-Wextra with unsigned template parameters

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Hi, I'm using -Wextra (-W) to compile my code, one
feature of which is throwing a warning when an
unsigned type is checked for >= 0 since it's always
true.  In general I find this to be very helpful, but
it throws this error even for templates which may have
instantiations with signed types elsewhere.  A code
example is included below.  Does anyone know how best
to supress this warning without removing the condition
or turning off -Wextra?  Thank you in advance.

template <typename T>
struct foo {    
  foo(T bar) { if (bar >= 0) bar = 1; }
};

foo<unsigned> baz(3);

When this code is compiled by gcc 3.3 with -W -c, it
warns that the comparison of unsigned expression >= 0
is always true.


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