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* c++/7477: Type information thrown away
@ 2002-08-02 18:56 d.frey
0 siblings, 0 replies; 2+ messages in thread
From: d.frey @ 2002-08-02 18:56 UTC (permalink / raw)
To: gcc-gnats
>Number: 7477
>Category: c++
>Synopsis: Type information thrown away
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Fri Aug 02 18:56:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: d.frey@gmx.de
>Release: unknown-1.0
>Organization:
>Environment:
linux, gcc 3.1
>Description:
Consider the following code:
#include <string>
#include <iostream>
#include <typeinfo>
namespace base
{
struct string : public ::std::string
{
template< typename T >
string( const T& s )
: ::std::string( s, sizeof( s ) / sizeof( *s ) - 1 )
{
std::cout << typeid( T ).name() << std::endl;
}
};
}
void f( const base::string& s )
{
std::cout << s << std::endl;
}
int main()
{
base::string s = "Hello, world!";
std::cout << s << std::endl;
f( "Hello, world!" );
}
The output for the GCC 3.1 is:
A14_c
Hello, world!
PKc
Hel
Which is IMHO not correct. The base::string that is taken by f() should get the same type as the explicitly constructed base::string. For further discussion see the thread in csc++ where James Kanze also provided some references to the standard. I am not sure if it really is a bug, but if it isn't, please show me a reference to the standard which makes it legal to throw away the type information. :)
Regards, Daniel
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: c++/7477: Type information thrown away
@ 2002-09-13 16:29 nathan
0 siblings, 0 replies; 2+ messages in thread
From: nathan @ 2002-09-13 16:29 UTC (permalink / raw)
To: d.frey, gcc-bugs, gcc-prs, nobody
Synopsis: Type information thrown away
State-Changed-From-To: open->analyzed
State-Changed-By: nathan
State-Changed-When: Fri Sep 13 16:29:55 2002
State-Changed-Why:
confirmed. this may be related to 3518
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7477
^ permalink raw reply [flat|nested] 2+ messages in thread
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2002-08-02 18:56 c++/7477: Type information thrown away d.frey
2002-09-13 16:29 nathan
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