https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92687
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Testcase without using library:
namespace std {
template<typename T> struct tuple_size;
template<int, typename> struct tuple_element;
}
struct A {
int i;
template <int I> int& get() { return i; }
};
template<> struct std::tuple_size<A> { static const int value = 2; };
template<int I> struct std::tuple_element<I,A> { using type = int; };
template<typename T>
struct is_reference {
static const bool value = false;
};
template<typename T>
struct is_reference<T&>
{
static const bool value = true;
};
template<typename T>
struct is_reference<T&&>
{
static const bool value = true;
};
template<int N>
void
foo ()
{
auto [x, y] = A {};
static_assert (!is_reference<decltype (x)>::value, "");
}
void
bar ()
{
auto [x, y] = A {};
static_assert (!is_reference<decltype (x)>::value, "");
}
template<typename T>
void
baz ()
{
auto [x, y] = T {};
static_assert (!is_reference<decltype (x)>::value, "");
}
void
qux ()
{
foo<0> ();
baz<A> ();
}
which shows it is only for the non-dependent structured binding in a template
case.
