| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | // SPDX-FileCopyrightText: 2022-2023 Dennis Gläser <dennis.glaeser@iws.uni-stuttgart.de> | ||
| 2 | // SPDX-License-Identifier: MIT | ||
| 3 | /*! | ||
| 4 | * \file | ||
| 5 | * \ingroup Common | ||
| 6 | * \brief Helper functions for variants | ||
| 7 | */ | ||
| 8 | #ifndef GRIDFORMAT_COMMON_VARIANT_HPP_ | ||
| 9 | #define GRIDFORMAT_COMMON_VARIANT_HPP_ | ||
| 10 | |||
| 11 | #include <variant> | ||
| 12 | #include <utility> | ||
| 13 | #include <concepts> | ||
| 14 | #include <type_traits> | ||
| 15 | |||
| 16 | #include <gridformat/common/callable_overload_set.hpp> | ||
| 17 | #include <gridformat/common/exceptions.hpp> | ||
| 18 | #include <gridformat/common/type_traits.hpp> | ||
| 19 | |||
| 20 | namespace GridFormat::Variant { | ||
| 21 | |||
| 22 | #ifndef DOXYGEN | ||
| 23 | namespace Detail { | ||
| 24 | |||
| 25 | template<typename R, typename... Removes, typename... Callables, typename Callback> | ||
| 26 | 172508 | auto append_without_overloads(Overload<Callables...>&& base, Callback cb) { | |
| 27 | 172508 | auto cur_overloads = Overload{std::move(base), [cb=cb] (const R& r) { cb(r); } }; | |
| 28 | if constexpr (sizeof...(Removes) > 0) | ||
| 29 | 2 | return append_without_overloads<Removes...>(std::move(cur_overloads), cb); | |
| 30 | else | ||
| 31 | 172506 | return cur_overloads; | |
| 32 | } | ||
| 33 | |||
| 34 | template<typename... Removes, typename TargetVariant, typename Callback> | ||
| 35 | 172506 | auto without_overload_set(TargetVariant& t, Callback cb) { | |
| 36 | 258759 | auto base_overload = Overload{[&] (const auto& v) { t = v; }}; | |
| 37 | if constexpr (sizeof...(Removes) == 0) | ||
| 38 | return base_overload; | ||
| 39 | else | ||
| 40 | 172506 | return append_without_overloads<Removes...>(std::move(base_overload), cb); | |
| 41 | } | ||
| 42 | |||
| 43 | } // namespace Detail | ||
| 44 | #endif // DOXYGEN | ||
| 45 | |||
| 46 | |||
| 47 | //! \addtogroup Common | ||
| 48 | //! \{ | ||
| 49 | |||
| 50 | template<typename T, typename... Ts> | ||
| 51 | 470240 | constexpr bool is(const std::variant<Ts...>& v) { | |
| 52 |
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940480 | return std::visit(Overload{ |
| 53 | 103595 | [] (const T&) { return true; }, | |
| 54 | 131525 | [] (const auto&) { return false; } | |
| 55 | 940480 | }, v); | |
| 56 | } | ||
| 57 | |||
| 58 | template<typename... Removes, typename... Ts> | ||
| 59 | 172458 | constexpr auto without(const std::variant<Ts...>& v) { | |
| 60 | ✗ | const auto throw_callback = [] (const auto&) { throw ValueError("Cannot remove type currently held by a variant"); }; | |
| 61 | 172458 | ReducedVariant<std::variant<Ts...>, Removes...> result; | |
| 62 |
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172458 | std::visit(Detail::without_overload_set<Removes...>(result, throw_callback), v); |
| 63 | 289661 | return result; | |
| 64 | } | ||
| 65 | |||
| 66 | template<typename Remove, typename... Ts, typename Replacement> | ||
| 67 | requires(!std::same_as<Remove, std::remove_cvref_t<Replacement>> && | ||
| 68 | std::assignable_from<ReducedVariant<std::variant<Ts...>, Remove>&, Replacement>) | ||
| 69 | constexpr auto replace(const std::variant<Ts...>& v, Replacement&& replacement) { | ||
| 70 | ReducedVariant<std::variant<Ts...>, Remove> result; | ||
| 71 | const auto replace_callback = [&] (const Remove&) { result = std::forward<Replacement>(replacement); }; | ||
| 72 | std::visit(Detail::without_overload_set<Remove>(result, replace_callback), v); | ||
| 73 | return result; | ||
| 74 | } | ||
| 75 | |||
| 76 | template<typename T> | ||
| 77 | constexpr T unwrap(const std::variant<T>& v) { | ||
| 78 | return std::visit([] (const T& value) { return value; }, v); | ||
| 79 | } | ||
| 80 | |||
| 81 | template<typename To, typename... Ts> | ||
| 82 | requires(std::conjunction_v<std::is_assignable<To, const Ts&>...>) | ||
| 83 | 28844 | constexpr void unwrap_to(To& to, const std::variant<Ts...>& v) { | |
| 84 |
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43269 | std::visit([&] (const auto& value) { to = value; }, v); |
| 85 | 28844 | } | |
| 86 | |||
| 87 | //! \} group Common | ||
| 88 | |||
| 89 | } // end namespace GridFormat::Variant | ||
| 90 | |||
| 91 | #endif // GRIDFORMAT_COMMON_VARIANT_HPP_ | ||
| 92 |