component.h

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#pragma once
#include "ga/defines.h"
#include <memory>
 
namespace ga {
 
class Node;
class Scene;
 
class Component
{
public:
    Component()          = default;
    virtual ~Component() = default;
 
    Component( const Component& other )
    {
        // do not copy m_node
    }
 
    Component& operator=(const Component& other)
    {
        // do not copy m_node
        return *this;
    }
 
    std::shared_ptr<Node> getNode() const
    {
        return m_node.lock();
    }
 
protected:
    friend class Node;
 
    // called by Node
    virtual void update() {}
    virtual void draw() {}
    virtual void setNode( std::shared_ptr<Node> node )
    {
        m_node = node;
    }
    virtual void setScene( std::shared_ptr<Scene> scene ) {}
 
    std::weak_ptr<Node> m_node;  // node owner
};
 
}  // namespace ga