Since I do not get the answer to this question, I have to prototype and test myself, since my dataset headers must be of fixed size, I need fixed-size rows. So, is it possible to specify fixed-size strings or byte arrays in protocol buffers? This is not entirely obvious here, and I kind of feel bad about forcing fixed-size strings in the header message. --ie, std::string('\0', 128);
If not, I would rather use #pragma pack(1) struct header {...};'
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The question is indirectly answered here . Answer and except
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