How do you add a repeated field using Google's Protocol Buffer in C++?

Question

I have the below protocol buffer. Note that StockStatic is a repeated field.

message ServiceResponse
{
    enum Type
    {
        REQUEST_FAILED = 1;
        STOCK_STATIC_SNAPSHOT = 2;
    }

    message StockStaticSnapshot
    {
        repeated StockStatic stock_static = 1;
    }
    required Type type = 1;
    optional StockStaticSnapshot stock_static_snapshot = 2;
}

message StockStatic
{
    optional string sector      = 1;
    optional string subsector   = 2;
}

I am filling out the StockStatic fields while iterating through a vector.

ServiceResponse.set_type(ServiceResponse_Type_STOCK_STATIC_SNAPSHOT);

ServiceResponse_StockStaticSnapshot stockStaticSnapshot;

for (vector::iterator it = m_staticStocks.begin(); it!= m_staticStocks.end(); ++it)
{
    StockStatic* pStockStaticEntity = stockStaticSnapshot.add_stock_static();

    SetStockStaticProtoFields(*it, pStockStaticEntity); // sets sector and subsector field to pStockStaticEntity by reading the fields using (*it)
}

But the above code is right only if StockStatic was an optional field and not a repeated field. My questions is what line of code am i missing to make it a repeated field?

user_12529885 · Answer

Here the c++ sample code but may not efficient:

message MyArray
{
    repeated uint64 my_data = 1;
}

//Copy
std::array test={1,1,2,3,5};
mynamespace::MyArray pbvar;
auto *dst_ptr = keys.my_data();
google::protobuf::RepeatedField field{test.begin(), test.end()};
dst_ptr->CopyFrom(field);

//Output
for (auto it : pbvar.my_data())
    std::cout<

How do you add a repeated field using Google's Protocol Buffer in C++?

3 Answers