logger idea

#include <iostream>
#include <string>
#include <sstream>


class Log {
public:
    virtual void write(const char* msg) = 0;
    virtual std::string toString(){return logString;}
protected:
    std::string logString;
};

class ConsoleLog : public Log {
public:
    void write(const char* msg){s << msg << "\n"; logString += msg;}
protected:
    std::ostringstream s;
};

class StandardLog : public Log {
public:
    void write(const char* msg){std::cout << msg << std::endl; logString += msg;}
};

class Logger {
public:
    Logger(){log = new StandardLog();}
    Logger(Log* log){this->log = log;}
    void write(const char* msg){log->write(msg);}
    std::string toString(){return log->toString();}
protected:
    Log* log;// = new StandardLog();
};

int main()
{
    Logger logger;//new ConsoleLog());
    logger.write("this is a test message");
    std::cout << logger.toString() << std::endl;
    return 0;
}