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//static const char* sccsid = "@(#)Expr_Sign.cxx 3.2 95/01/10"; // Do not delete this line. Used by sccs.
// Copyright: Matra-Datavision 1991
// File: Expr_Sign.cxx
// Created: Tue May 28 12:54:14 1991
// Author: Arnaud BOUZY
// <adn>
#include <Expr_Sign.ixx>
#include <Expr_NumericValue.hxx>
#include <Expr.hxx>
Expr_Sign::Expr_Sign (const Handle(Expr_GeneralExpression)& exp)
{
CreateOperand(exp);
}
Handle(Expr_GeneralExpression) Expr_Sign::ShallowSimplified () const
{
Handle(Expr_GeneralExpression) op = Operand();
if (op->IsKind(STANDARD_TYPE(Expr_NumericValue))) {
Handle(Expr_NumericValue) valop = Handle(Expr_NumericValue)::DownCast(op);
return new Expr_NumericValue(Expr::Sign(valop->GetValue()));
}
Handle(Expr_Sign) me = this;
return me;
}
Handle(Expr_GeneralExpression) Expr_Sign::Copy () const
{
return new Expr_Sign(Expr::CopyShare(Operand()));
}
Standard_Boolean Expr_Sign::IsIdentical (const Handle(Expr_GeneralExpression)& Other) const
{
if (!Other->IsKind(STANDARD_TYPE(Expr_Sign))) {
return Standard_False;
}
Handle(Expr_GeneralExpression) op = Operand();
return op->IsIdentical(Other->SubExpression(1));
}
Standard_Boolean Expr_Sign::IsLinear () const
{
return !ContainsUnknowns();
}
Handle(Expr_GeneralExpression) Expr_Sign::Derivative (const Handle(Expr_NamedUnknown)& ) const
{
return new Expr_NumericValue(0.0);
}
Standard_Real Expr_Sign::Evaluate(const Expr_Array1OfNamedUnknown& vars, const TColStd_Array1OfReal& vals) const
{
Standard_Real res = Operand()->Evaluate(vars,vals);
return Expr::Sign(res);
}
TCollection_AsciiString Expr_Sign::String() const
{
TCollection_AsciiString str("Sign(");
str += Operand()->String();
str += ")";
return str;
}
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