about 'optional' field .

[dhb118]

the message like this:
message Role{
optional int32 fieldA = 1;
}

i got message from server, but server didn't packed 'fieldA' everytime .
so how did know if 'fieldA' exist by lua code ?

[cloudwu]

FieldA has a type int32, it must be a value with this type any time.
If the value equal the default value, the implemention would not encode it.

read the document of google protocol buffers for more detail.

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在 2015年1月8日，下午5:19，dhb118 notifications@github.com 写道：

the message like this:
message Role{
optional int32 fieldA = 1;
}

i got message from server, but server didn't packed 'fieldA' everytime .
so how did know if 'fieldA' exist by lua code ?

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[dhb118]

thanks @cloudwu