wehub-resource-sync
165 lines
4.2 KiB
C++
165 lines
4.2 KiB
C++
/* Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License. */
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#pragma once
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#include <utility>
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#include "glog/logging.h"
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#include "paddle/phi/core/enforce.h"
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namespace phi {
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template <typename T>
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class intrusive_ptr {
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public:
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using this_type = intrusive_ptr;
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constexpr intrusive_ptr() noexcept = default;
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~intrusive_ptr() {
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if (px) {
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intrusive_ptr_release(px);
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}
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}
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intrusive_ptr(intrusive_ptr&& rhs) noexcept : px(rhs.px) { rhs.px = nullptr; }
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template <typename U,
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typename = std::enable_if_t<std::is_base_of<T, U>::value>>
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intrusive_ptr(intrusive_ptr<U>&& rhs) noexcept : px(rhs.get()) {
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rhs.reset();
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}
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intrusive_ptr& operator=(intrusive_ptr&& rhs) {
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swap(rhs);
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return *this;
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}
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void reset() { this_type().swap(*this); }
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void reset(T* rhs) { this_type(rhs).swap(*this); }
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void reset(T* rhs, bool add_ref) { this_type(rhs, add_ref).swap(*this); }
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T* get() const noexcept { return px; }
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T* detach() noexcept {
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T* ret = px;
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px = nullptr;
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return ret;
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}
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T& operator*() const {
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PADDLE_ENFORCE_NOT_NULL(
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px,
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common::errors::PreconditionNotMet(
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"The pointer must be non-null before the dereference operation."));
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return *px;
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}
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T* operator->() const {
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PADDLE_ENFORCE_NOT_NULL(
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px,
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common::errors::PreconditionNotMet(
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"The pointer must be non-null before the dereference operation."));
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return px;
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}
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void swap(intrusive_ptr& rhs) noexcept {
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T* tmp = px;
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px = rhs.px;
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rhs.px = tmp;
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}
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private:
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template <typename U,
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typename = std::enable_if_t<std::is_base_of<T, U>::value>>
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explicit intrusive_ptr(U* p, bool add_ref = true) : px(p) {
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if (px && add_ref) {
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intrusive_ptr_add_ref(px);
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}
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}
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template <typename R, typename... Args>
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friend intrusive_ptr<R> make_intrusive(Args&&...);
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template <typename R>
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friend intrusive_ptr<R> copy_intrusive(const intrusive_ptr<R>&);
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T* px{nullptr};
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};
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template <typename T, typename U>
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inline bool operator==(const intrusive_ptr<T>& a,
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const intrusive_ptr<U>& b) noexcept {
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return a.get() == b.get();
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}
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template <typename T, typename U>
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inline bool operator!=(const intrusive_ptr<T>& a,
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const intrusive_ptr<U>& b) noexcept {
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return a.get() != b.get();
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}
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template <typename T, typename U>
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inline bool operator==(const intrusive_ptr<T>& a, U* b) noexcept {
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return a.get() == b;
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}
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template <typename T, typename U>
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inline bool operator!=(const intrusive_ptr<T>& a, U* b) noexcept {
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return a.get() != b;
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}
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template <typename T, typename U>
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inline bool operator==(T* a, const intrusive_ptr<U>& b) noexcept {
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return a == b.get();
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}
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template <typename T, typename U>
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inline bool operator!=(T* a, const intrusive_ptr<U>& b) noexcept {
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return a != b.get();
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}
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template <typename T>
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inline bool operator==(const intrusive_ptr<T>& p, std::nullptr_t) noexcept {
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return p.get() == nullptr;
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}
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template <typename T>
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inline bool operator==(std::nullptr_t, const intrusive_ptr<T>& p) noexcept {
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return p.get() == nullptr;
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}
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template <typename T>
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inline bool operator!=(const intrusive_ptr<T>& p, std::nullptr_t) noexcept {
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return p.get() != nullptr;
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}
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template <typename T>
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inline bool operator!=(std::nullptr_t, const intrusive_ptr<T>& p) noexcept {
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return p.get() != nullptr;
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}
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template <typename T, typename... Args>
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inline intrusive_ptr<T> make_intrusive(Args&&... args) {
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return intrusive_ptr<T>(new T(std::forward<Args>(args)...), false);
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}
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template <typename T>
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inline intrusive_ptr<T> copy_intrusive(const intrusive_ptr<T>& rhs) {
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return intrusive_ptr<T>(rhs.get(), true);
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}
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} // namespace phi
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