Sequence array initialization with template

Question

I want to initialize an array with a sequence of ints from 0 to N - 1

#include 
#include          


        

Answer 1

I'm not sure if this meets your requirements.

#include <array>
#include <iostream>

template <size_t ...I>
constexpr auto init(std::index_sequence<I...>) {
    return std::array<size_t, sizeof...(I)>{I...};
}

int main(void)
{
    std::array<size_t, 10> a = init(std::make_index_sequence<10>());

    for (int const & i : a)
        std::cout << i << "\n";
    return 0;
}