Static constructors in structs.

[BBasile via Digitalmars-d-learn]

On Friday, 30 October 2015 at 21:29:22 UTC, BBasile wrote:
> On Friday, 30 October 2015 at 20:58:37 UTC, anonymous wrote:
>> On 30.10.2015 21:23, TheFlyingFiddle wrote:
>>> Is this intended to work?
>>>
>>> struct A
>>> {
>>>     __gshared static this()
>>>     {
>>>        //Add some reflection info to some global stuff.
>>>        addReflectionInfo!(typeof(this));
>>>     }
>>> }
>>>
>>> I just noticed this works in 2.069, is this intended?
>>
>> static constructors are supposed to work, yes.
>>
>> The description is on the class page: 
>> http://dlang.org/class.html#static-constructor
>>
>> __gshared doesn't do anything there, though. Use `shared 
>> static this` instead, if you want the constructor to run only 
>> once per process, and not once per thread.
>
> __gshared is mostly usefull on fields (eg public uint a) 
> because it prevents a data to be put on the TLS, which in 
> certain case reduces the perfs up to 30%. The byte code using a 
> global variable that's not __gshared can be incredibly slower !

Im' talking about DMD win32 BTW. Even if now I've switched to 
full time linux, I have a test on the hold HDD that demonstrates 
this :). That's really uncredible. Avoid TLS as possible on DMD 
with the switch "-vtls".