example5_integer_sequence.cpp

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#include <utility>
#include <iostream>
#include <array>

template<typename T, T... Ints>
void printSequence(std::integer_sequence<T, Ints...> int_seq) {
    std::cout << "Sequence size: " << int_seq.size() << std::endl;
    std::cout << "Values: ";
    ((std::cout << Ints << ' '), ...);
    std::cout << std::endl;
}

template<typename T, std::size_t N, std::size_t... I>
void printArrayImpl(const std::array<T, N>& arr, std::index_sequence<I...>) {
    ((std::cout << arr[I] << ' '), ...);
    std::cout << std::endl;
}

template<typename T, std::size_t N>
void printArray(const std::array<T, N>& arr) {
    printArrayImpl(arr, std::make_index_sequence<N>{});
}

int main() {
    printSequence(std::integer_sequence<int, 1, 2, 3, 4, 5>{});
    printSequence(std::make_integer_sequence<int, 5>{});
    printSequence(std::make_index_sequence<5>{});

    std::array<int, 5> arr = {10, 20, 30, 40, 50};
    std::cout << "Array contents: ";
    printArray(arr);

    return 0;
}