how to define enum field?

[ken cao]

The Style Guide(https://developers.google.com/protocol-buffers/docs/style) suggest that "The zero value enum should have the suffix UNSPECIFIED."

I followed this guide, build a proto, generated a client_type.pb.h in c++ language.

like this:

enum ClientType : int {

  CLIENT_TYPE_UNSPECIFIED = 0,

  CLIENT_TYPE_PHONE = 3,

  CLIENT_TYPE_PAD = 6,

  CLIENT_TYPE_PC = 9,

  CLIENT_TYPE_LANDLINE = 12,

  ClientType_INT_MIN_SENTINEL_DO_NOT_USE_ = std::numeric_limits<::PROTOBUF_NAMESPACE_ID::int32>::min(),

  ClientType_INT_MAX_SENTINEL_DO_NOT_USE_ = std::numeric_limits<::PROTOBUF_NAMESPACE_ID::int32>::max()

};

bool ClientType_IsValid(int value);

constexpr ClientType ClientType_MIN = CLIENT_TYPE_UNSPECIFIED;

constexpr ClientType ClientType_MAX = CLIENT_TYPE_LANDLINE;

constexpr int ClientType_ARRAYSIZE = ClientType_MAX + 1;

But I can't use ClientType_IsValid to check this enum is valid I geted or not.

Because CLIENT_TYPE_UNSPECIFIED is not valid.

Thankyou very much!