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c++/10754: cast-as-lvalue extension breaks valid programs
- From: jbuck at synopsys dot com
- To: gcc-gnats at gcc dot gnu dot org
- Date: 12 May 2003 16:56:07 -0000
- Subject: c++/10754: cast-as-lvalue extension breaks valid programs
- Reply-to: jbuck at synopsys dot com
>Number: 10754
>Category: c++
>Synopsis: cast-as-lvalue extension breaks valid programs
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Mon May 12 17:06:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: Joe Buck
>Release: 3.2.3, 3.3-pre, 3.4-pre
>Organization:
>Environment:
>Description:
The cast-as-lvalue extension causes g++ to incorrectly resolve
overloaded functions when the argument is a cast. For example, compile and run the following program:
----------------
#include <iostream>
void foo(int&) {
std::cout << "foo(int&) called\n";
}
void foo(const int&) {
std::cout << "foo(const int&) called\n";
}
int main(int, char**) {
unsigned u = 0;
foo((int)u);
}
>How-To-Repeat:
Compile the above program, run it, and you'll get the message
foo(int&) called
instead of the correct answer,
foo(const int&) called.
This is broken at least as far back as 2.95.2, however,
2.7.2.1 handles it correctly (if iostream.h is used and
the std:: references are dropped).
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: