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<stockStaticInfo>::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?

Answer 1

No, you're doing the right thing.

Here's a snippet of my protocol buffer (details omitted for brevity):

message DemandSummary {     required uint32 solutionIndex     = 1;     required uint32 demandID          = 2; } message ComputeResponse {     repeated DemandSummary solutionInfo  = 3; } 

...and the C++ to fill up ComputeResponse::solutionInfo:

ComputeResponse response;  for ( int i = 0; i < demList.size(); ++i ) {      DemandSummary* summary = response.add_solutioninfo();     summary->set_solutionindex(solutionID);     summary->set_demandid(demList[i].toUInt()); } 

response.solutionInfo now contains demList.size() elements.