Re: Non-hacky method to take list of keys as parameter?

[Anton Ottosson]

Thank you so much for your help; I finally got it to work! I think what was happening the first time around was that there was actually a `pmt` runtime issue that I misinterpreted as being an issue with the type conversion when going from Python to C++. But it turns out that it was actually due to me calling `pmt::nth` with a vector, when it is in fact only valid for lists, in a different part of the code. I suppose the compiler has no way of knowing the underlying types when it comes to `pmt`s, so errors like that are not caught during compile time.

Best,

Anton

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From: Anton Ottosson
Sent: Friday, July 16, 2021 12:08:42 AM
To: discuss-gnuradio@gnu.org
Subject: Re: Non-hacky method to take list of keys as parameter?

 

Oh, sorry! I meant Marcus, of course, not "Amrcus".

Best,

Anton

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From: Anton Ottosson
Sent: Friday, July 16, 2021 12:07:47 AM
To: discuss-gnuradio@gnu.org
Subject: Re: Non-hacky method to take list of keys as parameter?

 

Hi Amrcus,
Your first example would be ideal, but I seem to remember trying that and having issues with it, probably due to the implicit type conversion from Python to C++. I will try again, but is there anywhere one can look up what the conversions are?

Best regards,

Anton

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From: Marcus Müller <mmueller@gnuradio.org>
Sent: Thursday, July 15, 2021 11:54:00 PM
To: discuss-gnuradio@gnu.org
Cc: Anton Ottosson
Subject: Re: Non-hacky method to take list of keys as parameter?

 

Just use `dtype: raw` in the YAML file; then anything that's valid python goes!

For example `["key1", "key2"]`,
 but also other things like dicts, `{ "key1": 42, "key2": 1337 }`.

Best regards,
Marcus

On 15.07.21 06:58, Anton Ottosson wrote:
> Hi,
>
> I'm writing a block for an OOT module and I would like to take a list of keys as one of
> the parameters. They will be used to select entries in a pmt dictionary. I first tried to
> use std::vector<std::string> as the parameter type, but there doesn't seem to exist any
> corresponding string_vector dtype to use in the YAML file
> (https://wiki.gnuradio.org/index.php/YAML_GRC
> <https://wiki.gnuradio.org/index.php/YAML_GRC>). I then switched over to pmt arguments and
> managed to get it to work, but it is very ugly and hacky. This is the kind of thing I have
> to enter into the parameter field on the block:
>
>
> pmt.list2(pmt.intern("key1"), pmt.intern("key2"))
>
>
> Is there a better way? Is there a block that does something similar that I can take a look
> at? Best I could find was PDU Filter, but it only takes a single key, not a list.
>
>
> Best regards,
>
> Anton
>