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Add NextModN(), PrevModN(), NextIterInCycle(), PrevIterInCycle().

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This commit is contained in:
Yury Melnichek 2011-01-15 23:50:13 +02:00 • committed by Alex Zolotarev
parent 8614cc9087
commit 0980e48d8d
2 changed files with 25 additions and 0 deletions
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10
base/math.hpp
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@ -105,4 +105,14 @@ template <typename T> inline T PowUint(T x, uint64_t n)
return res;
}
template <typename T> inline T NextModN(T x, T n)
{
return x + 1 == n ? 0 : x + 1;
}
template <typename T> inline T PrevModN(T x, T n)
{
return x == 0 ? n - 1 : x - 1;
}
}

15
base/stl_add.hpp
View file

@ -93,3 +93,18 @@ struct NoopFunctor
UNUSED_VALUE(value);
}
};
template <typename IterT> IterT NextIterInCycle(IterT it, IterT beg, IterT end)
{
if (++it == end)
return beg;
return it;
}
template <typename IterT> IterT PrevIterInCycle(IterT it, IterT beg, IterT end)
{
if (it == beg)
it = end;
return --it;
}