observable_globvar.h

/*************************************************************************
 *
 * Project:  OpenCPN
 * Purpose:  global variables listen/notify wrapper.
 *
 * Copyright (C) 2022 Alec Leamas
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the
 * Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,  USA.
 **************************************************************************/
 
#ifndef _OBSERVABLE_GLOBVAR_H
#define _OBSERVABLE_GLOBVAR_H
 
#include <memory>
#include <string>
#include <vector>
 
#include <wx/event.h>
 
#include "observable.h"
 
template <typename T>
class GlobalVar : public Observable {
public:
  GlobalVar(T* ptr) : Observable(ptr_key(ptr)), variable(ptr) {}
 
  void Set(const T& arg) {
    *variable = arg;
    Observable::Notify();
  }
 
  const T Get() { return *variable; }
 
private:
  GlobalVar();  // not implemented
 
  T* const variable;
};
 
#endif  // _OBSERVABLE_GLOBVAR_H