[問題] Undefined reference to 'vtable

[mhnp1580 (小路尼)]

[已解決]
不是constructor的問題，
是void printGate() const沒有define
要多加{}
感謝幫我解惑的同學!!!

======================================================================


不好意思想了很久都無解 =____=
我在make的時候出現了以下的error message:
../../lib/libcir.a(cirMgr.o): In function `PI::PI(unsigned int, unsigned
int)':
/home/weining/Documents/hw6/src/cir/cirGate.h:60: undefined reference to
`vtable for PI'
collect2: error: ld returned 1 exit status


以下是程式碼的部分
======================================================================
cirGate.h

class CirGate
{
public:
CirGate(unsigned i = 0, unsigned l = 0, CirGate* fi1 = 0, bool s1 = 0,
CirGate* fi2 = 0, bool s2 = 0) : _id(i), _line(l)
   {
      _fanin[0] = fi1;
      _faninSign[0] = s1;
      _fanin[1] = fi2;
      _fanoutSign[1] = s2;
   }
...
protected:
   unsigned _id;
   unsigned _line;
   CirGate* _fanin[2];
   bool _faninSign[2];
   GateList _fanout;
   vector<bool> _fanoutSign;
}

class PI: public CirGate
{
public:
   PI(unsigned i = 0, unsigned l = 0) : CirGate(i, l) {}
...
};

然後在cirMgr.cpp的readCircuit()裡:

CirGate* gPtr = new PI(id, lineNo);

=================================================================

如果我沒有new PI就不會有以上的error message

但又不能不new PI =____=

拜託大家幫忙了感謝QQ

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◆ From: 140.112.25.106
※ 編輯: mhnp1580        來自: 140.112.25.106       (12/17 23:38)
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