New question #684115 on Yade:
https://answers.launchpad.net/yade/+question/684115
Hi. Now i am studying the source code of FrictPhys.cpp. I am confused about
some concepts even after i check the programmer manual. My questions are
mainly about these codes,
1. const shared_ptr<FrictMat>& mat1 = YADE_PTR_CAST<FrictMat>(b1);
1.1 Is the shared_ptr<FrictMat> a template class and will instantiate a
pointer to FricMat? I have checked the definition of shared_ptr but it is too
complicated for a c++ newer to understand.
1.2 The YADE_PTR_CAST will do change the b1 type to FrictMat? But if b1
is not a pointer to FrictMat, like a CohFrictMat, will it cause a material type
mismatch between the particle material and the IPhysFunctor?
2. Ra=sphCont->refR1>0?sphCont->refR1:sphCont->refR2;
Rb=sphCont->refR2>0?sphCont->refR2:sphCont->refR1;
2.1 The Ra, Rb here are the stiffness related particle size? Why these
two values could be negative?
3. interaction->phys = shared_ptr<FrictPhys>(new FrictPhys());
const shared_ptr<FrictPhys>& contactPhysics =
YADE_PTR_CAST<FrictPhys>(interaction->phys);
contactPhysics->kn = Kn; contactPhysics->ks = Ks;
3.1 Also the conversion of interaction->phys to FrictPhy type. Another is
that since the reference contactPhysics has decoration of const, why it is
able to change the value of its pointing memory?
4. Real Kn = (!kn) ? 2*kna*knb/(kna+knb) : (*kn)(mat1->id,mat2->id,kna,knb);
4.1 I understand the true part of this expression. What does the false part
means? (*kn) is a function?
Thanks for your patience to look through all my questions.
Xuesong
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