testing generically for proximity to the end of a structure.

main.cpp

#include <string>
#include <iostream>
#include <vector>
#include <array>

template<typename T>
void printElemes(T elems) {
    std::cout << "[ ";
    for (auto itr = elems.begin(); itr != elems.end(); ++itr) {
        std::cout << *itr;
        if (itr + 1 != elems.end()) std::cout << ", ";
    }
    std::cout << " ]\n";
}

int main() {
    std::vector<uint64_t> vec{1, 2, 3, 4, 5, 6};
    printElemes(vec);
    
    std::array<uint64_t, 5> ary{1, 2, 3, 4, 5};
    printElemes(ary);
    
    return 0;
}