sp1r1t@pandora:~/eafbeadando3$ g++ main.cpp sikidomok.cpp lista.cpp/tmp/ccndtm87.o: In function `SikidomBase::SikidomBase()':sikidomok.cpp:(.text._ZN11SikidomBaseC2Ev[SikidomBase::SikidomBase()]+0x4): undefined reference to `vtable for SikidomBase'/tmp/ccndtm87.o:(.rodata._ZTI7Negyzet[typeinfo for Negyzet]+0x8): undefined reference to `typeinfo for SikidomBase'/tmp/ccndtm87.o:(.rodata._ZTI3Kor[typeinfo for Kor]+0x8): undefined reference to `typeinfo for SikidomBase'collect2: ld returned 1 exit status