#pragma once

#include <string>
#include <vector>

namespace cpp11 {

[[nodiscard]] auto double_values(const std::vector<int>& input) -> std::vector<int>;
[[nodiscard]] auto join_with_auto(const std::vector<std::string>& parts) -> std::string;
[[nodiscard]] auto count_if_positive(const std::vector<int>& input) -> int;

}  // namespace cpp11