SerializableAttributeEnum.h

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// Jolt Physics Library (https://github.com/jrouwe/JoltPhysics)
// SPDX-FileCopyrightText: 2021 Jorrit Rouwe
// SPDX-License-Identifier: MIT
 
#pragma once
 
#ifdef JPH_OBJECT_STREAM
 
#include <Jolt/ObjectStream/SerializableAttribute.h>
#include <Jolt/ObjectStream/ObjectStream.h>
 
JPH_NAMESPACE_BEGIN
 
// Macros to add properties to be serialized
 
template <class MemberType>
inline void AddSerializableAttributeEnum(RTTI &inRTTI, uint inOffset, const char *inName)
{
    static_assert(sizeof(MemberType) <= sizeof(uint64));
    using SerializationType = std::conditional_t<sizeof(MemberType) <= sizeof(uint32), uint32, uint64>;
    static constexpr EOSDataType serialization_data_type = sizeof(MemberType) <= sizeof(uint32)? EOSDataType::T_uint32 : EOSDataType::T_uint64;
 
    inRTTI.AddAttribute(SerializableAttribute(inName, inOffset,
        []() -> const RTTI *
        {
            return nullptr;
        },
        [](int inArrayDepth, EOSDataType inDataType, [[maybe_unused]] const char *inClassName)
        {
            return inArrayDepth == 0 && inDataType == serialization_data_type;
        },
        [](IObjectStreamIn &ioStream, void *inObject)
        {
            SerializationType temporary;
            if (OSReadData(ioStream, temporary))
            {
                *reinterpret_cast<MemberType *>(inObject) = static_cast<MemberType>(temporary);
                return true;
            }
            return false;
        },
        [](IObjectStreamOut &ioStream, const void *inObject)
        {
            SerializationType temporary = SerializationType(*reinterpret_cast<const MemberType *>(inObject));
            OSWriteData(ioStream, temporary);
        },
        [](IObjectStreamOut &ioStream)
        {
            ioStream.WriteDataType(serialization_data_type);
        }));
}
 
// JPH_ADD_ENUM_ATTRIBUTE_WITH_ALIAS
#define JPH_ADD_ENUM_ATTRIBUTE_WITH_ALIAS(class_name, member_name, alias_name) \
    JPH::AddSerializableAttributeEnum<decltype(class_name::member_name)>(inRTTI, offsetof(class_name, member_name), alias_name);
 
// JPH_ADD_ENUM_ATTRIBUTE
#define JPH_ADD_ENUM_ATTRIBUTE(class_name, member_name) \
    JPH_ADD_ENUM_ATTRIBUTE_WITH_ALIAS(class_name, member_name, #member_name);
 
JPH_NAMESPACE_END
 
#else
 
#define JPH_ADD_ENUM_ATTRIBUTE_WITH_ALIAS(...)
#define JPH_ADD_ENUM_ATTRIBUTE(...)
 
#endif // JPH_OBJECT_STREAM