Can I memcpy protobuf C++ objects if they only contain fixed length fields?

[Yan Yan]

No strings, no int64, no int32, no repeated fields.

Only sfixed64, sfixed32, nested messages.

Are there any dynamic allocation? Are there any pointers? Is there a subset of protobuf datatypes that I can use to make fixed size objects that works on memcpy? Will the sizeof() operator work? Ideally they should work like C structs of fixed size, and they come with a higher level API. The wire format is good for cross-language compatibility. Thx.

[Feng Xiao]

On Sat, May 14, 2016 at 8:13 AM, Yan Yan <lamh...@gmail.com> wrote:

No strings, no int64, no int32, no repeated fields.

Only sfixed64, sfixed32, nested messages.

Are there any dynamic allocation?

Yes.

 

Are there any pointers?

Yes.

 

Is there a subset of protobuf datatypes that I can use to make fixed size objects that works on memcpy?

No. Even a complete empty protobut message cannot be memcpy.

 

Will the sizeof() operator work? Ideally they should work like C structs of fixed size, and they come with a higher level API. The wire format is good for cross-language compatibility. Thx.

Protobuf C++ objects are not POD and you can't memcpy it.

 

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[Yan Yan]

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