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How to work with optional fields [message #1731771]

Tue, 10 May 2016 06:10

Johannes Bro

Messages: 56
Registered: June 2015

Member

Hi All,

I want to implement a test port which can handle a record with optional fields. I try to explain my question on a easy example.


type record AnyField{
       octetstring  FirstSubfield,
       octetstring  SecondSubfield
}   

type record AnyHeader {
        integer accessNumber,
        AnyField dummyField optional,
}

If I now create the respective C++ classes with the titan compiler. The Class AnyField do not have methods to fill the fields (FirstSubfield, SecondSubfield) with values. There is only a constructor to give all values at once. But this is in my case not possible. Is there any other possibility to fill step by step ?

I thought maybe the *_template classes can help me. I tried to fill first a object of them and give finaly the template object to the object of AnyHeader. But it does't work...
What is the aim/task of all this *_template classes ?

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Re: How to work with optional fields [message #1731773 is a reply to message #1731771]

Tue, 10 May 2016 06:26

Kristof Szabados

Messages: 60
Registered: July 2015

Member

Hi Johannes,

If you have a function with such a statement in TTCN-3:
"var AnyField example;
example.FirstSubfield := ''O
"

It will be translated to C++ as:
"
AnyField example;
example.FirstSubfield() = os_0;
"

Where "os_0" is the OCTETSTRING to be assigned.

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Re: How to work with optional fields [message #1731775 is a reply to message #1731773]

Tue, 10 May 2016 06:47

Johannes Bro

Messages: 56
Registered: June 2015

Member

Please take a look to my attached files and give me a concrete example.

c++:

AnyHeader myHeader;

/* Fill the field step by step*/
.....

Attachment: TypesAnyHeader.cc
(Size: 2.73KB, Downloaded 121 times)
Attachment: TypesAnyHeader.hh
(Size: 7.59KB, Downloaded 76 times)

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Re: How to work with optional fields [message #1731784 is a reply to message #1731775]

Tue, 10 May 2016 07:31

Kristof Szabados

Messages: 60
Registered: July 2015

Member

There are 2 ways to going about this in general.
1) You can replicate a structured form of assigning value (which is slightly faster in runtime).
For example this TTCN-3 code
"
var AnyHeader MyHeader;
MyHeader := {
accessNumber := 1,
dummyField := {
FirstSubfield := ''O,
SecondSubfield := ''O
}
}
"
can be replicated in C++ as:
"
AnyHeader MyHeader;
MyHeader.accessNumber() = 1;
{
AnyField& tmp_1 = MyHeader.dummyField();
tmp_1.FirstSubfield() = os_0;
tmp_1.SecondSubfield() = os_0;
}
"

2) You can fill in the structure field-by-field.
This can be done in TTCN-3 like this:
"
MyHeader.accessNumber := 1;
MyHeader.dummyField.FirstSubfield := ''O;
MyHeader.dummyField.SecondSubfield := ''O;
"

Which can be replicated in C++ as:
"
MyHeader.accessNumber() = 1;
MyHeader.dummyField()().FirstSubfield() = os_0;
MyHeader.dummyField()().SecondSubfield() = os_0;
"

Please see the extra "()" needed to resolve optional fields

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Re: How to work with optional fields [message #1731791 is a reply to message #1731784]

Tue, 10 May 2016 08:16

Johannes Bro

Messages: 56
Registered: June 2015

Member

Quote:

Please see the extra "()" needed to resolve optional fields

Exactly this was my mistake, sorry... Embarrassed

I found it now in the documentation.

Thank you very much !

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Re: How to work with optional fields [message #1731803 is a reply to message #1731791]

Tue, 10 May 2016 09:38

Elemer Lelik

Messages: 1120
Registered: January 2015

Senior Member

Hi Johannes,

something entirely different:
as far as remember, you have been working on a test port for serial protocol.
This might be interesting for others too, so in case you finalized it, would you consider to contribute it to the Titan project?

Let me know if the answer is positive

Best regards
Elemer

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Re: How to work with optional fields [message #1731807 is a reply to message #1731791]

Tue, 10 May 2016 09:45

Johannes Bro

Messages: 56
Registered: June 2015

Member

Hi Elemer,

it's not finished yet but so far I can contribute something what can helpful for the community, you will hear from me.

One more question:
What happens with fields which have omit as value if you encode these with the build in *.encode(....) function in to RAW ? Will these fields be skipped or just have zeros ?

[Updated on: Tue, 10 May 2016 09:54]

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