shared_member_for_template_classes.cpp

#include <iostream>

class BaseOutputter {
public:
    static void set_prefix_message(const std::string& msg) { 
        prefix_message = msg;   
    }
    
protected:
    BaseOutputter() = default;
    static std::string prefix_message;
};

std::string BaseOutputter::prefix_message = "Value is ";

template<class T>
class Outputter : public BaseOutputter {
public:
    Outputter(const T& val) {
        value = val;
    }
    
    void output() {
        std::cout << prefix_message << value << std::endl;   
    }
    
private:
    T value;
};

int main()
{
    Outputter<int> intOutputter(1);
    intOutputter.output();
    
    Outputter<float> floatOutputter(1.2f);
    floatOutputter.output();
    
    BaseOutputter::set_prefix_message("Value should be ");
    
    Outputter<std::string> strOutputter("this");
    strOutputter.output();
    
    return 0;
}