https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71217
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |10.0
Blocks| |67491
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Seems to be fixed on current trunk:
template<typename T, typename U> struct is_same {
static constexpr bool value = false;
};
template<typename T> struct is_same<T, T> {
static constexpr bool value = true;
};
template <class ... TT> struct Fold;
template <class T>
struct IntFoldCtor
{
enum RetType { Ret = false };
};
template <class T>
concept TestInt = (bool)IntFoldCtor<T>::Ret || is_same<T,int>::value ;
template <TestInt ... TT>
struct IntFoldCtor<Fold<TT...> >
{
enum RetType { Ret = true };
};
static_assert(TestInt<int>);
static_assert(!TestInt<short>); // 0
static_assert(TestInt< Fold<int,int,int> >); // 1
static_assert(!TestInt< Fold<int,int,short> >); // 0
static_assert(TestInt< Fold<int,Fold<int,int>,int> >); // 0
static_assert(!TestInt< Fold<int,Fold<int,short>,int> >); // 0
static_assert(!TestInt< Fold<int,Fold<int,int>,short> >); // 0
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491
[Bug 67491] [meta-bug] concepts issues
