[問題] compile error

[uxijgil ()]

在Compile出現下列看不懂的錯誤:

無法解讀.....


我在CirGate這邊這樣寫:

   CirGate() {}
   virtual ~CirGate() {}

在其他的CirXXXGate這樣寫:

   CirXXXGate(const string& s){Name = s;}
   ~CirXXXGate(){}

創造物件的時候寫:
   bool insert(const string& name) {
      ...
      _totalList.insert(new CirInvGate(name));
      ...
   }

不過出現下列錯誤:

> building cirTest...
../../lib/libcir.a(cirCmd.o): In function `CirGate':
/home/B95/b95901017/hw6/src/cir/cirGate.h:13: undefined reference to `vtable
for CirGate'
../../lib/libcir.a(cirCmd.o): In function `~CirGate':
/home/B95/b95901017/hw6/src/cir/cirGate.h:14: undefined reference to `vtable
for CirGate'
../../lib/libcir.a(cirCmd.o):(.rodata._ZTI10CirInvGate[typeinfo for
CirInvGate]+0x8): undefined reference to `typeinfo for CirGate'
../../lib/libcir.a(cirCmd.o):(.rodata._ZTI10CirAndGate[typeinfo for
CirAndGate]+0x8): undefined reference to `typeinfo for CirGate'
../../lib/libcir.a(cirCmd.o):(.rodata._ZTI9CirOrGate[typeinfo for
CirOrGate]+0x8): undefined reference to `typeinfo for CirGate'
../../lib/libcir.a(cirCmd.o):(.rodata._ZTI11CirNandGate[typeinfo for
CirNandGate]+0x8): undefined reference to `typeinfo for CirGate'
../../lib/libcir.a(cirCmd.o):(.rodata._ZTI10CirNorGate[typeinfo for
CirNorGate]+0x8): undefined reference to `typeinfo for CirGate'
../../lib/libcir.a(cirCmd.o):(.rodata._ZTI10CirXorGate[typeinfo for
CirXorGate]+0x8): more undefined references to `typeinfo for CirGate' follow
collect2: ld | ^¶Ç 1

麻煩了 , 謝謝!

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