c++ - how do I allocate a pointer to a class with multiple inheritance -

suppose have:

class human {     string choice; public:     human(string); };  class computer {     string compchoice; public:     computer(string); };  class refree : public human, public computer { public:     string findwinner(); };  int main() {     human* h1 = new human("name");     computer* c1 = new computer("ai");     refree* r1 = new refree(); } 

this code fails compile with:

 in function 'int main()': error: use of deleted function 'refree::refree()' note: 'refree::refree()' implicitly deleted because default definition  ill-formed: error: no matching function call 'human::human()' note: candidates are: note: human::human(std::string) note:   candidate expects 1 argument, 0 provided 

why fail, , how can construct pointer refree?

since human , computer have user-declared constructors take argument, default constructors implicitly deleted. in order construct them, need give them argument.

however, trying construct refree without arguments - implicitly tries construct of bases without arguments. impossible. setting aside whether or not makes sense both human , computer, @ least have like:

refree() : human("human name") , computer("computer name") { } 

more likely, want provide constructor takes 1 or both names, e.g.:

refree(const std::string& human, const std::string& computer) : human(human) , computer(computer) { }