writing json data incremently into a file using jsoncpp

Question

I am using jsoncpp to write the data into json format like following:

Json::Value event;   
Json::Value lep(Json::arrayValue);

event["Lepton"] = lep;
lep.append(Json::Value(1));
lep.append(Json::Value(2));
lep.append(Json::Value(3));
lep.append(Json::Value(4));

event["Lepton"] = lep;
Json::StyledWriter styledWriter;
cout << styledWriter.write(event);

I got the following output:

{
   "Lepton" : [
      1,
      2,
      3,
      4
   ]
}

I want to write multiple such blocks into my data files. What I eventually want is following:

[
    {
       "Lepton" : [
          1,
          2,
          3,
          4
       ]
    },
    {
       "Lepton" : [
          1,
          2,
          3,
          4
       ]
    }
]

Currently, I am writing [ and then the json entries followed by a , and finally at the end ]. Also I have to remove the last , in the final data file.

Is there a way to do all this automatically by jsoncpp or by other means?

Thanks

Answer 1

Using the suggestion from @Some prorammer dude in the comments section, I did the following:

   Json::Value AllEvents(Json::arrayValue);
   for(int entry = 1; entry < 3; ++entry)
   {
      Json::Value event;   
      Json::Value lep(Json::arrayValue); 

      lep.append(Json::Value(1 + entry));
      lep.append(Json::Value(2 + entry));
      lep.append(Json::Value(3 + entry));
      lep.append(Json::Value(4 + entry));

      event["Lepton"] = lep;
      AllEvents.append(event);

      Json::StyledWriter styledWriter;
      cout << styledWriter.write(AllEvents);
   }

I got the desired output as shown below:

    [
        {
           "Lepton" : [
              1,
              2,
              3,
              4
           ]
        },
        {
           "Lepton" : [
              2,
              3,
              4,
              5
           ]
        }
    ]

Basically, I created a Json array and appended the resulting Json objects into it.