GetField in flatBuffer

[1 gvlab]

Dear all

 I have a noob question , please explain to me

I have read this code . GetField is the member function of flatBuffer .

Please explain to me about these number "6" and "0" . The best way we will choice for that number 

int64_t val() const { return GetField<int64_t>(6, 0); }

and

const flatbuffers::String *id() const { return GetPointer<const flatbuffers::String *>(4); }

Thanks you very much

[Wouter van Oortmerssen]

These are implementation details. A full description is here: http://google.github.io/flatbuffers/md__internals.html

6 (and 4) are vtable offsets where the field offset is stored.

0 is the default value for that field, which is returned if the field is not present. The string doesn't have one since it is always NULL.

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