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Date: Wed, 27 Feb 2008 20:00:00 -0000
From: Aleksandar Ristovski <aristovski@qnx.com>
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To: Daniel Jacobowitz <drow@false.org>
CC: gdb-patches@sourceware.org
Subject: Re: [patch] fix for c++/2416
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Daniel Jacobowitz wrote:
> On Wed, Feb 27, 2008 at 01:03:26PM -0500, Aleksandar Ristovski wrote:
>> Hello,
>>
>> As described in the bug report 2416, the problem is with casting to a 
>> reference. The attached patch should fix this.
> 
>   /* You can't cast to a reference type.  See value_cast_pointers
>      instead.  */
>   gdb_assert (code1 != TYPE_CODE_REF);
> 
> Is casting to a reference type useful, or should we have issued an
> error instead?  C++ does not permit this.
Not sure what you mean by "C++ does not permit this"...

This is valid:

void testCast1 (IP::base & arg) {
   IP::derived &ader = (IP::derived &)arg;
   cout << "Test the casting\n";
   ader.foo();
}

> 
> The new error is incorrect, which does suggest some missing tests.
> You can cast from a reference type; value_cast follows references,
> so an int is just like an int &.
> 
> Like Michael, I don't understand the value.c changes.  Could you
> explain them?
> 
I replied to that.