ocobserv.h

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#pragma once
 
#include "oc_ansi.h"
 
#include <InterViews/observe.h>
 
struct Object;
struct cTemplate;
 
// For an Observer watching a hoc Object
// when the last ref disappears, disconnect is called on the Observer
// Some objects may be written so that update gets called  on the Observer
 
class ObjObservable: public Observable {
  public:
    static void Attach(Object*, Observer*);
    static void Detach(Object*, Observer*);
    virtual ~ObjObservable();
 
    Object* object() {
        return ob_;
    }
 
  private:
    ObjObservable(Object*);
 
  private:
    Object* ob_;
};
 
// For an Observer watching a cTemplate
class ClassObservable: public Observable {
  public:
    // only the first two guarantee an update on the Observer
    enum { Delete, Create, Changed };
 
    static void Attach(cTemplate*, Observer*);
    static void Detach(cTemplate*, Observer*);
    virtual ~ClassObservable();
 
    cTemplate* ctemplate() {
        return ct_;
    }
    Object* object() {
        return ob_;
    }
    int message() {
        return message_;
    }
 
  private:
    friend void hoc_template_notify(Object*, int);
    ClassObservable(cTemplate*);
    void attach(Observer*);
    void detach(Observer*);
 
  private:
    cTemplate* ct_;
    Object* ob_;
    int message_;
    int cnt_;
};