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[Bug c++/11940] New: Ambiguous name lookup error regression
- From: "raimond_merkert at raytheon dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 16 Aug 2003 01:45:53 -0000
- Subject: [Bug c++/11940] New: Ambiguous name lookup error regression
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11940
Summary: Ambiguous name lookup error regression
Product: gcc
Version: 3.4
Status: UNCONFIRMED
Severity: critical
Priority: P1
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: raimond_merkert at raytheon dot com
CC: gcc-bugs at gcc dot gnu dot org
The following code no longer compiles with GCC 3.4 (gcc-3.4-20030813):
cat >> test.cpp <<EOF
#include <vector>
namespace n {
template <class T>
inline void swap (T& x, T& y)
{ T t(x);x=y;y=x; }
struct Y {};
void foo()
{
::std::vector<Y> v1;
::std::vector<Y> v2;
v1.swap(v2);
}
}
EOF
g++ test.cpp -c
This is the error message I'm getting:
/local/gcc-3.4-20030813/lib/gcc/i686-pc-linux-gnu/3.4/../../../../include/c++/3.4/bits/stl_vector.h:
In
member function `void std::vector<_Tp, _Alloc>::swap(std::vector<_Tp,
_Alloc>&) [with _Tp = n::Y, _Alloc = std::allocator<n::Y>]':
test.cpp:14: instantiated from here
/local/gcc-3.4-20030813/lib/gcc/i686-pc-linux-gnu/3.4/../../../../include/c++/3.4/bits/stl_vector.h:730:
error: call
of overloaded `swap(n::Y*&, n::Y*&)' is ambiguous
/local/gcc-3.4-20030813/lib/gcc/i686-pc-linux-gnu/3.4/../../../../include/c++/3.4/bits/stl_algobase.h:119:
note: candidates
are: void std::swap(_Tp&, _Tp&) [with _Tp = n::Y*]
test.cpp:6: note: void n::swap(T&, T&) [with T = n::Y*]
/local/gcc-3.4-20030813/lib/gcc/i686-pc-linux-gnu/3.4/../../../../include/c++/3.4/bits/stl_vector.h:731:
error: call
of overloaded `swap(n::Y*&, n::Y*&)' is ambiguous
/local/gcc-3.4-20030813/lib/gcc/i686-pc-linux-gnu/3.4/../../../../include/c++/3.4/bits/stl_algobase.h:119:
note: candidates
are: void std::swap(_Tp&, _Tp&) [with _Tp = n::Y*]
test.cpp:6: note: void n::swap(T&, T&) [with T = n::Y*]
/local/gcc-3.4-20030813/lib/gcc/i686-pc-linux-gnu/3.4/../../../../include/c++/3.4/bits/stl_vector.h:732:
error: call
of overloaded `swap(n::Y*&, n::Y*&)' is ambiguous
/local/gcc-3.4-20030813/lib/gcc/i686-pc-linux-gnu/3.4/../../../../include/c++/3.4/bits/stl_algobase.h:119:
note: candidates
are: void std::swap(_Tp&, _Tp&) [with _Tp = n::Y*]
test.cpp:6: note: void n::swap(T&, T&) [with T = n::Y*]
I'm fairly sure that the code is correct, because the offending line in
stl_vector actually calls std::swap() and not just swap.
Is this an incorrect application of Koenig lookup?
Code compiles fine with 3.3.1