Creating A Single Object (of Objects) Within an Array

[najmusi]

I wanted to create a JSON object which has a an array (members) of size 1 containing multiple properties, however what I'm expecting is not what I see being logged. I'm hoping to log the following:

{
  "members": [
    {
      "car": {
        "year": 2018,
        "model": "a7"
      },
      "house": {
        "type": "semi",
        "year": "2011"
      }
    }
  ]
}

I would have believed that this object could have written created using the following script:

    std::ofstream writer("test.json");
    json j, data;

    data[1]["car"]["year"] = 2018;
    data[1]["car"]["model"] = "a7";
    data[1]["house"]["type"] = "semi";
    data[1]["house"]["year"] = 2011;
    j["members"] = data;

    writer << std::setw(2) << j << std::endl;

However, in the logged file I see a null before the first element of members is logged (see below). The properties of members will be collected from a struct, so I would rather not to parse this explicitly. Is there a way to log this JSON object as what I have at the top of this post? Thanks in advance!

{
  "members": [
    null,
    {
      "car": {
        "year": 2018,
        "model": "a7"
      },
      "house": {
        "type": "semi",
        "year": "2011"
      }
    }
  ]
}

[najmusi]

Solved 🎉

It was pointed out that the null is essentially the 0th element of the array. We can log arrays of objects by just ensuring that the array is 0-indexed.