UE::Geometry::Orient

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namespace UE  
{  
    namespace Geometry  
    {  
        template<typename T>  
        T UE::Geometry::Orient  
        (  
            const UE::Math::TVector2 < T > & A,  
            const UE::Math::TVector2 < T > & B,  
            const UE::Math::TVector2 < T > & C  
        )  
    }  
}  
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> 0 if C is to the left of the line from A to B, < 0 if to the right, 0 if on the line