Conversion from std::vector to repeated field

[Deepak Jain]

Hello guys,

We have a repeated field of GFrameQuery and we have a std::vector.

So, now we need conversion from vector to repeated field.

So we do like

{vec.begin(), vec.end()}

which is a standard thing to do.

But it involved memcy and therefore, it is resulting in performance degradation when lakhs of query come and for each query we have to do such memcy for vector to repeated field and then repeated field to vector conversion.

So, is their any other way to achieve this?

Performance is the key here and that should not be comprised if we compare to other RPC like thrift which works well in above scenario.

Any solution will be appreciated.

Thanks

Deepak Jain

[Brad Town]

If you are doing something like this:

    *foo.mutable_bar() = {strings.begin(), strings.end()};

You would probably see an improvement if you change it to this:

    foo.mutable_bar()->Assign(strings.begin(), strings.end());

Brad

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[Deepak Jain]

Thanks Brad.

I will check this out and get back to you.

Thanks 

[Wei-Jen Lee]

Hi,

I'm facing the same issue and curious about the result? Also, is there any way that we can directly swap the underlying heap/arena allocated container? Thanks in advance!