Question #697142 on Yade changed:
https://answers.launchpad.net/yade/+question/697142
Status: Open => Answered
Jan Stránský proposed the following answer:
Hello,
to test the specific instance, you can dynamic_cast the pointer and test
if the cast was successful or not, something like:
/////
Ip2_FrictMat_myMaterial_myPhysics :: go(const shared_ptr<Material>& b1, const
shared_ptr<Material>& b2, const shared_ptr<Interaction>& interaction) {
MyMaterial myMatTest* = dynamic_cast<MyMaterial*>(b2.get());
if (!myMatTest) { // b2 is not MyMaterial instance
std::swap(b1,b2);
}
/// now b1 is FrictMat and b2 is MyMaterial
...
}
/////
A (non-Yade) illustration MWE:
////// g++ test.cpp -o test && ./test
#include<iostream>
#include<memory>
class Base { public: virtual ~Base(){} };
class Derived1 : public Base {};
class Derived2 : public Base {};
int main() {
std::shared_ptr<Base> b1(new Derived1());
std::shared_ptr<Base> b2(new Derived2());
//
Base* base1 = dynamic_cast<Base*>(b1.get());
if (base1) std::cout << "base1 is Base\n";
else std::cout << "base1 is NOT Base\n";
//
Base* base2 = dynamic_cast<Base*>(b2.get());
if (base2) std::cout << "base2 is Base\n";
else std::cout << "base2 is NOT Base\n";
//
Derived1* d11 = dynamic_cast<Derived1*>(b1.get());
if (d11) std::cout << "b1 is Derived1\n";
else std::cout << "b1 is NOT Derived1\n";
//
Derived2* d21 = dynamic_cast<Derived2*>(b1.get());
if (d21) std::cout << "b1 is Derived2\n";
else std::cout << "b1 is NOT Derived2\n";
//
//
Derived1* d12 = dynamic_cast<Derived1*>(b2.get());
if (d12) std::cout << "b1 is Derived1\n";
else std::cout << "b1 is NOT Derived1\n";
//
Derived2* d22 = dynamic_cast<Derived2*>(b2.get());
if (d22) std::cout << "b2 is Derived2\n";
else std::cout << "b2 is NOT Derived2\n";
return 0;
}
//////
Cheers
Jan
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