https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63149
Bug ID: 63149
Summary: can't initialize std::vector<T> from auto-deduced type
'const std::initializer_list<T> &'
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: richard-gccbugzilla at metafoo dot co.uk
Reduced testcase:
namespace std {
template<typename T> struct initializer_list {
const T *p; unsigned long n;
initializer_list(const T *p, unsigned long n);
};
}
struct vector { vector(std::initializer_list<int>); };
void f(vector);
const auto &r = {1, 2, 3};
int main() { f(r); }
GCC rejects-valid here, saying:
<stdin>:10:15: error: could not convert ‘r’ from ‘const
std::initializer_list<const int>’ to ‘vector’
Replacing
const auto &r = {1, 2, 3};
with any of
const std::initializer_list<int> &r = {1, 2, 3};
auto &&r = {1, 2, 3};
auto r = {1, 2, 3};
... makes the problem disappear, so it seems that the 'const' from the
reference is somehow getting muddled into the
