• "Tyro[a.c.edwards]" <nospam home.com> Apr 15 2009
• novice2 <sorry noem.ail> Apr 15 2009
• Daniel Keep <daniel.keep.lists gmail.com> Apr 15 2009
• bearophile <bearophileHUGS lycos.com> Apr 15 2009
• grauzone <none example.net> Apr 15 2009

"Tyro[a.c.edwards]" <nospam home.com> writes:

Is it yet possible to statically initialize an associative array? If so, 
please point me to the documentation. I am using DMD v2.028.

Currently I'm able to do this:

import std.stdio;

string[string] types;
static this(){
     types = [ "void":"void", "bool":"bool" ];
}

void main(){
     writeln(types);
}

Output = [void:void,bool:bool] which is exactly what I want.

However, removing static this() results in an error.

string[string] types = [ "void":"void", "bool":"bool" ];

Result:
api.d(77): Error: non-constant expression ["void":"void","bool":"bool"]

How do I make the initialization constant?

Thanks,
Andrew

novice2 <sorry noem.ail> writes:

may be you can raplace string with char[] ?

Daniel Keep <daniel.keep.lists gmail.com> writes:

Tyro[a.c.edwards] wrote:
 Is it yet possible to statically initialize an associative array? If so,
 please point me to the documentation. I am using DMD v2.028.
 
 Currently I'm able to do this:
 
 import std.stdio;
 
 string[string] types;
 static this(){
     types = [ "void":"void", "bool":"bool" ];
 }
 
 void main(){
     writeln(types);
 }
 
 Output = [void:void,bool:bool] which is exactly what I want.
 
 However, removing static this() results in an error.
 
 string[string] types = [ "void":"void", "bool":"bool" ];
 
 Result:
 api.d(77): Error: non-constant expression ["void":"void","bool":"bool"]
 
 How do I make the initialization constant?
 
 Thanks,
 Andrew


I think Walter said something a while back to the effect that making it
possible to statically initialise AAs isn't feasible because it requires
setting up a complex structure on the heap.  The best you could do would
be to *pretend* to statically initialise them, and actually really
initialise them in a module ctor.

Which is exactly what you currently have to do.

Could be wrong; that's just what I remember from the last time this came up.

  -- Daniel

bearophile <bearophileHUGS lycos.com> writes:

Daniel Keep:
 I think Walter said something a while back to the effect that making it
 possible to statically initialise AAs isn't feasible because it requires
 setting up a complex structure on the heap.


At the moment you can't statically initialize a built-in AA in D.
But with a small change in D AAs such memory may be allocated statically too,
when the program starts. What's the advantage of doing this? Having quicker
startup times?

Bye,
bearophile

grauzone <none example.net> writes:

  What's the advantage of doing this? Having quicker startup times?



Syntax. Read the first post of this thread.