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Move managed_object_ptr → managed_ptr.h
Summary: These functionality seem generally useful outside of simply interacting with `object.h`. Indeed in future diff, the (arbitrary) restriction that `T` be `whisker::object` or one of its alternatives is relaxed. Change is no-op. Reviewed By: thedavekwon Differential Revision: D68078565 fbshipit-source-id: ac1422ab63f72deb490e397376952388de2887da
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| /* | ||
| * Copyright (c) Meta Platforms, Inc. and affiliates. | ||
| * | ||
| * 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. | ||
| */ | ||
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| #pragma once | ||
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| #include <memory> | ||
| #include <tuple> | ||
| #include <utility> | ||
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| namespace whisker { | ||
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| /** | ||
| * A managed_ptr<T> represents one of: | ||
| * 1. A "static"-ally managed object. See manage_as_static(...). | ||
| * 2. An owned instance of T. See manage_owned(...). | ||
| * 3. A derived instance of T, that is a sub-object of another managed object. | ||
| * See manage_derived(...) and manage_derived_ref(...). | ||
| * | ||
| * All three cases are represented by shared_ptr. See `folly::MaybeManagedPtr`. | ||
| * (1) and (3) use the aliasing constructor of shared_ptr. | ||
| */ | ||
| template <typename T> | ||
| using managed_ptr = std::shared_ptr<const T>; | ||
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| /** | ||
| * Returns a pointer which is an unmanaged reference to the provided | ||
| * object. | ||
| * | ||
| * The caller must guarantee that the provided object is kept alive as long as | ||
| * the returned pointer is used. | ||
| */ | ||
| template <typename T> | ||
| managed_ptr<T> manage_as_static(const T& o) { | ||
| return managed_ptr<T>(managed_ptr<void>(), std::addressof(o)); | ||
| } | ||
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| /** | ||
| * Returns a pointer which directly owns an instance of T. | ||
| */ | ||
| template <typename T, typename... Args> | ||
| managed_ptr<T> manage_owned(Args&&... args) { | ||
| return std::make_shared<const T>(std::forward<Args>(args)...); | ||
| } | ||
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| /** | ||
| * Returns a pointer where the lifetime of `value` depends on one or more other | ||
| * objects. This means that `from` must outlive `value`. | ||
| * | ||
| * The caller must guarantee that the provided object is kept alive as long as | ||
| * the returned pointer is used. | ||
| */ | ||
| template <typename T, typename U> | ||
| managed_ptr<T> manage_derived_ref(const managed_ptr<U>& from, const T& value) { | ||
| return managed_ptr<T>(from, std::addressof(value)); | ||
| } | ||
| // Same as above except derived from multiple objects. | ||
| template <typename T, typename... U> | ||
| managed_ptr<T> manage_derived_ref( | ||
| std::tuple<managed_ptr<U>...> froms, const T& value) { | ||
| return managed_ptr<T>( | ||
| std::make_shared<std::tuple<managed_ptr<U>...>>(std::move(froms)), | ||
| std::addressof(value)); | ||
| } | ||
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| /** | ||
| * Returns a pointer where the lifetime of `value` depends on one or more other | ||
| * objects. This means that `from` must outlive `value`. | ||
| */ | ||
| template <typename T, typename U> | ||
| managed_ptr<T> manage_derived( | ||
| const managed_ptr<U>& from, managed_ptr<T> value_ptr) { | ||
| const T& value = *value_ptr; | ||
| return manage_derived_ref( | ||
| std::tuple<managed_ptr<U>, managed_ptr<T>>(from, std::move(value_ptr)), | ||
| value); | ||
| } | ||
| // Same as above except derived from multiple objects. | ||
| template <typename T, typename... U> | ||
| managed_ptr<T> manage_derived( | ||
| std::tuple<managed_ptr<U>...> froms, managed_ptr<T> value_ptr) { | ||
| const T& value = *value_ptr; | ||
| return manage_derived_ref( | ||
| std::tuple_cat(std::tuple(std::move(value_ptr)), std::move(froms)), | ||
| value); | ||
| } | ||
|
|
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| } // namespace whisker |
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