Customization

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## Customization

### Intervals

The icl provides the possibility of customizing user defined interval class templates and class types with static interval borders to be used with interval containers.

There is a template `interval_traits`, that has to be instatiated for the user defined interval type, in order to provide associated types and basic functions. Bound types of the interval are assigned by specializing the template `interval_bound_type`.

Customize | Name | Description
--- | --- | ---
associated types | `interval_type` | interval type of the partial specialisation for the user defined type
| `domain_type` | the domain or element type of the interval
| `domain_compare` | the ordering on the elements
basic functions | `construct(const domain_type&, const domain_type&)` | construct an interval
| `lower(const interval_type&)` | select the interval's lower bound
| `upper(const interval_type&)` | select the interval's upper bound
interval bounds | `interval_bound_type<interval_type>{...}` | specialize meta function `interval_bound_type` to assign one of the 4 bound types to the user defined interval.

How to do the customization in detail is shown in example custom interval.