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[C++ Gen] Is there a way to initialize a slot with a defining feature of multiplicity * ? [message #1849263]

Mon, 10 January 2022 14:36

Yoann Farré

Messages: 230
Registered: November 2017

Senior Member

Hello,

I would use the mechanism of slot in the deployment plan to init a property that has a multiplicity *. Unfortunately, by setting several values (Literal String) to the slot (see joined picture), I just get the override of the property value.

Component
    std::vector<String> config;
    ....

BootLoader
BootLoader::init() {
	component.config = "key1:value1";
	component.config = "key2:value2";
        component.run();
}

It results in a build error of course but I would know if there is a proper way to init such property or if I have to use a workaround?

Regards.
Yoann.

Attachment: slot.png
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Re: [C++ Gen] Is there a way to initialize a slot with a defining feature of multiplicity * ? [message #1849266 is a reply to message #1849263]

Mon, 10 January 2022 17:01

Ed Willink

Messages: 7503
Registered: July 2009

Senior Member

Hi

The Eclipse EMF / UML2 tooling often uses a pragmatism that -1 denotes * as the upperbound so for a [*] multiplicity try [0..-1].

Regards

Ed Willink

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Re: [C++ Gen] Is there a way to initialize a slot with a defining feature of multiplicity * ? [message #1849267 is a reply to message #1849263]

Mon, 10 January 2022 17:03

Carsten Pitz

Messages: 435
Registered: May 2015
Location: Germany

Senior Member

Hi Joann,

I am no C++ expert at all, but what about?

BootLoader::init() {
        auto it = component.config.begin();
	component.config.insert(it++, "key1:value1");
	component.config.insert(it++, "key2:value2");
        component.run();
}

/Carsten

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Re: [C++ Gen] Is there a way to initialize a slot with a defining feature of multiplicity * ? [message #1849283 is a reply to message #1849267]

Tue, 11 January 2022 09:14

Yoann Farré

Messages: 230
Registered: November 2017

Senior Member

Hello,

I think the multiplicity is well managed by the code generator for the property as a vector is generated for the property "config". I would expect something which looks like what you propose Carsten but it is not generated like this currently and I would know if it is an error of modeling or a missing feature in the code generator.
Yoann.

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Re: [C++ Gen] Is there a way to initialize a slot with a defining feature of multiplicity * ? [message #1849319 is a reply to message #1849283]

Wed, 12 January 2022 18:25

Carsten Pitz

Messages: 435
Registered: May 2015
Location: Germany

Senior Member

Hi Yoann,
I would vote for the issue is with the generator.
But this bias is more driven by feeling than by in depth analysis ;-)
/Carsten

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Re: [C++ Gen] Is there a way to initialize a slot with a defining feature of multiplicity * ? [message #1849356 is a reply to message #1849319]

Thu, 13 January 2022 15:34

Ansgar Radermacher

Messages: 375
Registered: March 2011
Location: Paris Saclay, France

Senior Member

Hi Yoann,

you're right, the C++ code generator currently does not properly support the initialization of a multi-valued attribute. One problem, is that this initialization code depends on the specific mapping which can be configured via the ListHint stereotype. Eventually, the hint also needs to provide information how to access an element. Feel free to create a bug.
In cases of a mapping to arrays, a workaround is the initialization with a single slot, e.g. "{ value1, value2, ... , valueN }". But this does not work for a mapping to std::vector, which needs an initialization in the constructor (vector<...> vect{ value1, value2, ... }) - there are many other ways to do it, of course.

Ansgar

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Re: [C++ Gen] Is there a way to initialize a slot with a defining feature of multiplicity * ? [message #1849357 is a reply to message #1849356]

Thu, 13 January 2022 15:41

Ansgar Radermacher

Messages: 375
Registered: March 2011
Location: Paris Saclay, France

Senior Member

[Updated on: Thu, 13 January 2022 15:44]

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Re: [C++ Gen] Is there a way to initialize a slot with a defining feature of multiplicity * ? [message #1849368 is a reply to message #1849357]

Fri, 14 January 2022 09:36

Yoann Farré

Messages: 230
Registered: November 2017

Senior Member

Hi,

Thanks for the answers. I understand the difficulty, it strongly depends on the chosen implementation of list. Nevertheless, I fill a bug to trace it. Bug578212

Regards.
Yoann.

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