https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121646
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |ppalka at gcc dot gnu.org
--- Comment #1 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Reduced:
template<class T> concept range = requires (T t) { t.begin(); };
struct string_view {
string_view(const char*);
template<range R> string_view(R &&);
const char* begin();
const char* end();
};
struct my_string {
char* ptr;
operator string_view () const;
auto begin() const { return string_view(*this).begin(); }
auto end() const { return string_view(*this).end(); }
};
static_assert(range<my_string>);
This might be an "ill-formed, no diagnostic required" situation. A workaround
is to declare begin()/end() with the concrete return type
std::string_view::iterator.
