include/opencascade/Expr.hxx

0001 // Created on: 1991-01-14
0002 // Created by: Arnaud BOUZY
0003 // Copyright (c) 1991-1999 Matra Datavision
0004 // Copyright (c) 1999-2014 OPEN CASCADE SAS
0005 //
0006 // This file is part of Open CASCADE Technology software library.
0007 //
0008 // This library is free software; you can redistribute it and/or modify it under
0009 // the terms of the GNU Lesser General Public License version 2.1 as published
0010 // by the Free Software Foundation, with special exception defined in the file
0011 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
0012 // distribution for complete text of the license and disclaimer of any warranty.
0013 //
0014 // Alternatively, this file may be used under the terms of Open CASCADE
0015 // commercial license or contractual agreement.
0016
0017 #ifndef _Expr_HeaderFile
0018 #define _Expr_HeaderFile
0019
0020 #include <Standard.hxx>
0021 #include <Standard_DefineAlloc.hxx>
0022 #include <Standard_Handle.hxx>
0023
0024 #include <Standard_Integer.hxx>
0025 #include <Standard_Real.hxx>
0026 class Expr_GeneralExpression;
0027 class Expr_GeneralRelation;
0028
0029 //! This package describes the data structure of any
0030 //! expression, relation or function used in mathematics.
0031 //! It also describes the assignment of variables. Standard
0032 //! mathematical functions are implemented such as
0033 //! trigonometrics, hyperbolics, and log functions.
0034 class Expr
0035 {
0036 public:
0037   DEFINE_STANDARD_ALLOC
0038
0039   Standard_EXPORT static occ::handle<Expr_GeneralExpression> CopyShare(
0040     const occ::handle<Expr_GeneralExpression>& exp);
0041
0042   Standard_EXPORT static int NbOfFreeVariables(const occ::handle<Expr_GeneralExpression>& exp);
0043
0044   Standard_EXPORT static int NbOfFreeVariables(const occ::handle<Expr_GeneralRelation>& exp);
0045
0046   Standard_EXPORT static double Sign(const double val);
0047 };
0048
0049 #endif // _Expr_HeaderFile