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I would assume something like https://en.cppreference.com/w/cpp/string/basic_string/max_size. For ROS1 internally https://logging.apache.org/log4cxx/latest_stable/apidocs/classlog4cxx_1_1spi_1_1_logging_event.html is used thus I would assume you could use the maximum string size. Yet I would not recommend this.

Do you have a bug where you expect this to be an issue?

What is the use case you have in mind where such a limit could play a role?

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