StructBuilder.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreTypes.h"
#include "Math/UnrealMathUtility.h"
#include "Templates/AlignmentTemplates.h"
 
class FStructBuilder
{
public:
    constexpr FStructBuilder()
        : EndOfLastMember(0)
        , Alignment      (0)
    {
    }
 
    constexpr int32 AddMember(int32 MemberSize, int32 MemberAlignment)
    {
        int32 Result    = Align(EndOfLastMember, MemberAlignment);
        EndOfLastMember = Result + MemberSize;
        Alignment       = FMath::Max(Alignment, MemberAlignment);
        return Result;
    }
 
    constexpr int32 GetSize() const
    {
        return Align(EndOfLastMember, Alignment);
    }
 
    constexpr int32 GetAlignment() const
    {
        return Alignment;
    }
 
private:
    // The offset from the start of the struct to the end of the last added member
    int32 EndOfLastMember;
 
    // The alignment of the struct
    int32 Alignment;
};