https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61216
Bug ID: 61216
Summary: wrong name lookup for operator functions with
using-declaration
Product: gcc
Version: 4.8.1
Status: UNCONFIRMED
Severity: trivial
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: palpatin91 at mail dot ru
In GCC 4.8.1 for Windows XP:
---------------------------------------------
gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=f:/dev-cpp/mingw32/bin/../libexec/gcc/mingw32/4.8.1/lto-wrap
per.exe
Target: mingw32
Configured with: ../gcc-4.8.1/configure --prefix=/mingw --host=mingw32
--build=m
ingw32 --without-pic --enable-shared --enable-static --with-gnu-ld --enable-lto
--enable-libssp --disable-multilib
--enable-languages=c,c++,fortran,objc,obj-c++
,ada --disable-sjlj-exceptions --with-dwarf2 --disable-win32-registry
--enable-l
ibstdcxx-debug --enable-version-specific-runtime-libs
--with-gmp=/usr/src/pkg/gm
p-5.1.2-1-mingw32-src/bld --with-mpc=/usr/src/pkg/mpc-1.0.1-1-mingw32-src/bld
--
with-mpfr= --with-system-zlib --with-gnu-as --enable-decimal-float=yes
--enable-
libgomp --enable-threads --with-libiconv-prefix=/mingw32
--with-libintl-prefix=/
mingw --disable-bootstrap LDFLAGS=-s CFLAGS=-D_USE_32BIT_TIME_T
Thread model: win32
gcc version 4.8.1 (GCC)
---------------------------------------------
following code fragment gives compilation error:
---------------------------------------------
class C {
};
namespace N {
C& operator ++(C& obj) { return obj; }
}
C& operator ++(C& obj) { return obj; }
int main()
{
using N::operator ++;
C c;
++c;
}
---------------------------------------------
main.cpp: In function 'int main()':
main.cpp:69:2: error: ambiguous overload for 'operator++' (operand type is 'C')
++c;
^
main.cpp:69:2: note: candidates are:
main.cpp:60:4: note: C& N::operator++(C&)
C& operator ++(C& obj) { return obj; }
^
main.cpp:63:4: note: C& operator++(C&)
C& operator ++(C& obj) { return obj; }
^
---------------------------------------------
But according to 13.3.1.2p3:
"The set of non-member candidates is the result of the unqualified lookup of
operator@ in the context
of the expression according to the usual rules for name lookup in unqualified
function calls (3.4.2)
except that all member functions are ignored."
And the following code compiles just fine:
---------------------------------------------
namespace N {
void f() {}
}
void f() {}
int main()
{
using N::f;
f();
}
---------------------------------------------
So I assume in case of operator functions it should compile also and choose
N::operator ++ version
