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// ======================================================================== //
// Copyright 2009-2019 Intel Corporation //
// //
// 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. //
// ======================================================================== //
#pragma once
#include "platform.h"
namespace oidn {
class RefCount
{
private:
std::atomic<size_t> count;
public:
__forceinline RefCount(int count = 0) noexcept : count(count) {}
__forceinline size_t incRef() noexcept
{
return count.fetch_add(1) + 1;
}
__forceinline size_t decRef()
{
const size_t newCount = decRefKeep();
if (newCount == 0)
destroy();
return newCount;
}
__forceinline size_t decRefKeep() noexcept
{
return count.fetch_add(-1) - 1;
}
__forceinline void destroy()
{
delete this;
}
protected:
// Disable copying
RefCount(const RefCount&) = delete;
RefCount& operator =(const RefCount&) = delete;
virtual ~RefCount() noexcept = default;
};
template<typename T>
class Ref
{
private:
T* ptr;
public:
__forceinline Ref() noexcept : ptr(nullptr) {}
__forceinline Ref(std::nullptr_t) noexcept : ptr(nullptr) {}
__forceinline Ref(const Ref& other) noexcept : ptr(other.ptr) { if (ptr) ptr->incRef(); }
__forceinline Ref(Ref&& other) noexcept : ptr(other.ptr) { other.ptr = nullptr; }
__forceinline Ref(T* ptr) noexcept : ptr(ptr) { if (ptr) ptr->incRef(); }
template<typename Y>
__forceinline Ref(const Ref<Y>& other) noexcept : ptr(other.get()) { if (ptr) ptr->incRef(); }
template<typename Y>
__forceinline explicit Ref(Y* ptr) noexcept : ptr(ptr) { if (ptr) ptr->incRef(); }
__forceinline ~Ref() { if (ptr) ptr->decRef(); }
__forceinline Ref& operator =(const Ref& other)
{
if (other.ptr)
other.ptr->incRef();
if (ptr)
ptr->decRef();
ptr = other.ptr;
return *this;
}
__forceinline Ref& operator =(Ref&& other)
{
if (ptr)
ptr->decRef();
ptr = other.ptr;
other.ptr = nullptr;
return *this;
}
__forceinline Ref& operator =(T* other)
{
if (other)
other->incRef();
if (ptr)
ptr->decRef();
ptr = other;
return *this;
}
__forceinline Ref& operator =(std::nullptr_t)
{
if (ptr)
ptr->decRef();
ptr = nullptr;
return *this;
}
__forceinline operator bool() const noexcept { return ptr != nullptr; }
__forceinline T& operator *() const noexcept { return *ptr; }
__forceinline T* operator ->() const noexcept { return ptr; }
__forceinline T* get() const noexcept { return ptr; }
__forceinline T* detach() noexcept
{
T* res = ptr;
ptr = nullptr;
return res;
}
};
template<typename T> __forceinline bool operator < (const Ref<T>& a, const Ref<T>& b) noexcept { return a.ptr < b.ptr; }
template<typename T> __forceinline bool operator ==(const Ref<T>& a, std::nullptr_t) noexcept { return a.ptr == nullptr; }
template<typename T> __forceinline bool operator ==(std::nullptr_t, const Ref<T>& b) noexcept { return nullptr == b.ptr; }
template<typename T> __forceinline bool operator ==(const Ref<T>& a, const Ref<T>& b) noexcept { return a.ptr == b.ptr; }
template<typename T> __forceinline bool operator !=(const Ref<T>& a, std::nullptr_t) noexcept { return a.ptr != nullptr; }
template<typename T> __forceinline bool operator !=(std::nullptr_t, const Ref<T>& b) noexcept { return nullptr != b.ptr; }
template<typename T> __forceinline bool operator !=(const Ref<T>& a, const Ref<T>& b) noexcept { return a.ptr != b.ptr; }
template<typename T, typename... Args>
__forceinline Ref<T> makeRef(Args&&... args)
{
return Ref<T>(new T(std::forward<Args>(args)...));
}
template<typename T, typename Y>
__forceinline Ref<Y> staticRefCast(const Ref<T>& a)
{
return Ref<Y>(static_cast<Y*>(a.get()));
}
template<typename T, typename Y>
__forceinline Ref<Y> dynamicRefCast(const Ref<T>& a)
{
return Ref<Y>(dynamic_cast<Y*>(a.get()));
}
} // namespace oidn
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