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 errValue) const override final {
        switch (static_cast<rad::ErrorCodes>(errValue)) {
        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;
}

// Overload the global make_error_code() free function with our custom enum.
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 */