| 1 | // Copyright Louis Dionne 2013-2022 |
|---|---|
| 2 | // Distributed under the Boost Software License, Version 1.0. |
| 3 | // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) |
| 4 | |
| 5 | #include <boost/hana/type.hpp> |
| 6 | namespace hana = boost::hana; |
| 7 | |
| 8 | |
| 9 | template <bool b = false> |
| 10 | struct invalid { static_assert(b, "invalid must not be instantiated"); }; |
| 11 | |
| 12 | template <typename T> void adl(T) { } |
| 13 | template <typename T> void adl_pattern(hana::basic_type<T>) { } |
| 14 | |
| 15 | |
| 16 | int main() { |
| 17 | // ADL kicks in but `invalid<>` must not instantiated |
| 18 | adl(hana::type_c<invalid<>>); |
| 19 | adl_pattern(hana::type_c<invalid<>>); |
| 20 | |
| 21 | // ADL instantiates the types recursively, make sure that works too |
| 22 | adl(hana::typeid_(hana::type_c<invalid<>>)); |
| 23 | adl_pattern(hana::typeid_(hana::type_c<invalid<>>)); |
| 24 | } |
| 25 |