## MinCircle2Traits

### Definition

This concept defines the requirements for traits classes of CGAL:: Min_circle_2<Traits>.

### Types

MinCircle2Traits::Point
| The point type must provide default and copy constructor, assignment and equality test.
MinCircle2Traits::Circle
| The circle type must fulfill the requirements listed below in the next section.

### Variables

Circle | circle; | The current circle. This variable is maintained by the algorithm, the user should neither access nor modify it directly.

### Creation

Only default and copy constructor are required.

MinCircle2Traits traits;

MinCircle2Traits traits ( MinCircle2Traits);

### Operations

The following predicate is only needed, if the member function is_valid of Min_circle_2 is used.

CGAL::Orientation | traits.orientation ( Point p, Point q, Point r)
|  | returns constants CGAL:: LEFT_TURN, CGAL:: COLLINEAR, or CGAL:: RIGHT_TURN iff r lies properly to the left of, on, or properly to the right of the oriented line through p and q, resp.

### Has Models

CGAL::Min_circle_2_traits_2<K>

### See Also

CGAL::Min_circle_2<Traits>