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The Segment Concept describes the requirements for a segment type. All algorithms in Boost.Geometry will check any geometry arguments against the concept requirements.
traits::tag
              defining segment_tag
              as type
            traits::point_type
              to define the underlying point type (even if it does not consist of
              points, it should define this type, to indicate the points it can work
              with)
            traits::indexed_access,
              per index and per dimension, with two functions:
              get to get a
                    coordinate value
                  set to set a
                    coordinate value (this one is not checked for ConstSegment)
                  | ![[Note]](../../../../../../../doc/src/images/note.png) | Note | 
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            The segment concept is similar to the box concept, defining using another
            tag. However, the box concept assumes the index as  |