Standard_EXPORT static Standard_Real Sign (const Standard_Real val);
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-private:
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-friend class Expr_GeneralExpression;
-friend class Expr_NumericValue;
-friend class Expr_NamedExpression;
-friend class Expr_NamedConstant;
-friend class Expr_NamedUnknown;
-friend class Expr_UnaryExpression;
-friend class Expr_Absolute;
-friend class Expr_ArcCosine;
-friend class Expr_ArcSine;
-friend class Expr_ArcTangent;
-friend class Expr_ArgCosh;
-friend class Expr_ArgSinh;
-friend class Expr_ArgTanh;
-friend class Expr_Cosh;
-friend class Expr_Cosine;
-friend class Expr_Exponential;
-friend class Expr_LogOf10;
-friend class Expr_LogOfe;
-friend class Expr_Sign;
-friend class Expr_Sine;
-friend class Expr_Sinh;
-friend class Expr_Square;
-friend class Expr_SquareRoot;
-friend class Expr_Tangent;
-friend class Expr_Tanh;
-friend class Expr_UnaryFunction;
-friend class Expr_UnaryMinus;
-friend class Expr_BinaryExpression;
-friend class Expr_BinaryFunction;
-friend class Expr_Difference;
-friend class Expr_Division;
-friend class Expr_Exponentiate;
-friend class Expr_PolyExpression;
-friend class Expr_PolyFunction;
-friend class Expr_Product;
-friend class Expr_Sum;
-friend class Expr_UnknownIterator;
-friend class Expr_GeneralRelation;
-friend class Expr_SingleRelation;
-friend class Expr_Different;
-friend class Expr_Equal;
-friend class Expr_GreaterThan;
-friend class Expr_GreaterThanOrEqual;
-friend class Expr_LessThan;
-friend class Expr_LessThanOrEqual;
-friend class Expr_SystemRelation;
-friend class Expr_RelationIterator;
-friend class Expr_RUIterator;
-friend class Expr_GeneralFunction;
-friend class Expr_NamedFunction;
-friend class Expr_FunctionDerivative;
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};
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#endif // _Expr_HeaderFile