[jira] [Created] (MESOS-5428) Update the mechanism to define flags in FlagsBase derived clases

["Daniel Pravat (JIRA)" <ji...@apache.org>]

Daniel Pravat created MESOS-5428:
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             Summary: Update the mechanism to define flags in FlagsBase derived clases
                 Key: MESOS-5428
                 URL: https://issues.apache.org/jira/browse/MESOS-5428
             Project: Mesos
          Issue Type: Bug
            Reporter: Daniel Pravat


If a program exeposes flags,  the recommendation from Mesos was to use a derived class from FlagsBase, add the new flags in constructor.
As benefit  the new `Flags` class `inherits` all the flags from the derived classes.
Each derived calss calls the method `add` implemented in `FlagsBase` which uses `dynamic_cast` to set the default value and other things.

Since the constructor is not completed class is not completed (in Visual Studio the vtable is not correct at that time) the code does not work on Windows.
We should have to call a separate method in Windows.



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