44 lines
No EOL
1.6 KiB
C++
44 lines
No EOL
1.6 KiB
C++
#pragma once
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#include "metadata.h"
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#include <memory>
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#include <optional>
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#include <string>
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// Struct describing information about an instance
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struct InstanceType {
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InstanceType* super; // May be null
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std::string className;
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InstanceConstructor constructor;
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std::string explorerIcon = "";
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};
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// Base class for all instances in the data model
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// Note: enable_shared_from_this HAS to be public or else its field will not be populated
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// Maybe this could be replaced with a friendship? But that seems unnecessary.
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// https://stackoverflow.com/q/56415222/16255372
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class Instance : public std::enable_shared_from_this<Instance> {
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private:
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std::optional<std::weak_ptr<Instance>> parent;
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std::vector<std::shared_ptr<Instance>> children;
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protected:
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Instance(InstanceType*);
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virtual ~Instance();
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virtual void OnParentUpdated(std::optional<std::shared_ptr<Instance>> oldParent, std::optional<std::shared_ptr<Instance>> newParent);
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public:
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static InstanceType* TYPE;
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std::string name;
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// Instance is abstract, so it should not implement GetClass directly
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virtual InstanceType* GetClass() = 0;
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void SetParent(std::optional<std::shared_ptr<Instance>> newParent);
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std::optional<std::shared_ptr<Instance>> GetParent();
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inline const std::vector<std::shared_ptr<Instance>> GetChildren() { return children; }
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// Utility functions
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inline void AddChild(std::shared_ptr<Instance> object) { object->SetParent(this->shared_from_this()); }
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};
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typedef std::shared_ptr<Instance> InstanceRef;
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typedef std::weak_ptr<Instance> InstanceRefWeak; |