hash_switch.cpp

constexpr size_t operator""_str(const char* str, size_t size) noexcept
{
    size_t digest = 0;
    while (size-- > 0) {
        char val = *str;
        digest ^= val * val ^ val;  // worst hash algorithm
        ++str;
    }
    return digest;
}

struct sstring : public std::string
{
    using std::string::string;
    operator std::size_t() noexcept(noexcept(std::string::c_str()))
    {
        return operator""_str(std::string::c_str(), std::string::size());
    }
};


int main(int argc, int** argv) {

    sstring str = "lambda";

    switch (str) {
    case "ahmed"_str:
        cout << "you're ahmed\n";
        break;
    case "lambda"_str:
        cout << "You're wierd\n";
        break;
    }
    return 0;
}