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//static const char* sccsid = "@(#)Expr_UnaryMinus.cxx 3.2 95/01/10"; // Do not delete this line. Used by sccs.
// Copyright: Matra-Datavision 1991
// File: Expr_UnaryMinus.cxx
// Created: Tue Apr 16 17:02:04 1991
// Author: Arnaud BOUZY
// <adn>
#include <Expr_UnaryMinus.ixx>
#include <Expr_NumericValue.hxx>
#include <Expr_Operators.hxx>
#include <Expr.hxx>
#include <Standard_OutOfRange.hxx>
Expr_UnaryMinus::Expr_UnaryMinus(const Handle(Expr_GeneralExpression)& exp)
{
CreateOperand(exp);
}
Handle(Expr_GeneralExpression) Expr_UnaryMinus::ShallowSimplified () const
{
Handle(Expr_GeneralExpression) myexp = Operand();
if (myexp->IsKind(STANDARD_TYPE(Expr_NumericValue))) {
Handle(Expr_NumericValue) myNVexp = Handle(Expr_NumericValue)::DownCast(myexp);
return new Expr_NumericValue(-myNVexp->GetValue());
}
if (myexp->IsKind(STANDARD_TYPE(Expr_UnaryMinus))) {
return myexp->SubExpression(1);
}
Handle(Expr_UnaryMinus) me = this;
return me;
}
Handle(Expr_GeneralExpression) Expr_UnaryMinus::Copy () const
{
return -(Expr::CopyShare(Operand()));
}
Standard_Boolean Expr_UnaryMinus::IsIdentical (const Handle(Expr_GeneralExpression)& Other) const
{
if (Other->IsKind(STANDARD_TYPE(Expr_UnaryMinus))) {
Handle(Expr_GeneralExpression) myexp = Operand();
return myexp->IsIdentical(Other->SubExpression(1));
}
return Standard_False;
}
Standard_Boolean Expr_UnaryMinus::IsLinear () const
{
Handle(Expr_GeneralExpression) myexp = Operand();
return myexp->IsLinear();
}
Handle(Expr_GeneralExpression) Expr_UnaryMinus::Derivative (const Handle(Expr_NamedUnknown)& X) const
{
Handle(Expr_GeneralExpression) myder = Operand();
myder = myder->Derivative(X);
Handle(Expr_UnaryMinus) resu = - myder;
return resu->ShallowSimplified();
}
Handle(Expr_GeneralExpression) Expr_UnaryMinus::NDerivative (const Handle(Expr_NamedUnknown)& X, const Standard_Integer N) const
{
if (N <= 0) {
Standard_OutOfRange::Raise();
}
Handle(Expr_GeneralExpression) myder = Operand();
myder = myder->NDerivative(X,N);
Handle(Expr_UnaryMinus) resu = - myder;
return resu->ShallowSimplified();
}
Standard_Real Expr_UnaryMinus::Evaluate(const Expr_Array1OfNamedUnknown& vars, const TColStd_Array1OfReal& vals) const
{
return - Operand()->Evaluate(vars,vals);
}
TCollection_AsciiString Expr_UnaryMinus::String() const
{
TCollection_AsciiString str;
Handle(Expr_GeneralExpression) op = Operand();
if (op->NbSubExpressions() > 1) {
str = "-(";
str += op->String();
str += ")";
}
else {
str = "-";
str += op->String();
}
return str;
}
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