Union.h

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#pragma once
 
#include "Object.h"
 
namespace ConfigDB
{
class Union : public Object
{
public:
    using Tag = uint8_t;
 
    using Object::Object;
 
    Tag getTag() const
    {
        return getPropertyData(0)->uint8;
    }
 
    void setTag(Tag tag)
    {
        assert(tag < typeinfo().objectCount);
        disposeArrays();
        memset(getDataPtr(), 0, typeinfo().structSize);
        getPropertyData(0)->uint8 = tag;
        getObject(0).resetToDefaults();
    }
 
    void clear()
    {
        disposeArrays();
        memset(getDataPtr(), 0, typeinfo().structSize);
        getPropertyData(0)->uint8 = 0;
        getObject(0).clear();
    }
 
    unsigned getObjectCount() const
    {
        return 1;
    }
 
    Object getObject([[maybe_unused]] unsigned index)
    {
        assert(index == 0);
        return Object(*this, getTag());
    }
 
    unsigned getPropertyCount() const
    {
        return 0;
    }
 
    PropertyConst getProperty(unsigned) const
    {
        return {};
    }
 
    Property getProperty(unsigned)
    {
        return {};
    }
 
    template <typename Item> const Item as(Tag tag) const
    {
        assert(getTag() == tag);
        if(getTag() != tag) {
            return {};
        }
        return Item(*parent, typeinfo().getObject(tag), dataRef + propinfo().offset);
    }
 
    template <typename Item> Item as(Tag tag)
    {
        assert(getTag() == tag);
        if(getTag() != tag) {
            return {};
        }
        return Item(*parent, typeinfo().getObject(tag), dataRef + propinfo().offset);
    }
 
    template <typename Item> Item to(Tag tag)
    {
        setTag(tag);
        return Item(*parent, typeinfo().getObject(tag), dataRef + propinfo().offset);
    }
};
 
template <class ClassType> class UnionTemplate : public Union
{
public:
    using Union::Union;
};
 
template <class UpdaterType, class ClassType> class UnionUpdaterTemplate : public ClassType
{
public:
    using ClassType::ClassType;
 
    explicit operator bool() const
    {
        return Object::operator bool() && this->isWriteable();
    }
};
 
} // namespace ConfigDB