| advanced |

## YMonotonePartitionIsValidTraits_2

### Definition

Requirements of a traits class that is used by y_monotone_partition_is_valid_2 for testing the validity of a y-monotone partition of a polygon.

### Types

All types required by the concept PartitionIsValidTraits_2 are required except the function object type Is_valid. The following type is required instead:

YMonotonePartitionIsValidTraits_2::Is_y_monotone_2
| Model of the concept PolygonIsValid that tests if a sequence of points is y-monotone or not.

### Creation

Only a copy constructor is required.

YMonotonePartitionIsValidTraits_2 traits ( & tr);

### Operations

The following function that creates an instance of the above predicate object type must exist instead of the function is_valid_object required by PartitionIsValidTraits_2.

Is_y_monotone_2 | traits.is_y_monotone_2_object ( t)

### Has Models

CGAL::Partition_traits_2<R>

### See Also

CGAL::partition_is_valid_2
CGAL::y_monotone_partition_2

| advanced |