Compile-Time std::map

[Jari-Matti Mäkelä]

NN wrote:
> I allways wanted to create std::map but in compile time.
> 
> The problem:
> I want to write smth like:
> int[int] x = {3:3,2:2,1:1}
> 
> But compiler will generate the following:
> int[int] x = {1:1,2:2,3:3}
> 
> Thus I can use binary search on x.
> 
> Is it possible to do in D ?
> Thanx.

Well, in case you didn't notice, DMD 1.014 now includes hash literals.
Assigning static hashes aren't yet supported directly, but you can do
simple cases like

  int val = ([1:11,2:22,3:33][1]);

Why does it need extra parenthesis - don't ask me.

Don and BCS showed how you can simulate assignment to a static variable
with

  char[][uint] symTable() { return [2u:"he",4:"ho",6:"hi"]; }

and

  char[][uint] symTable;
  static this() { symTable=[2u:"he",4:"ho",6:"hi"]; }

They both have some limitations.