System.h

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#ifndef _SYSTEM_H
#define _SYSTEM_H
 
#include <Environment.h>
#include <unordered_set>
 
class System {
public:  
    System(std::shared_ptr<Environment> environment, bool autoUpdate = true);
    
    void newEntity(int entity);
    
    void changeEnvironment(std::shared_ptr<Environment> environment);
    
    const size_t& getID();

    bool getChange();

    virtual void run() = 0;
 
protected: 
    std::unordered_set<int> entities;
    std::shared_ptr<Environment> environment;
    std::vector<std::string> desiredComponents;
    std::vector<std::string> rejectedComponents;
    std::vector<std::string> desiredTags;
    std::mutex mtx;

    void addComponent(const std::string& name);
    void addComponents(std::vector<std::string> names);

    void addRejected(const std::string& name);
    void addRejects(std::vector<std::string> names);

    void addTag(const std::string& tagName);
    void addTags(std::vector<std::string> names);
 
private:
    bool change;

    size_t ID;

    static size_t nextID;
};
 
inline size_t System::nextID = 0; // Initialize the nextID at 0.
 
#endif //_SYSTEM_H