https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111281
--- Comment #4 from Frank Heckenbach <f.heckenb...@fh-soft.de> ---
FWIW, as stated, the lack of context in the message made it hard to find the
actual location of the bug in my code -- in the end even harder than I had
expected since it was well hidden.
Fortunately I was able use concepts to the rescue. Otherwise it would have been
pure guesswork. Here's what I did if anyone cares:
#include <iostream>
template <typename T> concept IsFunction = std::is_function_v <T> ||
(std::is_pointer_v <T> && std::is_function_v <std::remove_pointer_t<T>>);
template <typename T> concept Outputtable = !IsFunction <std::remove_cvref_t
<T>> || std::is_same_v <T, std::ios_base & (std::ios_base &)>; // the latter
part is for std::left etc.
void f (const Outputtable auto &v) { std::cout << v; }
int t ();
int main ()
{
f (t);
}
