#include <array>
#include <cstdio>
#include <iostream>
#include <string>

template <size_t N>
constexpr static const int find(const std::array<int, N> &values, const int item) {
    for (size_t i = 0; i < values.size(); ++i) {
        if (values[i] == item)
            return i;
    }
    constexpr const int not_found = -1;
    return not_found;
}

int main() {
    constexpr static std::array<int, 10> values{1, 2, 3, 4, 4, 6, 1, 2, 5, 10};
    constexpr static const int item = 5;
    constexpr static int pos = find(values, item);
    std::printf("indxx: %d\n", pos);
    return 0;
}

// compiles to without optimizations

/*
.LC0:
       .string "indxx: %d\n"
main:
       push    rbp
       mov     rbp, rsp
       mov     esi, 8
       mov     edi, OFFSET FLAT:.LC0
       mov     eax, 0
       call    printf
       mov     eax, 0
       pop     rbp
       ret
*/