can't reference *literal* in an unmanaged function???

can't reference literal in an unmanaged function???

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Ben Voigt - 20 Nov 2006 14:38 GMT

This smells like a bug to me, since literals are substituted at compile
time. I'm using VS2005 SP1 beta.

// literal_unmanaged.cpp : main project file.

ref class TheClass

{

literal int ExitCode = 0;

};

#pragma unmanaged

int main()

{

return TheClass::ExitCode;

}

1>------ Build started: Project: literal_unmanaged, Configuration: Debug
Win32 ------

1>Compiling...

1>literal_unmanaged.cpp

1>.\literal_unmanaged.cpp(12) : error C3821: 'TheClass': managed type or
function cannot be used in an unmanaged function

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Gary Chang[MSFT] - 21 Nov 2006 03:43 GMT

Hi Ben,

>1>.\literal_unmanaged.cpp(12) : error C3821: 'TheClass':
>managed type or function cannot be used in an unmanaged function.

I think the compiler complains about you cannot access a literal which
defines inside a managed type within an unmanaged code block, it breaks the
compiler's rule.

Thanks!

Best regards,

Gary Chang
Microsoft Online Community Support
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Ben Voigt - 21 Nov 2006 15:07 GMT

> Hi Ben,
>
[quoted text clipped - 5 lines]
> the
> compiler's rule.

But why does the rule apply to literals? Using a literal does not require
accessing a managed object, in contrast to static field access which
requires IL (because static field references interact with class
initializers, GC, etc, etc). At least the C# compiler simply substitutes
the literal value at compile time (IL generation, not JIT), why can't the
C++ compiler do likewise? A literal member of integral type should be
considered a constant integral expression and all that implies (use to
declare arrays, as a typedef parameter, etc.)

> Thanks!
>
[quoted text clipped - 21 lines]
> This posting is provided "AS IS" with no warranties, and confers no
> rights.

Reply to this Message

Gary Chang[MSFT] - 22 Nov 2006 03:33 GMT

Hi Ben,

I understand your concern. But your program is not a pure managed one, the
problem is happens inside the native code. That literal is defined within
the managed code, which the unmanage code unable to reference it by the
native code compiler rule. Iam afraid this behavior is by design.

I suggest you can also submit this issue to our product feedback center,
our development team may communicate with you directly on the issue there:

http://connect.microsoft.com/feedback/default.aspx?SiteID=210

Thanks!

Best regards,

Gary Chang
Microsoft Online Community Support
==================================================
Get notification to my posts through email? Please refer to
http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif
ications.
==================================================
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can't reference *literal* in an unmanaged function???

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can't reference literal in an unmanaged function???