[vdr] default parameters

["Gerhard Steiner" <steiner@mail.austria.com>]

Hello,
I am trying to implement a patch for sorting.
There is a function called cListBase::Sort(void) which I
what to change to cListBase::Sort(bool asc=true).

Is it possible (allowed, good style) to use default
parameters?
Since cListBase::Sort is called very often, this would be
the better solution, or should I change very call of
cListBase::Sort(void)?

thanks
Gerhard
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