errors.hpp

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#ifndef RAD_ERRORS_HPP
#define RAD_ERRORS_HPP

#include <system_error>  // bring in std::error_code et al

namespace rad {

enum class ErrorCodes {
    CANCELLED = 0,  // Operation cancelled
    REPLY_TIMEOUT,
    DESERIALIZATION_ERR,
    UNKNOWN
};

class ErrorCategory : public std::error_category {
   public:
    const char* name() const noexcept override final { return "RAD Error"; }

    std::string message(int err_value) const override final {
        switch (static_cast<rad::ErrorCodes>(err_value)) {
            case rad::ErrorCodes::REPLY_TIMEOUT:
                return "Reply timed out.";
            case rad::ErrorCodes::CANCELLED:
                return "Operation was cancelled.";
            case rad::ErrorCodes::DESERIALIZATION_ERR:
                return "Error parsing message payload.";
            case rad::ErrorCodes::UNKNOWN:
            default:
                return "Unknown error";
        }
    }
};

extern inline const ErrorCategory& GetErrorCategory() {
    static rad::ErrorCategory cat;
    return cat;
}

// NOLINTNEXTLINE
inline std::error_code make_error_code(rad::ErrorCodes e) {
    return {static_cast<int>(e), rad::GetErrorCategory()};
}

}  // namespace rad

namespace std {

// Register rad::ErrorCodes in the standard C++11 error code system
template <>
struct is_error_code_enum<rad::ErrorCodes> : std::true_type {};

}  // namespace std

#endif  // RAD_ERRORS_HPP