Overriding a method containing a ref parameter in C++

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Ed Brey - 12 Nov 2004 23:08 GMT

I have a method in a C# assembly like this:

public virtual void RefMeth(ref bool hi) {}

And I want to override it with a VS.Net 2003 Managed C++ method like this:

void RefMeth(bool __gc& hi)

However, when I run, the override never happens. Moreover, if I explicitly
put the virtual keyword on the C++ declaration for RefMeth, and look at the
generated IL, I see that the method has the newslot bit turned on.

I'm guessing that the compiler is getting confused due to the modopt that is
being applied to the C++ method signature.

What do I do to make the override work?

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Tomas Restrepo \(MVP\) - 13 Nov 2004 03:43 GMT

Ed,

> I have a method in a C# assembly like this:
>
[quoted text clipped - 12 lines]
>
> What do I do to make the override work?

Try declaring it in C++ like
void RefMeth(bool __gc* hi);

Signature

Tomas Restrepo
tomasr@mvps.org

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Ed Brey - 15 Nov 2004 14:09 GMT

"Tomas Restrepo (MVP)" wrote:

> Try declaring it in C++ like
> void RefMeth(bool __gc* hi);

Thanks. That dawned on me shortly after I posted (but I couldn't easily
figure out how to get at my posts using MS's web interface to the
newsgroups). I started out trying a pointer, but forgot about the __gc; then
while seeing if references would worked, I rediscovered the __gc qualifier,
but hadn't put it and the pointer together by the time I thought I should
seek out help.

Thanks for the help!
Ed

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Overriding a method containing a ref parameter in C++

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