std::views::common metodu

Giriş

std::ranges::range tipinden olan değişkeni, STL Container gibi kullabilmeyi sağlar.

Örnek

Şöyle yaparız

template <std::ranges::range R>
auto to_vector(R&& r) {
    auto r_common = r | std::views::common;
    return std::vector(r_common.begin(), r_common.end());
}

Örnek

Şöyle yaparız

#include <cmath>
#include <numeric>
#include <ranges>
#include <utility>

template<typename Container>
auto mean_and_stddev(const Container& values)
{
  auto len = static_cast<double>(values.size());
  auto mean = std::accumulate(values.begin(), values.end(), 0.0) / len;
  auto sdv =                   // squared differences view
      values
      | std::views::transform([mean](auto d){ auto x = d - mean; return x*x; })
      | std::views::common;
  auto stddev = std::sqrt(std::accumulate(sdv.begin(), sdv.end(), 0.0) / len);
  return std::pair{ mean, stddev };
}