I have a code like:

TestMessage* output;
::google::protobuf::Message* input;
auto reflection = output->GetReflection();

auto extension_field = input->GetDescriptor->extension(i); 

auto output_field = 
reflection->MutableMessage(output, output_field)->CopyFrom(*input);

How can I do a setting of preallocated `input` without copying - in last 

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