Kernel::ConstructVector

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Kernel::ConstructVector_2

A model for this must provide:

Kernel::Vector_2	fo.operator() ( Kernel::Point_2 a, Kernel::Point_2 b)
		introduces the vector b-a.

Kernel::Vector_2	fo.operator() ( Origin o, Kernel::Point_2 b)
		introduces the vector b.

Kernel::Vector_2	fo.operator() ( Kernel::Point_2 a, Origin o)
		introduces the vector -a.

Kernel::Vector_2	fo.operator() ( Kernel::Segment_2 s)
		introduces the vector s.target()-s.source().

Kernel::Vector_2	fo.operator() ( Kernel::Ray_2 r)
		introduces a vector having the same direction as r.

Kernel::Vector_2	fo.operator() ( Kernel::Line_2 l)
		introduces a vector having the same direction as l.

Kernel::Vector_2	fo.operator() ( Null_vector NULL_VECTOR)
		introduces a null vector .

AdaptableFunctor (with two arguments)