[Dune] [#951] Fix warning: unused parameter

[Dune]

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FS#951 - Fix warning: unused parameter
User who did this - Elias Pipping (pipping)

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Then a function like the following

virtual void foo(int i, double x, double y, Interval<double>& d, int j) const
{
    bar(i, d, j);
    return;
}

would turn into...

With (1):

virtual void foo(int i, double x, double y, Interval<double>& d, int j) const
{
    (void)x;
    (void)y;
    bar(i, d, j);
    return;
}

or with a #define:

virtual void foo(int i, double x, double y, Interval<double>& d, int j) const
{
    UNUSED_ARGUMENT(x);
    UNUSED_ARGUMENT(y);
    bar(i, d, j);
    return;
}

And with (2):

virtual void foo(int i, double UNUSED_ARG(x), double UNUSED_ARG(y), Interval<double>& d, int j) const
{
    bar(i, d, j);
    return;
}

Is that really desirable?

The last version adds the least amount of noise imho.
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More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=951#comment2688

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