[boost] [variant] unreferenced formal parameter warning from VC9

Subject: [boost] [variant] unreferenced formal parameter warning from VC9
From: Richard Webb (richard.webb_at_[hidden])
Date: 2008-10-05 09:20:25

(i think i might have mentioned this before, but it still happens with the
current code, so...)

Using Variant on VC9 with warning level 4 can result in an unreferenced
parameter warning:

boost/variant/variant.hpp(289) : warning C4100: 'operand' : unreferenced
formal parameter

This can be silenced by extending the existing Borland workaround to apply
to VC as well. For example, change the existing:

#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x0551))
        operand; // suppresses warnings

to

#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x0551)) ||
BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
        operand; // suppresses warnings

Thanks,
Richard Webb
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