is_detected_exact semantic edge cases
(too old to reply)
Wee Loong Kuan
2018-11-02 12:12:53 UTC
Hi all,

This is a really contrived example, but I was wondering if the following
case could be considered a (problem/bug/semantic issue) with
is_detected_exact? Given the following alias:

template <typename...>
using meow = std::nonesuch;

The semantics of is_detected_exact<std::nonesuch, meow, void> becomes
unclear. Does it mean that meow<void> does not name a valid type, or does
meow<void> names std::nonesuch?

Would it be better for the standard to specify that is_detected_exact
*must* name true_type if Op<Args...> names a valid type?

Wee Loong
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