Hi,
The reason why we generally get this error is basically when we don't implement the overrider. Let me clarify this by giving you an simple example :-
shv:~/quad> cat pure_virtual.cpp
class A
{
public:
typedef unsigned int idtype;
virtual void func(idtype id) = 0; //this is pure virtual function --1
};
class B
{
public:
class C : public A
{
public:
void func(const A::idtype id)
{ }
};
};
int main(const char *pServerName)
{
B::C C1; //this line gives the compilation error.
return 1;
}
Now in the above code, we could see that i have implemented the overrider and hence i wouldn't see any error. Now let's say i will not implement the overrider, then i get the following error :-
shv:~/quad> cat pure_virtual.cpp
class A
{
public:
typedef unsigned int idtype;
virtual void func(idtype id) = 0; //this is pure virtual function --1
};
class B
{
public:
class C : public A
{
public:
//void func(const A::idtype id)
{ }
};
};
int main(const char *pServerName)
{
B::C C1; //this line gives the compilation error.
return 1;
}
Observe the commented "void func(const A::idtype id)", This would produce the following error, which is the same in your case too.
shv:~/quad> icpc pure_virtual.cpp
pure_virtual.cpp(14): error: expected a declaration
{ }
^
pure_virtual.cpp(19): error: object of abstract class type "B::C" is not allowed:
pure virtual function "A::func" has no overrider
B::C C1; //this line gives the compilation error.
^
compilation aborted for pure_virtual.cpp (code 2)
Any class having pure virtual function will make that class "Abstract" meaning any class derived from this class has to implement the pure virtual function (Override).
Hope you understand the consequence of this error. Being said that i would like to check the source code of spider monkey, So please do let me know the source version which you are using and where di you download it from as i am not aware of the specific version that you have downloaded.
Regards,
Sukruth H V
