CppNet/base/Single.h

#ifndef HEADER_BASE_SINGLE
#define HEADER_BASE_SINGLE

#include <mutex>

namespace base {

    template<typename T>
    class CSingle {
    private:
        CSingle(const CSingle&);
        CSingle& operator = (const CSingle&);
    public:
        CSingle() {}
        virtual ~CSingle() {}
    
        static T& Instance() {
            std::unique_lock<std::mutex> lock(_mutex);
            static T instance;
            return instance;
        }
    
    private:
        static std::mutex    _mutex;
    };
    
    template<typename T>
    std::mutex    CSingle<T>::_mutex;
}
#endif