Exception: Add CADKernelError exception for specialized OCC exception…

… propagation to App::DocumentObject

src/Base/Exception.cpp

@@ -545,6 +545,23 @@ UnitsMismatchError::UnitsMismatchError(const UnitsMismatchError &inst)
 {
 }
 
+// ---------------------------------------------------------
+
+CADKernelError::CADKernelError(const char * sMessage)
+: Exception(sMessage)
+{
+}
+
+CADKernelError::CADKernelError(const std::string& sMessage)
+: Exception(sMessage)
+{
+}
+
+CADKernelError::CADKernelError(const CADKernelError &inst)
+: Exception(inst)
+{
+}
+
 // ---------------------------------------------------------
 
 #if defined(__GNUC__) && defined (FC_OS_LINUX)

src/Base/Exception.h

@@ -55,7 +55,7 @@ class BaseExport Exception : public BaseClass
   Exception(const std::string& sMessage);
   Exception(void);
   Exception(const Exception &inst);
-  
+
 protected:
   std::string _sErrMsg;
 };
@@ -488,6 +488,23 @@ class BaseExport UnitsMismatchError : public Exception
   virtual ~UnitsMismatchError() throw() {}
 };
 
+ /* The CADKernelError can be used to indicate an exception originating in the CAD Kernel
+ * allowing to propagate the error messages of, for example, OCC Standard_Failure exception to
+ * the FreeCAD application without making the FreeCAD application depend on OCC.
+ * @author Abdullah Tahiri
+ */
+class BaseExport CADKernelError : public Exception
+{
+public:
+    /// Construction
+    CADKernelError(const char * sMessage);
+    CADKernelError(const std::string& sMessage);
+    /// Construction
+    CADKernelError(const CADKernelError &inst);
+    /// Destruction
+    virtual ~CADKernelError() throw() {}
+};
+
 
 inline void Exception::setMessage(const char * sMessage)
 {