This is the mail archive of the
gcc-prs@gcc.gnu.org
mailing list for the GCC project.
Re: c++/5296: Pointers to functions and template functions behave differentl
- From: Noel Yap <nyap at OLF dot COM>
- To: nobody at gcc dot gnu dot org
- Cc: gcc-prs at gcc dot gnu dot org,
- Date: 29 Apr 2002 21:16:02 -0000
- Subject: Re: c++/5296: Pointers to functions and template functions behave differentl
- Reply-to: Noel Yap <nyap at OLF dot COM>
The following reply was made to PR c++/5296; it has been noted by GNATS.
From: Noel Yap <nyap@OLF.COM>
To: "'wolfgang.bangerth@iwr.uni-heidelberg.de'"
<wolfgang.bangerth@iwr.uni-heidelberg.de>,
"'gcc-gnats@gcc.gnu.org'"
<gcc-gnats@gcc.gnu.org>,
"'gcc-prs@gcc.gnu.org'" <gcc-prs@gcc.gnu.org>,
"'gcc-bugs@gcc.gnu.org'" <gcc-bugs@gcc.gnu.org>,
"'nobody@gcc.gnu.org'"
<nobody@gcc.gnu.org>
Cc:
Subject: Re: c++/5296: Pointers to functions and template functions behave
differentl
Date: Mon, 29 Apr 2002 17:14:30 -0400
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML>
<HEAD>
<META HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; =
charset=3Diso-8859-1">
<META NAME=3D"Generator" CONTENT=3D"MS Exchange Server version =
5.5.2653.12">
<TITLE>Re: c++/5296: Pointers to functions and template functions =
behave differentl</TITLE>
</HEAD>
<BODY>
<P><FONT SIZE=3D2 FACE=3D"Arial"><A =
HREF=3D"http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=3Dview%20audit-trail&=
database=3Dgcc&pr=3D5296" =
TARGET=3D"_blank">http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=3Dview%20au=
dit-trail&database=3Dgcc&pr=3D5296</A></FONT>
</P>
<P><FONT SIZE=3D2 FACE=3D"Arial">I've found one or two (depending on if =
you count them to be the same or not) workarounds for this:</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">1. original snippet:</FONT>
<BR><FONT FACE=3D"Courier New">int main () {<BR>
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 print_type (&pp1);<BR>
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 print_type (&pp2<int>);<BR>
=A0 =A0 =A0 =A0 =A0 =A0 =
=A0};</FONT><FONT FACE=3D"Arial"> </FONT>
</P>
<P><FONT SIZE=3D2 FACE=3D"Arial">workaround (note that reinterpret_cast =
will NOT work here):</FONT>
<BR><FONT FACE=3D"Courier New">int main () {<BR>
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 print_type (&pp1);<BR>
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 print_type ((void (*)(int)) &pp2<int>);<BR>
=A0 =A0 =A0 =A0 =A0 =A0 =
=A0};</FONT><FONT FACE=3D"Arial"> </FONT>
</P>
<P><FONT SIZE=3D2 FACE=3D"Arial">2. original snippet:</FONT>
<BR><FONT FACE=3D"Courier New">int main () {<BR>
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 print_type (&pp1);<BR>
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 print_type (&pp2<int>);<BR>
=A0 =A0 =A0 =A0 =A0 =A0 =
=A0};</FONT><FONT FACE=3D"Arial"> </FONT>
</P>
<P><FONT SIZE=3D2 FACE=3D"Arial">workaround:</FONT>
<BR><FONT FACE=3D"Courier New">int main () {</FONT>
<BR> =
=
<FONT FACE=3D"Courier =
New">void (*pp2p)(int) =3D &pp2<int>;</FONT>
<BR>
<BR><FONT FACE=3D"Courier New">=A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 print_type (&pp1);<BR>
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 print_type (pp2p);<BR>
=A0 =A0 =A0 =A0 =A0 =A0 =
=A0};</FONT><FONT FACE=3D"Arial"> </FONT>
</P>
<P><FONT SIZE=3D2 FACE=3D"Arial">I think the fact that reinterpret_cast =
has problems points to the fact that the compiler really doesn't know =
what the type is (and hence, the {unknown_type} in the error =
message).</FONT></P>
<P><FONT SIZE=3D2 FACE=3D"Arial">Noel Yap</FONT>
</P>
<BR>
<P><B><FONT SIZE=3D2 FACE=3D"Arial">=A9 2002 OpenLink Financial =
</FONT></B>
</P>
<P><B><FONT SIZE=3D2 FACE=3D"Arial">Copyright in this message and any =
attachments remains with us. It is</FONT></B>
<BR><B><FONT SIZE=3D2 FACE=3D"Arial">confidential and may be legally =
privileged. If this message is not </FONT></B>
<BR><B><FONT SIZE=3D2 FACE=3D"Arial">intended for you it must not be =
read, copied or used by you or </FONT></B>
<BR><B><FONT SIZE=3D2 FACE=3D"Arial">disclosed to anyone =
else. Please advise the sender immediately if </FONT></B>
<BR><B><FONT SIZE=3D2 FACE=3D"Arial">you have received this message in =
error.</FONT></B>
</P>
<P><B><FONT SIZE=3D2 FACE=3D"Arial">Although this message and any =
attachments are believed to be free of </FONT></B>
<BR><B><FONT SIZE=3D2 FACE=3D"Arial">any virus or other defect that =
might affect any computer system into </FONT></B>
<BR><B><FONT SIZE=3D2 FACE=3D"Arial">which it is received and opened, =
it is the responsibility of the </FONT></B>
<BR><B><FONT SIZE=3D2 FACE=3D"Arial">recipient to ensure that it is =
virus free and no responsibility </FONT></B>
<BR><B><FONT SIZE=3D2 FACE=3D"Arial">is accepted by Open Link =
Financial, Inc. for any loss or damage in any </FONT></B>
<BR><B><FONT SIZE=3D2 FACE=3D"Arial">way arising from its =
use.</FONT></B>
</P>
<BR>
</BODY>
</HTML>