This little code snippet compiles fine on gcc-3.x and 2.95. On 4.0 it produces
an error of conflicting
declarations of operator int to operator Foo<U>, whereas Foo<U> obviously is
not an int. If you
replace operator Foo<U> with operator Bar (not being templated) it works fine
with gcc-4.0.
template <class T>
class Foo
{
public:
template <class U>
operator Foo<U> () const
{ return Foo<U>(); }
operator int () const
{ return 1; }
};
===============================================================
The compiler output:
g++ -v -save-temps -Wall -c tmpl_op.cc
Reading specs from /usr/lib/gcc/powerpc-apple-darwin8/4.0.0/specs
Configured with: /private/var/tmp/gcc/gcc-4061.obj~8/src/configure
--disable-checking --prefix=/
usr --mandir=/share/man --enable-languages=c,objc,c++,obj-c++
--program-transform-name=/^
[cg][^+.-]*$/s/$/-4.0/ --with-gxx-include-dir=/include/gcc/darwin/4.0/c++
--build=powerpc-
apple-darwin8 --host=powerpc-apple-darwin8 --target=powerpc-apple-darwin8
Thread model: posix
gcc version 4.0.0 20041026 (Apple Computer, Inc. build 4061)
/usr/libexec/gcc/powerpc-apple-darwin8/4.0.0/cc1plus -E -quiet -v
-D__DYNAMIC__ tmpl_op.cc -
fPIC -Wall -fpch-preprocess -D__private_extern__=extern -o tmpl_op.ii
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory
"/usr/lib/gcc/powerpc-apple-darwin8/4.0.0/../../../../powerpc-apple-
darwin8/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/include/gcc/darwin/4.0/c++
/usr/include/gcc/darwin/4.0/c++/powerpc-apple-darwin8
/usr/include/gcc/darwin/4.0/c++/backward
/usr/lib/gcc/powerpc-apple-darwin8/4.0.0/include
/usr/include
/System/Library/Frameworks
/Library/Frameworks
End of search list.
/usr/libexec/gcc/powerpc-apple-darwin8/4.0.0/cc1plus -fpreprocessed tmpl_op.ii
-fPIC -quiet -
dumpbase tmpl_op.cc -auxbase tmpl_op -Wall -version -D__private_extern__=extern
-o tmpl_op.s
GNU C++ version 4.0.0 20041026 (Apple Computer, Inc. build 4061)
(powerpc-apple-darwin8)
compiled by GNU C version 4.0.0 20041026 (Apple Computer, Inc. build
4061).
GGC heuristics: --param ggc-min-expand=56 --param ggc-min-heapsize=49152
tmpl_op.cc:12: error: declaration of 'Foo<T>::operator int() const'
tmpl_op.cc:8: error: conflicts with previous declaration 'Foo<T>::operator
Foo<U>() const'
--
Summary: Conflicting conversion operators ( one being templated
member function )
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: j dot uschok at btinternet dot com
CC: gcc-bugs at gcc dot gnu dot org,j dot uschok at
btinternet dot com
GCC host triplet: Darwin 8.2.0 Darwin Kernel Version 8.2.0: Fri Jun 24
17:46:54 PD
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22510
