evtvar.h

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/*************************************************************************
 *
 * Copyright (C) 2022 - 2025 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, see <https://www.gnu.org/licenses/>.
 **************************************************************************/
 
#ifndef Observable_EVTVAR_H
#define Observable_EVTVAR_H
 
#include <atomic>
#include <memory>
#include <string>
 
#include "observable.h"
 
namespace obs {
class EventVar : public Observable {
public:
  EventVar() : Observable(Autokey()) {}
 
  void Notify() override { Observable::Notify("", nullptr); }
 
  void Notify(void* data) { Observable::Notify("", data); }
 
  void Notify(const std::string& s) { Observable::Notify(s, nullptr); }
 
  void Notify(int n, const std::string& s) {
    Observable::Notify(nullptr, s, n, nullptr);
  }
 
  void Notify(int n, void* p) { Observable::Notify(nullptr, "", n, p); }
 
  void Notify(const std::shared_ptr<void>& p, const std::string& s, int n = 0) {
    Observable::Notify(p, s, n, nullptr);
  }
 
  void Notify(const std::shared_ptr<const void>& p) override {
    Observable::Notify(p, "", 0, nullptr);
  }
 
private:
  static std::string Autokey() {
    static std::atomic<unsigned long> last_ix(0);
    return std::string("!@%/+") + std::to_string(last_ix++);
  }
};
 
}  // namespace obs
 
#endif  // Observable_EVTVAR_H