singleton.h

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// WOLF - Copyright (C) 2020-2026
// Institut de Robòtica i Informàtica Industrial, CSIC-UPC.
// Authors: Joan Solà Ortega (jsola@iri.upc.edu) and
// Joan Vallvé Navarro (jvallve@iri.upc.edu)
// All rights reserved.
//
// This file is part of WOLF: http://www.iri.upc.edu/wolf
// WOLF is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 3
// as published by the Free Software Foundation.
//
// 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 <http://www.gnu.org/licenses/>.
#pragma once
 
#include <memory>
 
namespace wolf
{
namespace internal
{
template <class T>
class Singleton
{
    using SingletonOPtr = std::unique_ptr<T>;
 
  public:
    template <typename... Args>
    static T& get(Args&&... args)
    {
        static SingletonOPtr instance_(new T(std::forward<Args>(args)...));
 
        return *instance_;
    }
 
    constexpr Singleton(const Singleton&)  = delete;
    constexpr Singleton(const Singleton&&) = delete;
 
    constexpr Singleton& operator=(const Singleton&) const = delete;
    constexpr Singleton& operator=(const Singleton&&) const = delete;
 
  protected:
    constexpr Singleton() = default;
    virtual ~Singleton()  = default;
};
 
}  // namespace internal
}  // namespace wolf