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CGAL 6.0 - Fast Intersection and Distance Computation (AABB Tree)
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#include <CGAL/AABB_traits_2.h>
Intersection_and_primitive_id<Query>::Type::first_type is found according to the result type of GeomTraits::Intersect_2::operator().
If it is std::optional<T> then it is T, and the result type otherwise.