CGAL users discussion list

[Bob Bill <>]

Thanks for your prompt reply, Marc! 

Okay, I got what the problem is. However, I don't see how to dispatch "automatically". I mean, how can I get the actual type of ´first´ in order to pass it as an argument of the proper type to CGAL::intersection() ?

I cannot do something like:

if (const Segment *s = boost::get<Segment>(&first)) {

Segment first_s = *s;

} else if (const Rectangle *p = boost::get<Rectangle>(&first)) {

Rectangle first_r = *p;

} else if (const Triangle *t = boost::get<Triangle>(&first)) {

Triangle first_t = *t;

}

because in this way I will not be able to pass the original `first`. This is the first time I'm using boost libraries, so I'm really sorry if that's a trivial question.

Best,

Bob

Il domenica 20 febbraio 2022, 21:14:43 CET, Marc Glisse <> ha scritto:

On Sun, 20 Feb 2022, Bob Bill  wrote:

> I am facing the following problem: I have two 2D objects. Each one could be a triangle, a rectangle or a segment, and I need to compute their intersection using CGAL::intersection().
> So I created a function `create_suitable_object` that takes the vector with the vertices and create the corresponding CGAL object. As the return type is not unique, I used `boost::variant`.
> Then in my main I created the two objects calling the above mentioned function for each vector of vertices, and then I wanted to pass those objects to CGAL::intersection(). 

Where in the documentation did you see that it was ok to pass a variant to
CGAL::intersection? As far as I can see, it only lists overloads like
intersection(segment, triangle), etc, so you need to handle the
dispatching yourself.

--
Marc Glisse

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