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private:
/*************************************************************************
Copy constructor and assignment usage is denied.
*************************************************************************/
Logger(const Logger& logger) : Singleton <Logger>() {}
Logger& operator=(const Logger& logger) {return *this;}
Would be better as
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Logger(const Logger&) ;
Logger& operator=(const Logger&);
As they are not callable if for some reason you do not want to do this then atleast use the following
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Logger(const Logger& logger) : Singleton <Logger>() {(void)logger;}
Logger& operator=(const Logger& logger) {(void)logger;return *this;}
