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0031697: Foundation Classes - Expr_GeneralExpression::Derivative does not seem to work (691 & 720)

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This commit is contained in:
ifv 2020-08-07 15:33:12 +03:00 committed by kgv
parent 68556f75f9
commit abca9f3eb8
2 changed files with 51 additions and 1 deletions
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2
src/Expr/Expr_NamedUnknown.cxx
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@ -130,7 +130,7 @@ Standard_Boolean Expr_NamedUnknown::IsLinear () const
Handle(Expr_GeneralExpression) Expr_NamedUnknown::Derivative (const Handle(Expr_NamedUnknown)& X) const
{
Handle(Expr_NamedUnknown) me = this;
if (me != X) {
if (!me->IsIdentical(X)) {
if (IsAssigned()) {
return myExpression->Derivative(X);
}

50
src/QABugs/QABugs_20.cxx
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@ -2664,6 +2664,54 @@ static Standard_Integer OCC30869 (Draw_Interpretor& theDI, Standard_Integer theA
return 0;
}
#include <ExprIntrp_GenExp.hxx>
#include <Expr_GeneralExpression.hxx>
#include <Expr_NamedUnknown.hxx>
//=======================================================================
//function : OCC31697
//purpose :
//=======================================================================
static Standard_Integer OCC31697(Draw_Interpretor& di, Standard_Integer argc, const char ** argv)
{
if (argc < 3)
{
di << "Usage : " << argv[0] << " expression variable\n";
return 1;
}
TCollection_AsciiString anExpStr(argv[1]);
TCollection_AsciiString aVarStr(argv[2]);
Handle(ExprIntrp_GenExp) exprIntrp = ExprIntrp_GenExp::Create();
//
// Create the expression
exprIntrp->Process(anExpStr);
if (!exprIntrp->IsDone())
{
di << "Interpretation of expression " << argv[1] << " failed\n";
return 1;
}
Handle(Expr_GeneralExpression) anExpr = exprIntrp->Expression();
Handle(Expr_NamedUnknown) aVar = new Expr_NamedUnknown(aVarStr);
if (!anExpr->Contains(aVar))
{
di << "Expression " << argv[1] << " does not contain variable " << argv[2] << "\n";
return 1;
}
Handle(Expr_GeneralExpression) aDer = anExpr->Derivative(aVar);
TCollection_AsciiString aDerStr = aDer->String();
di << "The derivative of the " << argv[1] << " by " << argv[2] << " is equal to " << aDerStr << "\n";
return 0;
}
void QABugs::Commands_20(Draw_Interpretor& theCommands) {
const char *group = "QABugs";
@ -2707,5 +2755,7 @@ void QABugs::Commands_20(Draw_Interpretor& theCommands) {
"Usage: OCC30869 wire",
__FILE__, OCC30869, group);
theCommands.Add("OCC31697", "OCC31697 expression variable", __FILE__, OCC31697, group);
return;
}