#pragma once

#include <optional>
#include <string>
#include <vector>

namespace cpp17 {

[[nodiscard]] auto safe_divide(int lhs, int rhs) -> std::optional<double>;
[[nodiscard]] auto find_user(const std::vector<std::string>& users, const std::string& name)
    -> std::optional<std::size_t>;
[[nodiscard]] auto first_positive(const std::vector<int>& data) -> std::optional<int>;

}  // namespace cpp17