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digitalmars.D.learn - associative array of associative arrays.

reply dcoder <dcoder devnull.dev> writes:
Hello.  How do you declare and initialize a map that looks like the following:

Name => [ Personal Info]

Where personal info is type string[string].

I can't get this to compile.  I'm wondering what I am doing wrong:

import std.stdio;


void main() {
  int[string] helloworld = [ "Hello":0, "World":1 ];



  foreach( k,v;helloworld) {
    writefln( "%s -> %s", k, v);
  }


  writefln( "helloworld type: %s", typeid(helloworld));


  string[string] table = [ "City":"Boston", "Title":"Vice President" ];

  foreach( k, v; table) {
    writefln( "%s: %s", k, v);
  }

  // Here's the problem:
  string[string[string]] leaders = [ "Obama":["City":"DC", "Title":"ThePrez"],
				    "Cameron":["City":"London", "Title":"DaPrimeMinista"]];

  foreach( k, v; leaders) {
    writefln( "first foreach type: %s", typeid(v));
    writefln( "Person: %s", k);
    foreach( kk, vv; v) {
      writefln( "\t%s\t%s", kk, vv);
    }
  }

  return;
}



Here's the output:


$ dmd AssocArray.d
AssocArray.d(25): Error: Integer constant expression expected instead of "City"
AssocArray.d(25): Error: Integer constant expression expected instead of "Title"
AssocArray.d(25): Error: Integer constant expression expected instead of "City"
AssocArray.d(25): Error: Integer constant expression expected instead of "Title"
AssocArray.d(24): Error: not an associative array initializer




$ dmd --help
Digital Mars D Compiler v2.047
Copyright (c) 1999-2010 by Digital Mars written by Walter Bright
Documentation: http://www.digitalmars.com/d/2.0/index.html




thanks

dcoder
Aug 12 2010
next sibling parent reply dennis luehring <dl.soluz gmx.net> writes:
Am 13.08.2010 01:17, schrieb dcoder:

string[string][string] leaders

or try using alias to "see" the light

alias string[string] city_info;

city_info[string] leaders;

 Hello.  How do you declare and initialize a map that looks like the following:

 Name =>  [ Personal Info]

 Where personal info is type string[string].

 I can't get this to compile.  I'm wondering what I am doing wrong:

 import std.stdio;


 void main() {
    int[string] helloworld = [ "Hello":0, "World":1 ];



    foreach( k,v;helloworld) {
      writefln( "%s ->  %s", k, v);
    }


    writefln( "helloworld type: %s", typeid(helloworld));


    string[string] table = [ "City":"Boston", "Title":"Vice President" ];

    foreach( k, v; table) {
      writefln( "%s: %s", k, v);
    }

    // Here's the problem:
    string[string[string]] leaders = [ "Obama":["City":"DC", "Title":"ThePrez"],
 				    "Cameron":["City":"London", "Title":"DaPrimeMinista"]];

    foreach( k, v; leaders) {
      writefln( "first foreach type: %s", typeid(v));
      writefln( "Person: %s", k);
      foreach( kk, vv; v) {
        writefln( "\t%s\t%s", kk, vv);
      }
    }

    return;
 }



 Here's the output:


 $ dmd AssocArray.d
 AssocArray.d(25): Error: Integer constant expression expected instead of "City"
 AssocArray.d(25): Error: Integer constant expression expected instead of
"Title"
 AssocArray.d(25): Error: Integer constant expression expected instead of "City"
 AssocArray.d(25): Error: Integer constant expression expected instead of
"Title"
 AssocArray.d(24): Error: not an associative array initializer




 $ dmd --help
 Digital Mars D Compiler v2.047
 Copyright (c) 1999-2010 by Digital Mars written by Walter Bright
 Documentation: http://www.digitalmars.com/d/2.0/index.html




 thanks

 dcoder

Aug 12 2010
parent dcoder <dcoder devnull.dev> writes:
== Quote from dennis luehring (dl.soluz gmx.net)'s article
 Am 13.08.2010 01:17, schrieb dcoder:
 string[string][string] leaders
 or try using alias to "see" the light
 alias string[string] city_info;
 city_info[string] leaders;

Ah, thanks. string[string[string]] maps type string[string] as key to string, which is the reverse of what I want. I want to map string to string[string]. So, anyways, I did make the change, but my initialization still doesn't work. I get the same errors: $ dmd AssocArray.d AssocArray.d(25): Error: Integer constant expression expected instead of "City" AssocArray.d(25): Error: Integer constant expression expected instead of "Title" AssocArray.d(25): Error: Integer constant expression expected instead of "City" AssocArray.d(25): Error: Integer constant expression expected instead of "Title" AssocArray.d(24): Error: not an associative array initializer Why? And why would I get the same kind of error? thanks.
 Hello.  How do you declare and initialize a map that looks like the following:

 Name =>  [ Personal Info]

 Where personal info is type string[string].

 I can't get this to compile.  I'm wondering what I am doing wrong:

 import std.stdio;


 void main() {
    int[string] helloworld = [ "Hello":0, "World":1 ];



    foreach( k,v;helloworld) {
      writefln( "%s ->  %s", k, v);
    }


    writefln( "helloworld type: %s", typeid(helloworld));


    string[string] table = [ "City":"Boston", "Title":"Vice President" ];

    foreach( k, v; table) {
      writefln( "%s: %s", k, v);
    }

    // Here's the problem:
    string[string[string]] leaders = [ "Obama":["City":"DC", "Title":"ThePrez"],
 				    "Cameron":["City":"London", "Title":"DaPrimeMinista"]];

    foreach( k, v; leaders) {
      writefln( "first foreach type: %s", typeid(v));
      writefln( "Person: %s", k);
      foreach( kk, vv; v) {
        writefln( "\t%s\t%s", kk, vv);
      }
    }

    return;
 }



 Here's the output:


 $ dmd AssocArray.d
 AssocArray.d(25): Error: Integer constant expression expected instead of "City"
 AssocArray.d(25): Error: Integer constant expression expected instead of
"Title"
 AssocArray.d(25): Error: Integer constant expression expected instead of "City"
 AssocArray.d(25): Error: Integer constant expression expected instead of
"Title"
 AssocArray.d(24): Error: not an associative array initializer




 $ dmd --help
 Digital Mars D Compiler v2.047
 Copyright (c) 1999-2010 by Digital Mars written by Walter Bright
 Documentation: http://www.digitalmars.com/d/2.0/index.html




 thanks

 dcoder


Aug 13 2010
prev sibling parent Pelle <pelle.mansson gmail.com> writes:
On 08/13/2010 01:17 AM, dcoder wrote:
 Hello.  How do you declare and initialize a map that looks like the following:

 Name =>  [ Personal Info]

 Where personal info is type string[string].

 I can't get this to compile.  I'm wondering what I am doing wrong:

 import std.stdio;


 void main() {
    int[string] helloworld = [ "Hello":0, "World":1 ];



    foreach( k,v;helloworld) {
      writefln( "%s ->  %s", k, v);
    }


    writefln( "helloworld type: %s", typeid(helloworld));


    string[string] table = [ "City":"Boston", "Title":"Vice President" ];

    foreach( k, v; table) {
      writefln( "%s: %s", k, v);
    }

    // Here's the problem:
    string[string[string]] leaders = [ "Obama":["City":"DC", "Title":"ThePrez"],
 				    "Cameron":["City":"London", "Title":"DaPrimeMinista"]];

    foreach( k, v; leaders) {
      writefln( "first foreach type: %s", typeid(v));
      writefln( "Person: %s", k);
      foreach( kk, vv; v) {
        writefln( "\t%s\t%s", kk, vv);
      }
    }

    return;
 }



 Here's the output:


 $ dmd AssocArray.d
 AssocArray.d(25): Error: Integer constant expression expected instead of "City"
 AssocArray.d(25): Error: Integer constant expression expected instead of
"Title"
 AssocArray.d(25): Error: Integer constant expression expected instead of "City"
 AssocArray.d(25): Error: Integer constant expression expected instead of
"Title"
 AssocArray.d(24): Error: not an associative array initializer




 $ dmd --help
 Digital Mars D Compiler v2.047
 Copyright (c) 1999-2010 by Digital Mars written by Walter Bright
 Documentation: http://www.digitalmars.com/d/2.0/index.html




 thanks

 dcoder

This is probably a bug, I think I have run into it. Try this: string[string[string]] leaders; leaders["Obama"] = ["City":"DC", "Title":"ThePrez"]; leaders["Cameron"] = ["City":"London", "Title":"DaPrimeMinista"]; And if that doesn't work, try unfolding more :-) Probably should report this as a bug, as well.
Aug 13 2010