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// $Id: NullableInterval.hh 2641 2007-09-02 21:31:02Z flaterco $
// NullableInterval: strict nullable Interval.
/*
Copyright (C) 2004 David Flater.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
// A NullableInterval is not an Interval because the nullability is
// strict (see discussion in Nullable.hh). However, as long as it's
// not null there is an implicit conversion to Interval.
class NullableInterval: public Nullable {
public:
NullableInterval (); // Makes a null Interval.
NullableInterval (const Interval &interval); // Not null.
// Return value in seconds.
// It is an error to call this when null.
const interval_rep_t s () const;
protected:
Interval _interval;
};
// Cleanup2006 Done
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