OptimumSelector.h

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#pragma once
 
#include <algorithm>
#include <numeric>
#include <vector>
 
#include "autopas/options/SelectorStrategyOption.h"
#include "autopas/utils/ExceptionHandler.h"
 
namespace autopas::OptimumSelector {
 
inline long minValue(const std::vector<long> &values) { return *std::min_element(values.cbegin(), values.cend()); }
 
inline long meanValue(const std::vector<long> &values) {
  return std::accumulate(values.cbegin(), values.cend(), 0l) / static_cast<long>(values.size());
}
 
template <class T>
inline T medianValue(std::vector<T> values) {
  if (values.empty()) return 0;
 
  std::sort(values.begin(), values.end());
  return values[(values.size() - 1) / 2];
}
 
inline long optimumValue(const std::vector<long> &values, SelectorStrategyOption strategy) {
  if (values.empty()) {
    return 0l;
  }
 
  switch (strategy) {
    case SelectorStrategyOption::fastestAbs: {
      return minValue(values);
    }
    case SelectorStrategyOption::fastestMean: {
      return meanValue(values);
    }
    case SelectorStrategyOption::fastestMedian: {
      return medianValue(values);
    }
      // no default to get appropriate compiler warnings
  }
 
  autopas::utils::ExceptionHandler::exception("OptionSelector: Unknown selector strategy {}!", strategy);
 
  return 0;
}
 
}  // namespace autopas::OptimumSelector