Re: Providing pure virtual functions with a body
CellDivider wrote:
Hello folks,
as some of you know, it is possible to provide a pure virtual function
with a body, if the body is defined apart from the declaration, for
example
class A {
virtual void f() = 0;
};
A::f() { <.......> }
My question is, where in the standard can you read that this is
possible? The only reference I found is this
10.4 para 2:
.. . . [Note: a function declaration cannot provide both a
pure-specifier and a definition -end note]
Is that all or is it mentioned more explicit anywhere? Because that
would be a little bit reading-between-the-lines I think...
In 12.4 p7, we have
A destructor can be declared virtual (10.3) or pure virtual (10.4);
if any objects of that class or any derived class are created in
the program, the destructor shall be defined.
Since we need the pure virtual destructor definition, therefore
we do not have a good reason to prohibit the other pure function
definitions, providing that they are defined separately from
declarations.
However, even they are called (pure) virtual functions,
we can not call them in a polymorphic manner at all.
--
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