295    T one(1), minus_one(-1), zero(0);  in test()  local
297    BOOST_CHECK((::boost::math::sign)(minus_one) < 0);  in test()
300    BOOST_CHECK((::boost::math::sign)(minus_one - 30) < 0);  in test()
304    BOOST_CHECK((::boost::math::signbit)(minus_one) > 0);  in test()
307    BOOST_CHECK((::boost::math::signbit)(minus_one - 30) > 0);  in test()
311    BOOST_CHECK_EQUAL(boost::math::changesign(one), minus_one);  in test()
312    BOOST_CHECK((::boost::math::signbit)(boost::math::changesign(minus_one)) == 0);  in test()
313    BOOST_CHECK_EQUAL(boost::math::changesign(minus_one), one);  in test()
317    BOOST_CHECK((::boost::math::signbit)(boost::math::changesign(minus_one - 30)) == 0);  in test()
318    BOOST_CHECK_EQUAL(boost::math::changesign(minus_one - 30), 31);  in test()
323    BOOST_CHECK((::boost::math::signbit)(boost::math::copysign(one, minus_one)) > 0);  in test()
324    BOOST_CHECK_EQUAL(boost::math::copysign(one, minus_one), minus_one);  in test()
325    BOOST_CHECK((::boost::math::signbit)(boost::math::copysign(minus_one, one)) == 0);  in test()
326    BOOST_CHECK_EQUAL(boost::math::copysign(minus_one, one), one);  in test()
327    BOOST_CHECK((::boost::math::signbit)(boost::math::copysign(minus_one, minus_one)) > 0);  in test()
328    BOOST_CHECK_EQUAL(boost::math::copysign(minus_one, minus_one), minus_one);  in test()
331    BOOST_CHECK((::boost::math::signbit)(boost::math::copysign(one + 30, minus_one - 20)) > 0);  in test()
332    BOOST_CHECK_EQUAL(boost::math::copysign(one + 30, minus_one - 20), -31);  in test()
333    BOOST_CHECK((::boost::math::signbit)(boost::math::copysign(minus_one + 2, one + 2)) == 0);  in test()
334    BOOST_CHECK_EQUAL(boost::math::copysign(minus_one - 2, one + 2), 3);  in test()
335    BOOST_CHECK((::boost::math::signbit)(boost::math::copysign(minus_one - 20, minus_one - 30)) > 0);  in test()
336    BOOST_CHECK_EQUAL(boost::math::copysign(minus_one - 20, minus_one - 30), -21);  in test()
356       BOOST_CHECK((::boost::math::signbit)(boost::math::copysign(zero, minus_one)) > 0);  in test()
357       BOOST_CHECK_EQUAL(boost::math::copysign(zero, minus_one), 0);  in test()
360       BOOST_CHECK((::boost::math::signbit)(boost::math::copysign(neg_zero_test, minus_one)) > 0);  in test()
361       BOOST_CHECK_EQUAL(boost::math::copysign(neg_zero_test, minus_one), 0);  in test()