DataflowArchive.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
// The following code serializes the size of the PropertyData to serialize so that when loading,
// we can skip over it if the function could not be loaded.
// Serialize a temporary value for the delta in order to end up with an archive of the right size.
// Then serialize the PropertyData in order to get its size.
#define DATAFLOW_OPTIONAL_BLOCK_WRITE_BEGIN(){\
    const int64 NodeDataSizePos = Ar.Tell();\
    int64 NodeDataSize = 0;\
    Ar << NodeDataSize;\
    const int64 NodeBegin = Ar.Tell();
 
 
// Only go back and serialize the number of argument bytes if there is actually an underlying buffer to seek to.
// Come back to the temporary value we wrote and overwrite it with the PropertyData size we just calculated.
// And finally seek back to the end.
#define DATAFLOW_OPTIONAL_BLOCK_WRITE_END()\
    if (NodeDataSizePos != INDEX_NONE)\
    {\
        const int64 NodeEnd = Ar.Tell();\
        NodeDataSize = (NodeEnd - NodeBegin);\
        Ar.Seek(NodeDataSizePos);\
        Ar << NodeDataSize;\
        Ar.Seek(NodeEnd);\
    }\
    }
 
 
#define DATAFLOW_OPTIONAL_BLOCK_READ_BEGIN(COND) \
    {\
    int64 NodeDataSize = 0;\
    Ar << NodeDataSize;\
    if (COND) 
 
#define DATAFLOW_OPTIONAL_BLOCK_READ_ELSE() \
    else{\
    Ar.Seek(Ar.Tell() + NodeDataSize);\
 
#define DATAFLOW_OPTIONAL_BLOCK_READ_END() }}