On 05/17/2010 09:41 AM, Mr Kun Hong wrote:
class A
{
public:
class Position
{
public:
virtual ~Position() {};
virtual bool exists() const = 0;
virtual int getId() const = 0;
};
A::Position is thus an abstract base class.
class PositionWrap : public A::Position, public wrapper<A::Position>
{
public:
virtual int getId() { return this->get_override("getId")(); }
virtual bool exists() { return this->get_override("exists")(); }
};
You derive PositionWrap from the above, but allow for the base class'
"exists()" to be called (if it wasn't provided by a Python derived class).
I think what you may do instead is this:
class PositionWrap : public A::Position, public wrapper<A::Position>
{
public:
bool default_exists();
virtual bool exists()
{
override exists = this->get_override("exists");
if (exists) return exists();
else return default_exists();
}
...
};
This makes sure you have a valid fallback, so the base class'
"exists()" is never called.
Stefan
--
...ich hab' noch einen Koffer in Berlin...
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