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struct VariationCount
boost::optional<double> m_initial;
int m_count;
struct CountVariationBiggerThan
CountVariationBiggerThan(double limit) : m_limit(limit) {}
double m_limit;
VariationCount operator()() const { return VariationCount{}; }
VariationCount operator()(VariationCount gap, double val) const
if (!gap.m_initial)
return VariationCount { val, 0 };
if (abs(val - *gap.m_initial) > m_limit)
return gap;
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