[Bug 10122] Adobe Photoshop Album 2 crashes with " MSVCRT___RTDynamicCast Unknown parameter is non-zero: please report"

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=10122


Anastasius Focht <focht at gmx.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |focht at gmx.net




--- Comment #5 from Anastasius Focht <focht at gmx.net>  2007-10-26 18:03:28 ---
Hello,

that dynamic_cast/__RTDynamicCast "unknown" parameter looks like some virtual
function table offset/delta when downcasting virtual base classes.
I wrote some sample, though the downcast itself is not really useful in that
case.

--- snip sample ---
struct vbase
{
    virtual int get_num() const = 0;
};

struct base : virtual vbase
{
    int get_num() const { return 1; }
};

struct derived : virtual base
{
    int get_num() const { return 2; }
};

int main ()
{
   base b;
   derived* d = dynamic_cast<derived*>(&b);
   return 0;
}
--- snip sample ---

__RTDynamicCast "unknown" -> virtual function table offset is 4

object memory layout for "b":

ofs+0: pointer to virtual base class table of "derived"
ofs+4: pointer to virtual function table of "base"

Regards


-- 
Configure bugmail: http://bugs.winehq.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are watching all bug changes.