[Swig-user] %attribute directive and C++ templates

[Brad H. <fea...@gm...>]

I recently discovered how to use attribute.i and the %attribute
directive to create attributes with customized behavior, as in the
following (superfluous) example:

%attribute(Point, int, x, getX, setX);
%attribute(Point, int, y, getY, setY);
class Point {
public:
    int getX() { return _x };
    void setX(int x) { _x = x };
    int getY() { return _y };
    void setY(int y) { _y = y };
private:
   int _x;
   int _y;
}

It works great for my purposes, except for one thing: I can't figure
out how to make it work with template classes in a generic way. This
is what I've tried:

%attribute(Point<int>, int, x, getX, getY);  // Acheives the desired
effect, but only for Point<int> and not Point<double> etc.

%attribute(Point<T>, int, x, getX, getY); // Compiles, but doesn't
seem to have any useful effect on the generated module.

%attribute(Point<T>, T, x, getX, getY); // Doesn't compile -- says "T"
(in reference to the second T presumably) is not declared.

template<typename T>
%attribute(Point<T>, T, x, getX, getY); // Doesn't compile -- syntax
error for "template<..."

If possible, I would like to be able to create "template attributes,"
ie. attributes that get instantiations for every instantiation of the
owning class template. Otherwise, I will have to write an %attribute
line for every attribute of every instantiation of every class
instantiation that I want to use them.

I know it must show that I'm pretty new to SWIG. If the solution to
this problem seems obvious to anyone, please don't hesitate to point
it out to me anyway; I've been trying to figure out a way to achieve
this effect for a long time and any help would be much appreciated.

Thanks,
- Brad Harms