| Krzysztof Grobelny | a8182be | 2022-07-04 11:26:20 +0200 | [diff] [blame^] | 1 | #pragma once |
| 2 | |
| 3 | #include <concepts> |
| 4 | #include <variant> |
| 5 | |
| 6 | namespace utils |
| 7 | { |
| 8 | namespace details |
| 9 | { |
| 10 | |
| 11 | template <class T, class... Args> |
| 12 | auto removeMonostate(std::variant<T, Args...>) -> std::variant<T, Args...>; |
| 13 | |
| 14 | template <class... Args> |
| 15 | auto removeMonostate(std::variant<std::monostate, Args...>) |
| 16 | -> std::variant<Args...>; |
| 17 | |
| 18 | template <class Variant> |
| 19 | struct WithoutMonostate |
| 20 | { |
| 21 | private: |
| 22 | public: |
| 23 | using type = decltype(removeMonostate(Variant{})); |
| 24 | }; |
| 25 | |
| 26 | } // namespace details |
| 27 | |
| 28 | template <class Variant> |
| 29 | using WithoutMonostate = typename details::WithoutMonostate<Variant>::type; |
| 30 | |
| 31 | } // namespace utils |