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            Query the current value of the context property.
          
io_context & query(
    execution::context_t ) const;
            Do not call this function directly. It is intended for use with the
            query
            customisation point.
          
For example:
auto ex = my_io_context.get_executor();
boost::asio::io_context& ctx = boost::asio::query(
    ex, boost::asio::execution::context);