//////////////////////////////////////////////////////////////////////////// // // Copyright 2017 Realm Inc. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // //////////////////////////////////////////////////////////////////////////// #ifndef REALM_UTIL_ANY_HPP #define REALM_UTIL_ANY_HPP #include <any> namespace realm::util { using Any = std::any; // We can't use std::any_cast directly because the versions which throw on error // have a deployment target of iOS 11. Once we bump our deployment target to // that we should delete this. template <class T> T any_cast(Any const& v) { using U = std::remove_cv_t<std::remove_reference_t<T>>; static_assert(std::is_constructible_v<T, U const&>, "T must be a const lvalue reference or a CopyConstructible type"); if (auto ptr = std::any_cast<std::add_const_t<U>>(&v)) return static_cast<T>(*ptr); throw std::bad_cast(); } template <class T> T any_cast(Any& v) { using U = std::remove_cv_t<std::remove_reference_t<T>>; static_assert(std::is_constructible_v<T, U&>, "T must be a lvalue reference or a CopyConstructible type"); if (auto ptr = std::any_cast<U>(&v)) return static_cast<T>(*ptr); throw std::bad_cast(); } template <class T> T any_cast(Any&& v) { using U = std::remove_cv_t<std::remove_reference_t<T>>; static_assert(std::is_constructible_v<T, U>, "T must be a rvalue reference or a CopyConstructible type"); if (auto ptr = std::any_cast<U>(&v)) return static_cast<T>(std::move(*ptr)); throw std::bad_cast(); } } // namespace realm::util #endif // REALM_UTIL_ANY_HPP