C++ Riddle - Feb-02, 2022

#CppRiddle

While implementing a variadic max function, with the signature:

template<class T, class... Ts>
auto my_max(const T& t, const Ts&... ts) { /* ... */ }

It appears that gcc and clang disagree on the question of who is bigger: welcome or hi:

Explain this weird result, who is right? can it be both?

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No one is right or wrong the comparation between “welcome” and “bye” is address comparation and in our example the address layout of “welcome” under gcc or clang is smaller/bigger then “bye” which explain the difference between the compilers. After that the result is compared with std::string (“hi”) which means that the previous result is implicit cast to std::string and the 2 strings are compared.

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