CEP27: toolkit Snippet #297

bam241 · 2019-10-30T15:45:05Z

This is a suggestion to improve, ease and homogenize an the usage of toolkit capability in archetypes.

This idea is to limit as much as possible the need for implementation in a newly develop archetypes to avoid divergence in the implementation and the convention by providing a snippet that one can simply includes in the archetypes class definition header (inside the core definition of the class) to ensure variable name are identical.

Example can be found in:

Position implementation change cyclus#1510 for the snippet implementation
Update Position cycamore#502 for the corresponding archetypes implementations

gonuke

A bunch of editorial changes - I'm not sure I fully understand all the usage details, either.

source/cep/cep27.rst

gonuke · 2019-10-31T03:02:10Z

source/cep/cep27.rst

+2. Add the proper default initialisation of the variable required for the
+   snippet.
+
+3. In the ``Archetype::EnterNotify()``, assign the Snippet with value


Do you really assign the "Snippet" with a value???

bam241 · 2019-11-11T20:31:12Z

Cc @yarden-livnat

Co-Authored-By: Paul Wilson <[email protected]>

gonuke

This nearly there - thanks for the updates.

source/cep/cep27.rst

gonuke · 2019-11-21T23:43:06Z

source/cep/cep27.rst

+add characteristics to archetypes such as Position or Metadata, the actual
+implementation method is very verbose, where in each archetypes one needs to add
+the new specification in the arcehtype header, then assign it and use it in the
+cpp file, with no guarantee on the consistency in the variable naming and


This sentence kind of runs on... Maybe consider making it a couple of sentences.

source/cep/cep27.rst

Co-Authored-By: Paul Wilson <[email protected]>

source/cep/cep27.rst

gonuke · 2019-11-27T03:23:15Z

source/cep/cep27.rst

+        var1(0.0),
+        var2(0.0),
+        ...,
+        coordinates(0,0), //coordinates constructor (toolkit feature class)


This initializer is not necessary/valid because the snippet in this example doesn't include the coordinates variable.

gonuke · 2019-11-27T03:26:27Z

source/cep/cep27.rst

+--------------------
+``toolkit/my_snippet.cycpp.h``:
+.. highlight:: c
+    cyclus::toolkit::Position coordinates;


Is this only in the version without inheritance? Is this the only difference between the with and without?

it also changes in the implementation of the archetype

I mean the only difference in the snippet. It would be great if the same snippet could be used in both modes.

gonuke · 2019-11-27T03:27:44Z

source/cep/cep27.rst

+        var1(0.0),
+        var2(0.0),
+        ...,
+        coordinates(0,0), //coordinates constructor (toolkit feature class)


if we use C++11 can we initialize these in the snippet?

yes that's true, this will be way better !

I'll try this in my Position PR and see how it does work out!

it seems to be working, I updated both the PR and the CEP accordingly

Co-Authored-By: Paul Wilson <[email protected]>

source/cep/cep27.rst

gonuke · 2019-11-27T21:09:39Z

source/cep/cep27.rst

+
+The |Cyclus| toolkit is designed to easily implement specific capabilities in
+newly developed archetypes, such as a trading policy, commodity producers, etc. To
+add characteristics to archetypes such as `Position` or `Metadata`, the actual


This is still a long, awkward sentence.

gonuke · 2019-11-27T21:10:26Z

source/cep/cep27.rst

+--------------------
+``toolkit/my_snippet.cycpp.h``:
+.. highlight:: c
+    cyclus::toolkit::Position coordinates;


I mean the only difference in the snippet. It would be great if the same snippet could be used in both modes.

gonuke

Sorry - just one more suggestion...

And then we need review from others!

source/cep/cep27.rst

…ader, and renameing my_snippet into my_feature_snippet

Co-Authored-By: Paul Wilson <[email protected]>

bam241

I also renamed my_snippet into my_feature_snippet.
I believe it was making more sense.

source/cep/cep27.rst

gonuke · 2019-11-27T23:11:30Z

I still wonder if there is a way for the same snippet to be used for inheritance and membership?

bam241 · 2019-11-27T23:14:15Z

I still wonder if there is a way for the same snippet to be used for inheritance and membership?

that would be nice !

maybe an other way to do this would be to let cycpp do that using #pragmas ?

gonuke · 2019-11-27T23:16:47Z

Maybe we don't include the member variable in the snippet? The user needs to define the name for that member variable? That relaxes one kind of imposed consistency, but maybe that variable name is purely internal and doesn't need to be consistent... just a thought

bam241 · 2019-11-27T23:18:09Z

Maybe we don't include the member variable in the snippet? The user needs to define the name for that member variable? That relaxes one kind of imposed consistency, but maybe that variable name is purely internal and doesn't need to be consistent... just a thought

I liked the snippet idea for the variables exposed in the cyclus input to ensure those one are the same

--- edit ---
I am not sure but I feel like I am missing something about your idea !

gonuke · 2019-11-27T23:25:10Z

source/cep/cep27.rst

+--------------------
+``toolkit/my_feature_snippet.cycpp.h``:
+.. highlight:: c
+    cyclus::toolkit::Position coordinates(0,0);


If you remove only this line (not exposed in input), then the snippet can be used in both modes, and developer chooses name of member variable.

In fact, that might be better, because otherwise developer has to know name of member variable defined in the snippet.

this is correct, (and I like the versatility it provides)
I guess it is a balance between versatility and amount of work on the developer side:
if we only support without-inheritance everything should be includable in the snippet.
if we want to support both, developers have to add:

#include 'toolkit/my_toolkit.h

inheritance or feature element

#include toolkit/snippet.cycpp.h` in the class core.

(this is also why without inheritance has my (slight) preference.)

the good thing with removing the variable it would allow both with and without inheritance

Even without inheritance, I'm not sure we want to assume that the member variable is always defined by the snippet... what if you want two positions?

sure but then what is the use of the snippet ? because some member variable are defined in the snippet (at least the one expose in the input.)

I don't see how to use the snippet with 2 positions.

This might not be the best example of including more than one instance. In addition, there may be a need to initialize each instance which gets complicated again. Nevertheless, I think asking the developer to explicitly declare their member variable is not too much to ask.

We should open this up to additional discussion, e.g. on the mailing list.

I still think there is a benefit to having a single snippet file and then letting user choose the variable name in the non-inheritance case. We can include that in the example in the documentation.

Once we get that resolved, and clean up this CEP, I think I'm ready to approve/merge this and the follow-up PR's in the code repos.

source/cep/cep27.rst

katyhuff · 2020-01-27T20:35:02Z

Just a couple little grammar comments suggested above -- otherwise looks good to me.

Co-Authored-By: Katy Huff <[email protected]>

gonuke

I think this is ready to move forward

bam241 added 4 commits October 28, 2019 11:39

intro

0a96da5

update

9ea0df2

done with first draft

6686d60

some review

1c75d2b

bam241 requested a review from gonuke October 30, 2019 15:45

bam241 assigned bam241 and unassigned bam241 Oct 30, 2019

bam241 requested a review from katyhuff October 30, 2019 15:45

gonuke requested changes Oct 31, 2019

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bam241 and others added 4 commits November 18, 2019 13:59

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Co-Authored-By: Paul Wilson <[email protected]>

some improvement and addition of an implementation example

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removing trailing space

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some text improvement

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bam241 and others added 6 commits November 26, 2019 09:40

upadte tittle

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Merge branch 'cep27' of github.com:bam241/cyclus.github.com into cep27

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add information about where to put the preprocessor additional line

d045749

Add inheritance example

5d09ded

some syntax change

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bam241 and others added 3 commits November 27, 2019 11:23

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calling default construct should be the default when inheriting

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Merge branch 'cep27' of github.com:bam241/cyclus.github.com into cep27

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gonuke reviewed Nov 27, 2019

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simplifying motivation sentences, adding missing include

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adding instruction for toolkit feature header include in arcehtype he…

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…ader, and renameing my_snippet into my_feature_snippet

Update source/cep/cep27.rst

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gonuke merged commit 06bd7ea into cyclus:source Mar 27, 2021

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CEP27: toolkit Snippet #297

CEP27: toolkit Snippet #297

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CEP27: toolkit Snippet #297

CEP27: toolkit Snippet #297

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