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extend Evoral::Range<T> to offer ::length() and ::squish()

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The latter maps a T into a range, using loop semantics
This commit is contained in:
Paul Davis 2016-09-13 13:54:02 -05:00
parent c578fc724b
commit e05cb11bb0
1 changed files with 12 additions and 0 deletions
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libs/evoral/evoral/Range.hpp
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@ -138,6 +138,18 @@ struct /*LIBEVORAL_API*/ Range {
T from; ///< start of the range
T to; ///< end of the range (inclusive: to lies inside the range)
bool empty() const { return from == to; }
T length() const { return to - from + 1; }
/** for a T, return a mapping of it into the range (used for
* looping). If the argument is earlier than or equal to the end of
* this range, do nothing.
*/
T squish (T t) const {
if (t > to) {
t = (from + ((t - from) % length()));
}
return t;
}
};
template<typename T>