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Re: Address of a cast expression in C++
- From: Matt Austern <austern at apple dot com>
- To: Gabriel Dos Reis <gdr at integrable-solutions dot net>
- Cc: gcc at gcc dot gnu dot org
- Date: Tue, 6 Aug 2002 16:28:13 -0700
- Subject: Re: Address of a cast expression in C++
On Thursday, July 25, 2002, at 11:38 AM, Gabriel Dos Reis wrote:
| As I read the C++ Standard, this is incorrect; a diagnostic is
| required. 5.4/1 says that the result of (char)n is an rvalue,
| and 5.3.1/2 says that you can't take the address of an rvalue.
|
| Question: is this violation of the C++ Standard deliberate,
| or is it a bug?
I would say it is a result of a bug -- I suspect another instance of
code duplication where the problem is fixed in C but not in C++ :-(
You're right that code duplication is evil, but the problem here
turns out to be different from what we thought. The logic in
build_unary_op is the same in the C and C++ front ends.
Unfortunately, both front ends call the same function, one in
gcc/tree.c and the other in gcc/cp/tree.c, and the functions have
just slightly different semantics.
I've submitted a patch.
--Matt