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extern opaque struct
Aug 23, 2015
John Colvin
Aug 23, 2015
John Colvin
Aug 24, 2015
Daniel Murphy
Aug 24, 2015
John Colvin
Aug 24, 2015
Artur Skawina
August 23, 2015
Gravatar of John ColvinPosted by John ColvinReply
John Colvin
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Let's say I have some C headers that have code like this in:

extern struct UndeclaredStruct blah;
Undeclared *p = &blah;

which would naïvely translate to D as:

struct UndeclaredStruct;
extern UndeclaredStruct blah;
auto p = &blah;

which doesn't compile. Why not? Neither the size nor any default initialiser is needed.
August 23, 2015
Gravatar of John ColvinPosted by John Colvin
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John Colvin
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On Sunday, 23 August 2015 at 22:20:26 UTC, John Colvin wrote:
> Let's say I have some C headers that have code like this in:
>
> extern struct UndeclaredStruct blah;
> Undeclared *p = &blah;
>
> which would naïvely translate to D as:
>
> struct UndeclaredStruct;
> extern UndeclaredStruct blah;
> auto p = &blah;
>
> which doesn't compile. Why not? Neither the size nor any default initialiser is needed.

s/Undeclared /UndeclaredStruct/
August 24, 2015
Gravatar of Daniel MurphyPosted by Daniel Murphy
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"John Colvin"  wrote in message news:uhpgjffttsuqeswyjtam@forum.dlang.org...

> Let's say I have some C headers that have code like this in:
>
> extern struct UndeclaredStruct blah;
> Undeclared *p = &blah;
>
> which would naïvely translate to D as:
>
> struct UndeclaredStruct;
> extern UndeclaredStruct blah;
> auto p = &blah;
>
> which doesn't compile. Why not? Neither the size nor any default initialiser is needed.

It should work, please file in bugzilla.
August 24, 2015
Gravatar of Artur SkawinaPosted by Artur Skawina
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On 08/24/15 00:20, John Colvin via Digitalmars-d wrote:
> Let's say I have some C headers that have code like this in:
> 
> extern struct UndeclaredStruct blah;
> Undeclared *p = &blah;
> 
> which would naïvely translate to D as:
> 
> struct UndeclaredStruct;
> extern UndeclaredStruct blah;
> auto p = &blah;
> 
> which doesn't compile. Why not? Neither the size nor any default initialiser is needed.

Yeah; workaround (plus mangling and TLS fix):

   struct UndeclaredStruct {}
   extern extern (C) __gshared UndeclaredStruct blah;
   auto p = &blah;

artur
August 24, 2015
Gravatar of John ColvinPosted by John Colvin
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On Monday, 24 August 2015 at 04:08:28 UTC, Daniel Murphy wrote:
> "John Colvin"  wrote in message news:uhpgjffttsuqeswyjtam@forum.dlang.org...
>
>> Let's say I have some C headers that have code like this in:
>>
>> extern struct UndeclaredStruct blah;
>> Undeclared *p = &blah;
>>
>> which would naïvely translate to D as:
>>
>> struct UndeclaredStruct;
>> extern UndeclaredStruct blah;
>> auto p = &blah;
>>
>> which doesn't compile. Why not? Neither the size nor any default initialiser is needed.
>
> It should work, please file in bugzilla.

done: https://issues.dlang.org/show_bug.cgi?id=14954