From: Jim Blandy <jimb@codesourcery.com>
To: Douglas Evans <dje@google.com>
Cc: Paul Hilfinger <Hilfinger@adacore.com>, gdb@sourceware.org
Subject: Re: print/x on references
Date: Fri, 19 Oct 2007 21:40:00 -0000 [thread overview]
Message-ID: <m3r6jq941b.fsf@codesourcery.com> (raw)
In-Reply-To: <20071018192103.GA31401@caradoc.them.org> (Daniel Jacobowitz's message of "Thu, 18 Oct 2007 15:21:03 -0400")
Daniel Jacobowitz <drow at false.org> writes:
> On Thu, Oct 18, 2007 at 10:45:14AM -0700, Douglas Evans wrote:
>> fwiw,
>> I think the expression evaluator should work as the language does (as
>> much as possible). And once it does that then thought is given to
>> whatever extensions are needed to accomplish things not possible with
>> the language syntax.
>> e.g. "p cut-n-pasted-expression-from-source" should "just work" (to
>> some reasonable extent).
>>
>> Given that, to me "p &cref" -> (c*) and not (c**) follows naturally
>> out of c++ syntax. Whatever goop we want to add to get at the address
>> of the object containing the reference is separate. "p &(&cref)" is
>> the first thing that came to mind and wonderfully it "just worked".
>> One may want a different (or additional) way to achieve this of
>> course, but it should not break "p &cref" -> (c*).
>
> That is an excellent explanation. You've convinced me.
It turns out this is actually documented in the manual:
File: gdb.info, Node: C Operators
...
`&'
Address operator. Defined on variables. Same precedence as `++'.
For debugging C++, GDB implements a use of `&' beyond what is
allowed in the C++ language itself: you can use `&(&REF)' (or, if
you prefer, simply `&&REF') to examine the address where a C++
reference variable (declared with `&REF') is stored.
next prev parent reply other threads:[~2007-10-19 21:40 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-18 9:37 Paul Hilfinger
2007-10-18 11:16 ` Daniel Jacobowitz
2007-10-18 16:05 ` Douglas Evans
2007-10-18 16:30 ` Daniel Jacobowitz
2007-10-18 17:03 ` Douglas Evans
2007-10-18 17:10 ` Douglas Evans
2007-10-18 17:11 ` Daniel Jacobowitz
2007-10-18 17:45 ` Douglas Evans
2007-10-18 19:10 ` Paul Hilfinger
2007-10-18 19:21 ` Daniel Jacobowitz
2007-10-18 19:30 ` Paul Hilfinger
2007-10-18 19:39 ` Daniel Jacobowitz
2007-10-19 21:40 ` Jim Blandy [this message]
2007-10-19 22:00 ` Daniel Jacobowitz
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