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Support merging two util::statistics

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This commit is contained in:
Nikita Lisitsa 2020-12-04 13:09:41 +03:00
parent 7751d6fd36
commit ce4e561cac
1 changed files with 15 additions and 0 deletions
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15
libs/util/include/psemek/util/statistics.hpp
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@ -48,6 +48,9 @@ namespace psemek::util
T min() const { return min_; } T min() const { return min_; }
T max() const { return max_; } T max() const { return max_; }
template <typename H>
friend statistics<H> merge(statistics<H> const & s1, statistics<H> const & s2);
private: private:
std::size_t count_ = 0; std::size_t count_ = 0;
T sum_ = T{0}; T sum_ = T{0};
@ -86,4 +89,16 @@ namespace psemek::util
return os; return os;
} }
template <typename T>
statistics<T> merge(statistics<T> const & s1, statistics<T> const & s2)
{
statistics<T> result;
result.count_ = s1.count_ + s2.count_;
result.sum_ = s1.sum_ + s2.sum_;
result.sum_sqr_ = s1.sum_sqr_ + s2.sum_sqr_;
result.min_ = std::min(s1.min_, s2.min_);
result.max_ = std::max(s1.max_, s2.max_);
return result;
}
} }