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[Question #690684]: definition of iphys in the .hpp file related to a contact law

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: Rioual <question690684@xxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 13 May 2020 16:11:15 -0000
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New question #690684 on Yade:
https://answers.launchpad.net/yade/+question/690684

Hello,

I try to understand the way we can implement the definition of iPhys of a contact law.
I take example on CpmPhys (https://gitlab.com/yade-dev/trunk/-/blob/master/pkg/dem/ConcretePM.hpp#L138).
The goal is to store in iPhys the relevant parameters of a given interaction.

I don't understand why certain parameters are declared with simple brakets: 
https://gitlab.com/yade-dev/trunk/-/blob/master/pkg/dem/ConcretePM.hpp#L163

why other parameters are declared with  .def prefix as in 
https://gitlab.com/yade-dev/trunk/-/blob/master/pkg/dem/ConcretePM.hpp#L202

and others with .def_readonly


thank you for the explanations,
Best

F.


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