How to move STL vector to protobuf RepeatedPtrValue?

Asked May 27 '22 at 01:58

Active May 27 '22 at 02:00

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Is there a way to move STL vector to protobuf repeated? The following code works but I think it is copyng the values, not moving the values.

// foo.proto
message Foo {
  int64 a = 1;
  int64 b = 2;
}
message FooList {
  repeated Foo foos = 1;
}

// main.cc
FooList foo_list;
vector<Foo> v;
v.push_back({1,2});
v.push_back({3,4});
foo_list.mutable_foos() = {v.begin(), v.end()};

edited May 27 '22 at 02:00

asked May 27 '22 at 01:58

Hee Hwang

Use a `std::move_iterator`? – NathanOliver May 27 '22 at 02:00
maybe dupe? https://stackoverflow.com/questions/15004517/moving-elements-from-stdvector-to-another-one – NathanOliver May 27 '22 at 02:01
Thanks for comment. Does this work for the protocol buffer? – Hee Hwang May 27 '22 at 02:03
Not sure. I think it should but you can test by using a class that shows if it is getting moved – NathanOliver May 27 '22 at 02:08
Ah thanks! I will try `foo_list.mutable_foos() = {make_move_iterator(v.begin()), make_move_iterator(v.end()) };` – Hee Hwang May 27 '22 at 02:09

How to move STL vector to protobuf RepeatedPtrValue?

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