#include <iostream>
#include <string>

int main() {
    auto hash = [](const char *src) consteval {
        int total{};
        for (int i = 0; src[i] != '\0'; ++i) {
            total += src[i];
        }
        const int buckets = 255;
        return total % buckets;
    };
    constexpr static auto h = hash("the key");
    constexpr static const char *key = "the key";
    constexpr static auto k = hash(key);
    std::cout << h << ":" << k << "\n";
    if (h != k) {
        std::cerr << "Error\n";
    }
    return 0;
}

/* compiles to in GCC 13.2
notice there is no .string "the key" its all done at compile time
*/

/*
.LC1:
        .string ":"
.LC2:
        .string "\n"
main:
        push    rbp
        mov     rbp, rsp
        sub     rsp, 16
        mov     esi, 172
        mov     edi, OFFSET FLAT:_ZSt4cout
        call    std::basic_ostream<char, std::char_traits<char> >::operator<<(int)
        mov     esi, OFFSET FLAT:.LC1
        mov     rdi, rax
        call    std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)
        mov     esi, 172
        mov     rdi, rax
        call    std::basic_ostream<char, std::char_traits<char> >::operator<<(int)
        mov     esi, OFFSET FLAT:.LC2
        mov     rdi, rax
        call    std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)
        mov     eax, 0
        leave
        ret
*/