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#include <type_traits>
#include <string>
 
template <typename Heir>
class SToString {
public:
    std::string toString() {
        return static_cast<Heir*>(this)->toStringImpl();
    }
};
 
class Foo : public SToString<Foo> {
public:
    std::string toStringImplRRRRRRRRRRRRR() {
        return "Foo";
    }
};
 
int main() {
	Foo f;
 
	f.toString();
 
	return 0;
}

prog.cpp: In instantiation of ‘std::string SToString<Heir>::toString() [with Heir = Foo; std::string = std::basic_string<char>]’:
prog.cpp:22:13:   required from here
prog.cpp:8:55: error: ‘class Foo’ has no member named ‘toStringImpl’
         return static_cast<Heir*>(this)->toStringImpl();
                                                       ^
prog.cpp: In member function ‘std::string SToString<Heir>::toString() [with Heir = Foo; std::string = std::basic_string<char>]’:
prog.cpp:9:5: warning: control reaches end of non-void function [-Wreturn-type]
     }
     ^

Standard output is empty