I wrote:
class Parent
{
...
private:
virtual Parent& operator=(const Parent& parent);
};
class Child : public Parent
{
...
private:
virtual Child& operator=(const Child& parent);
};
In neither case was the operator=() defined.
With gcc 3.2, this failed to link, with undefined references
for both operator=(), notwithstanding that it was used nowhere
in my code.
The problem was corrected by removing both "virtual".
Is this expected, or is it a problem with the compiler?
Can anyone cite chapter & verse?
Thanks,
Mike. 2 1466
"Mike - EMAIL IGNORED" <m_************ *@yahoo.com> wrote... I wrote:
class Parent { ... private: virtual Parent& operator=(const Parent& parent); };
class Child : public Parent { ... private: virtual Child& operator=(const Child& parent); };
In neither case was the operator=() defined.
With gcc 3.2, this failed to link, with undefined references for both operator=(), notwithstanding that it was used nowhere in my code.
The problem was corrected by removing both "virtual". Is this expected, or is it a problem with the compiler?
Can anyone cite chapter & verse?
10.3/8: A virtual function declared in a class shall be defined,
or declared pure (10.4) in that class, or both; [...]
Victor
"Mike - EMAIL IGNORED" <m_************ *@yahoo.com> wrote in message
news:3F******** *******@yahoo.c om... I wrote:
class Parent { ... private: virtual Parent& operator=(const Parent& parent); };
class Child : public Parent { ... private: virtual Child& operator=(const Child& parent); };
In neither case was the operator=() defined.
With gcc 3.2, this failed to link, with undefined references for both operator=(), notwithstanding that it was used nowhere in my code.
I think that's normal for virtual functions. By definition, the call of a
virtual function is decided at run-time, so I suppose the easiest
implementation is to make sure they are there, just in case.
The problem was corrected by removing both "virtual". Is this expected, or is it a problem with the compiler?
'virtual' is inappropriate anyway because the argument type is different in
each case. Typically, assignment operators are not virtual.
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