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According to the design document for params, a 2D array of any type is not supported.

However, if you want to have a 2D array, instead of adding a parser yourself you can use the yaml-cpp library to do a lot of the heavy lifting. You would still pass in a string, but then just call YAML::Node yaml_node = YAML::Load(string) and it will parse it, and you can use its interface to get the values. Here is the yaml-cpp tutorial

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