Hi,
After a code review, we decided to change the line ("rootGrammar" is of type
"Grammar*"):
SchemaGrammar* grammar = (SchemaGrammar*)rootGrammar;
to:
SchemaGrammar* grammar = dynamic_cast<SchemaGrammar*>(rootGrammar);
As, we believe that using dynamic_cast (we're developing on the win32 platform, with
vc6), is the most correct way to cast between types in the same inheritance chain (we
use dynamic_cast exclusively in our project).
The only problem is that the latter method fails (whereas the former method never
failed), throwing an exception and returning 0, and yes, the "Grammar" object we're
trying to down-cast is fully initialized. The compiler options are set to support
RTTI, so I'm really failing to see what's wrong here. The stack at the time of failure
looks as follows:
KERNEL32! 77e8f142()
MSVCRTD! _CxxThrowException@8 + 57 bytes
MSVCRTD! __RTDynamicCast + 383 bytes
rfw::XMLPLCBuilder::createDataTypeMapping() line 335 + 23 bytes
It is impossible to trace into the dynamic_cast, so it seems I'm left with very few
options on how to go about to fix this, or at least understand why this fails. Has
anybody else experienced this?
Everything seems ok, the Grammar class is abstract, and seems to be a polymorphic
type, and no warnings or errors occur at compile-time.
Any hints or tips are greatly appreciated
Cheers
Mario
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