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78 lines
2.1 KiB
C++
78 lines
2.1 KiB
C++
/*
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* All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
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* its licensors.
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*
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* For complete copyright and license terms please see the LICENSE at the root of this
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* distribution (the "License"). All use of this software is governed by the License,
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* or, if provided, by the license below or the license accompanying this file. Do not
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* remove or modify any license notices. This file 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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*
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*/
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// Original file Copyright Crytek GMBH or its affiliates, used under license.
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// Description : A wrapper that counts the number of times the wrapped object
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// has been set This is useful for netserializing an object
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// that might be given a new value that s the same as the old value
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#ifndef CRYINCLUDE_CRYCOMMON_COUNTEDVALUE_H
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#define CRYINCLUDE_CRYCOMMON_COUNTEDVALUE_H
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#pragma once
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template <typename T>
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struct CountedValue
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{
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public:
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CountedValue()
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: m_lastProducedId(0)
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, m_lastConsumedId(0) {}
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typedef uint32 TCountedID;
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void SetAndDirty(const T& value)
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{
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m_value = value;
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++m_lastProducedId;
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CRY_ASSERT(m_lastProducedId > 0);
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}
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const T* GetLatestValue()
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{
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bool bHasNewValue = IsDirty(); // check for dirtiness before updating ids
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m_lastConsumedId = m_lastProducedId;
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return bHasNewValue ? &m_value : NULL;
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}
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inline bool IsDirty() const
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{
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return m_lastProducedId != m_lastConsumedId;
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}
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const T& Peek() const
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{
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return m_value;
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}
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TCountedID GetLatestID() const
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{
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return m_lastProducedId;
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}
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// This method should only be used to update the object during serialization!
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void UpdateDuringSerializationOnly(const T& value, TCountedID lastProducedId)
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{
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m_value = value;
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m_lastProducedId = lastProducedId;
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}
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private:
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TCountedID m_lastProducedId;
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TCountedID m_lastConsumedId;
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T m_value;
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};
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#endif // CRYINCLUDE_CRYCOMMON_COUNTEDVALUE_H
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