Hi,
recently i write a c++ code and have a problem with using virtual function
this is a code,
class Base {
publc :
virtual ~Base() {}
virtual void Set (void) = 0; // pure virutal fuunction
};
class Derived : public Base
{
public:
int m_nTest;
virtual void Set (void) { m_nTest = 10; }
// make global object here !!
Derived gstDerived;
int main (void)
Base * pstBase = &gstDerived;
pstBase->Set(); // -> this is a problem !!!!
}
if i am using normal function override instead virtual method override, perfectly fine,
but when i am using virtual function, looks like linker can not find overried function, (derived Set())
according to assembly code,
1. get gstDerived address
2. get data by reference m_nTest member variable ( it initialized to zero at the begining) as a result get code data from 0x4 address
3. branch with code memory data (i.e., 0xE5000005)
4. prefetch abort
what am i missing to using virtual function. ?
please help me !!!
Does the same code cause the problem without global initialization of Derived gstDerived ?
Sounds your code does not call the C-startup code or the constructor. BTW: It is easier for readers if you post the assembly code instead of giving your interpretation of it.