Re: associative array with element type struct ?

[Paul via Digitalmars-d-learn]

Of course! And it's very common. <= lol


Thanks Ali.  Much appreciated!

Re: associative array with element type struct ?

[Ali Çehreli via Digitalmars-d-learn]

On 9/23/21 3:06 PM, Paul wrote:
> Can I have an associative array with the element type being a struct?

Of course! And it's very common. :)

> ...this
> 26  // simple dual tone key struct
> 27  struct keytones { ushort rowFreq; ushort colFreq; }
> 28
> 29  // keypad associative array
> 30  keytones[string] keypad;
> 31  keypad["1"].rowFreq = 697; keypad["1"].colFreq = 1209;
>
> gets this response from DMD compiler
>
> aaa.d(30): Error: undefined identifier `keypad`

I think you got that error from a different experiment because 'keypad' 
is clearly valid in that code. However, you are attempting to access 
members of a non-existing element: There is no element corresponding to 
"1" in the AA (yet).


There are multiple ways of populating an AA but I usually and simply 
assign an rvalue in such cases:


void main() {
  // simple dual tone key struct
  struct keytones { ushort rowFreq; ushort colFreq; }

  // keypad associative array
  keytones[string] keypad;
  keypad["1"] = keytones(697, 1209);
}

Ali

associative array with element type struct ?

[Paul via Digitalmars-d-learn]

Can I have an associative array with the element type being a 
struct?

..this
26  // simple dual tone key struct
27  struct keytones { ushort rowFreq; ushort colFreq; }
28
29  // keypad associative array
30  keytones[string] keypad;
31  keypad["1"].rowFreq = 697; keypad["1"].colFreq = 1209;

...gets this response from DMD compiler

aaa.d(30): Error: undefined identifier `keypad`
aaa.d(30): Error: declaration `aaa.main.keytones` is already 
defined

aaa.d(27):`struct` `keytones` is defined here

thanks for any assistance!