Changelog:
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Added
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An AbstractDiscreteInterval class to ease the creation of specialized discrete intervals (experimental).
A create_api function to generate an API similar to the one of portion but configured to use a given subclass of Interval (experimental, see Specialize & customize intervals).
Changed
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Speed up repr and to_string for Interval instances (see #76, adm271828).
Some internal changes to ease subclassing:
from_string and from_data accepts a klass parameter to specify which class should be used to create Interval instances (default is Interval).
Add a klass parameter for open, closed, openclosed, closedopen, singleton and empty (default is Interval).
Add a _klass class attribute in IntervalDict to specify how to create Interval instances (default is Interval).
IntervalDict uses self.__class__ to preserve subclasses when creating new instances.
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
