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#include <iostream>
#include <string>
 
class ADDON {
    std::string s;
 
public:
    ADDON() {
        s = "";
    }
 
    ADDON(std::string in) {
        s = in;
    }
 
    ADDON(const char in[]) {
        s = in;
    }
 
    void operator=(const std::string in) {
        s = in;
    }
 
    std::string getString() {
        return s;
    }
};
 
template<typename T>
void print_to_default_file(T &obj, ADDON addon = "")
{ std::cout << "first overload\n"; }
 
template<typename T>
void print_to_default_file(T &obj, std::string  objS) // or char* objS
{ std::cout << "second overload\n"; }
 
int main()
{
     print_to_default_file("test","where will I go");
}

prog.cpp: In function ‘int main()’:
prog.cpp:39:52: error: call of overloaded ‘print_to_default_file(const char [5], const char [16])’ is ambiguous
prog.cpp:39:52: note: candidates are:
prog.cpp:30:6: note: void print_to_default_file(T&, ADDON) [with T = const char [5]]
prog.cpp:34:6: note: void print_to_default_file(T&, std::string) [with T = const char [5]; std::string = std::basic_string<char>]

Standard output is empty