Design an Ordered Stream LeetCode solution in C++

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class OrderedStream {
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 public:
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  int pointer = 0;
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  vector<string> stream;
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  OrderedStream(int n) {
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    stream.resize(n);
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  }
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  vector<string> insert(int idKey, string value) {
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    vector<string> ans;
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    stream[idKey - 1] = value;
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    while (pointer < stream.size() and stream[pointer] != "") {
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      ans.push_back(stream[pointer]);
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      pointer++;
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    }
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    return ans;
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  }
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};