Singleton.h

// Copyright (c) 2016-2020 Kiwano - Nomango
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
 
#pragma once
 
namespace kiwano
{
 
template <typename _Ty>
class Singleton
{
public:
    using object_type = _Ty;
 
    static inline object_type& GetInstance()
    {
        return instance_;
    }
 
    static inline object_type* GetInstancePtr()
    {
        return &instance_;
    }
 
protected:
    Singleton()                            = default;
    Singleton(const Singleton&)            = delete;
    Singleton& operator=(const Singleton&) = delete;
 
    static _Ty instance_;
};
 
template <typename _Ty>
_Ty Singleton<_Ty>::instance_;
 
}  // namespace kiwano