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-- File: TDataStd_Expression.cdl
-- Created: Tue Dec 16 17:32:53 1997
-- Author: Denis PASCAL
-- <dp@dingox.paris1.matra-dtv.fr>
---Copyright: Matra Datavision 1997
class Expression from TDataStd inherits Attribute from TDF
---Purpose: Expression attribute.
-- ====================
--
-- * Data Structure of the Expression is stored in a
-- string and references to variables used by the string
--
-- Warning: To be consistent, each Variable referenced by the
-- expression must have its equivalent in the string
uses Attribute from TDF,
Label from TDF,
GUID from Standard,
Real from Standard,
DataSet from TDF,
RelocationTable from TDF,
ExtendedString from TCollection,
AttributeList from TDF
is
---Purpose: class methods
-- =============
GetID (myclass)
---C++: return const &
returns GUID from Standard;
Set (myclass ; label : Label from TDF)
---Purpose: Find, or create, an Expression attribute.
returns Expression from TDataStd;
---Purpose: Expressionmethods
-- ============
Create
returns mutable Expression from TDataStd;
Name (me)
---Purpose: build and return the expression name
returns ExtendedString from TCollection;
SetExpression (me : mutable; E : ExtendedString from TCollection);
GetExpression (me)
returns ExtendedString from TCollection;
---C++: return const &
GetVariables (me : mutable)
---C++: return &
returns AttributeList from TDF;
---Category: TDF_Attribute methods
-- =====================
ID (me)
---C++: return const &
returns GUID from Standard;
Restore (me: mutable; With : Attribute from TDF);
NewEmpty(me)
returns mutable Attribute from TDF;
Paste (me; Into : mutable Attribute from TDF;
RT : mutable RelocationTable from TDF);
Dump(me; anOS : in out OStream from Standard)
returns OStream from Standard
is redefined;
---C++: return &
fields
myExpression : ExtendedString from TCollection;
myVariables : AttributeList from TDF;
end Expression;
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