Segment Concept

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#### Segment Concept

###### Description

The Segment Concept describes the requirements for a segment type. All algorithms in Boost.Geometry will check any geometry arguments against the concept requirements.

###### Concept Definition

- there must be a specialization of `traits::tag` defining `segment_tag` as type
- there must be a specialization of `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)
- there must be a specialization of `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
The segment concept is similar to the box concept, defining using another tag. However, the box concept assumes the index as `min_corner`, `max_corner`, while for the segment concept, there is no assumption.

###### Available Models

- model::segment
- referring segment