> writes:
On 9/28/16 11:48 AM, ZombineDev wrote:

 AFAIR, last year or so, Andrei approved the proposal for attr(bool
 expr), eg:

  nogc:

 // no gc code here

  nogc(false):


Yah, we've got to have something. There's been quibbles over syntax but 
nothing better came up that is as comprehensive.  nogc(true) and 
generally  nogc(ctBoolean) should work as well. -- Andrei
Sep 28 2016