http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59296
Bug ID: 59296
Summary: [c++11] ref-qualified member function is ambiguous
Product: gcc
Version: 4.8.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: eric.niebler at gmail dot com
The following code fails to compile:
struct S
{
constexpr int foo() const & { return 0; }
constexpr int foo() const && { return 42; }
};
int main()
{
constexpr int i = S{}.foo();
}
The error I get is:
$ /usr/local/gcc-4.8.2/bin/g++ -std=gnu++11 -c test.cpp
test.cpp: In function ‘int main()’:
test.cpp:9:31: error: call of overloaded ‘foo()’ is ambiguous
constexpr int i = S{}.foo();
^
test.cpp:9:31: note: candidates are:
test.cpp:3:19: note: constexpr int S::foo() const &
constexpr int foo() const & { return 0; }
^
test.cpp:4:19: note: constexpr int S::foo() const &&
constexpr int foo() const && { return 42; }
^
The code in question is not ambiguous. The object is clearly an rvalue, so the
&&-qualified member should be preferred.
