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How to get base class
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#include <iostream> #include <type_traits> template<typename T> T& getParentObject( int (T::*)() const ); struct BaseC { //If I uncomment the line below, I get a compilation error ~~~~~~~~~~~~~~~~~~~~~~ //using Base = std::remove_reference<decltype(getParentObject(&BaseC::type))>::type; virtual int type() const { return 0; } }; struct Derived : BaseC { using Base = std::remove_reference<decltype(getParentObject(&Derived::type))>::type; int type() const { return 1; } }; struct DDerived : Derived { using Base = std::remove_reference<decltype(getParentObject(&DDerived::type))>::type; int type() const { return 2; } }; template<typename T> struct Logger { static void Print() { std::cout << "Base Logger" << std::endl; } }; template<> struct Logger<Derived> { static void Print() { std::cout << "Derived Logger" << std::endl; } }; template<> struct Logger<DDerived> { static void Print() { std::cout << "DDerived Logger" << std::endl; } }; int main() { Logger<Derived::Base>::Print(); Logger<DDerived::Base>::Print(); }
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Compilation time: 0.32 sec, absolute running time: 0.02 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 0,35 sec
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Base Logger Derived Logger