How do i include a vector of pointers in my json?

[Leonetienne]

I need a result like this:

{
  "result": "success",
  "num_messages": 45,
  "messages":
  [
    {
      "message": "beep boop",
      "timestamp": 39348
    },
    {
      "message": "blib blub",
      "timestamp": 69420
    },
//...
  ]
}

I have the class LogHistory::LogEntry (class inside of another class) and LogHistory provides a static getter for an std::vector<LogEntry*>*

All fine and good for normal iterating, but how do i put this thing into a json?
I tried the to_json(json& j, LogEntry& le) conversion method, but i just get "no suitable conversion method found"

Both of these two get underlined red with "no suitable conversion method found"

json j = LogHistory::GetLogHistory()->at(3);
json j = *LogHistory::GetLogHistory()->at(3);

I think i may have placed the conversion method in the wrong namespace? Right now it's a static member of LogEntry...

Here is my class structure again for clarity...

class LogHistory
{
   public:
      class LogEntry
      {
         public:
            std::string message;
            int timestamp;

            static void to_json(Json& j, const LogEntry& le)
            {
                j = {{"message", le.message}, {"timestamp", le.timestamp}};
            }
      };

      static std::vector<LogEntry*>* GetLogHistory() { return logHistory; }

      private:
         static std::vector<LogEntry*>* logHistory;
};

Would be very happy if someone could point me in the right direction

[Leonetienne]

It does work when i use a conversion operation, eg

operator json() const
{
   return json{/*...*/};
}

but that obviously does not work with the vector :(

[nlohmann]

You must define the to_json method as a free function (no static function) in the same namespace as LogHistory.