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Fix SGN macro
This version behaves the way the documentation states: 0 values will resolve to 0 instead of +1
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@ -92,7 +92,7 @@
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#endif
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#ifndef SGN
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#define SGN(m_v) (((m_v) < 0) ? (-1.0) : (+1.0))
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#define SGN(m_v) (((m_v) == 0) ? (0.0) : (((m_v) < 0) ? (-1.0) : (+1.0)))
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#endif
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#ifndef MIN
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