result.hpp

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#pragma once
 
#include <variant>
 
namespace fur::util {
 
template <typename R, typename E>
class Result {
  std::variant<R, E> _inner;
 
  explicit Result(R&& result);
 
  explicit Result(E&& error);
 
 public:
  Result(const Result&) = delete;
  Result& operator=(const Result&) = delete;
 
  Result(Result&&) noexcept;
  Result& operator=(Result&&) noexcept;
 
  [[nodiscard]] bool valid() const;
  R& operator*();
 
  R* operator->();
  const E& error() const;
 
 public:
  static Result OK(R&& result);
 
  static Result ERROR(E&& error);
};
 
struct Empty {};
 
template <typename E>
using Outcome = Result<Empty, E>;
 
}  // namespace fur::util
 
#include <util/result.inl>