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From: "snoopysalive" <matthias.kistler@gmx.de>
Newsgroups: comp.lang.ada
Subject: Re: How to use associative arrays in Ada 2005?
Date: 23 Nov 2006 11:27:31 -0800
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Date: 2006-11-23T11:27:31-08:00
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Hi!

First: @Matt: Thank you for the pdf. It's really useful, but I couldn't
write you back because of the email filter.

And now, my next question: How to handle "hashes of hashes" in Ada?
Here's the code which should contain a package representing a hash of a
hash:

-- Here, the code begins
with Ada.Text_IO,
     Ada.Strings.Hash,
     Ada.Containers.Indefinite_Hashed_Maps;
use  Ada.Text_IO,
     Ada.Strings,
     Ada.Containers;

procedure book is
    package Str_Int_Maps is
        new Ada.Containers.Indefinite_Hashed_Maps
            (String,
             Integer,
             Ada.Strings.Hash,
             "=");
    use Str_Int_Maps;
    package Str_Map_Maps is
        new Ada.Containers.Indefinite_Hashed_Maps
            (String,
             Str_Int_Maps.Map,
             Ada.Strings.Hash,
             "=");

    Ages : Str_Map_Maps.Map; -- That's the "hash of a hash"

begin
    Ages.Insert("family name",Insert("name",23));
end book;
-- Here, the code ends


The statement "Ages.Insert("family name",Insert("name",23));" doesn't
work. So, how is it possible to do something like this in C++:
"...
map<string, map<string,int>> ages;
ages["family name"]["name"] = 23;
..."

Thank you and greetings,
Matthias