resize (mutate) a Vector in a flexbuffer

[Simoncl]

Hi.

Is it possible to resize a Vector  of a flexbuffer?

Can I do something similar to the following but with a flexbuffer?

auto &inventory_field = *fields->LookupByKey("inventory");

auto rinventory = flatbuffers::piv( flatbuffers::GetFieldV<uint8_t>(**rroot, inventory_field),resizingbuf);

 flatbuffers::ResizeVector<uint8_t>(schema, 110, 50, *rinventory, &resizingbuf);  

Cheers

Simon

[Wouter van Oortmerssen]

That is currently not implemented yet, no.

In theory, in-place resizing should be easier in FlexBuffers than FlatBuffers, since it is self-describing, so no need for reflection. There's however one major obstacle: FlexBuffers optimizes offsets to be the smallest possible. This means that if you'd insert in the middle of a buffer, the offsets following it could change size, completely changing the encoding of everything that follows. Implementing that correctly would definitely be complicated.

For now, your best bet are to unpack/insert/repack the whole buffer, or to leave extra space in the vector and use the mutation functions (if dealing with just scalars).

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