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/*
* Copyright 2019-2021 Diligent Graphics LLC
* Copyright 2015-2019 Egor Yusov
*
* 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.
*
* In no event and under no legal theory, whether in tort (including negligence),
* contract, or otherwise, unless required by applicable law (such as deliberate
* and grossly negligent acts) or agreed to in writing, shall any Contributor be
* liable for any damages, including any direct, indirect, special, incidental,
* or consequential damages of any character arising as a result of this License or
* out of the use or inability to use the software (including but not limited to damages
* for loss of goodwill, work stoppage, computer failure or malfunction, or any and
* all other commercial damages or losses), even if such Contributor has been advised
* of the possibility of such damages.
*/
#pragma once
#include "../../Primitives/interface/BasicTypes.h"
#include "../../Platforms/interface/Atomics.hpp"
namespace Diligent
{
using UniqueIdentifier = Int32;
// Template switch is used to have distinct counters
// for unrelated groups of objects
template <typename ObjectsClass>
class UniqueIdHelper
{
public:
UniqueIdHelper() noexcept {}
// clang-format off
UniqueIdHelper (const UniqueIdHelper&) = delete;
UniqueIdHelper& operator = (const UniqueIdHelper&) = delete;
// clang-format on
UniqueIdHelper(UniqueIdHelper&& RHS) noexcept :
m_ID{RHS.m_ID}
{
RHS.m_ID = 0;
}
UniqueIdHelper& operator=(UniqueIdHelper&& RHS) noexcept
{
m_ID = RHS.m_ID;
RHS.m_ID = 0;
return *this;
}
UniqueIdentifier GetID() const noexcept
{
if (m_ID == 0)
{
static Atomics::AtomicLong GlobalCounter; // = 0 causes gcc error
m_ID = static_cast<UniqueIdentifier>(Atomics::AtomicIncrement(GlobalCounter));
}
return m_ID;
}
private:
mutable UniqueIdentifier m_ID = 0;
};
} // namespace Diligent
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