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#include <array>
#include <iostream>
template<int... n>
constexpr auto array()
{
return std::array<int,sizeof...(n)>{n...};
};
template<std::size_t N, std::size_t M>
constexpr auto multiply(const std::array<int, N>& arr1, const std::array<int, M>& arr2)
{
std::array<int, N* M> result{};
std::size_t index{ 0 };
for (std::size_t n = 0; n < N; n++)
{
for (std::size_t m = 0; m < M; m++)
{
result[index] = arr1[n] * arr2[m];
++index;
}
}
return result;
}
template<typename container_t>
void show(const char* msg, const container_t& values)
{
std::cout << msg << " : ";
bool comma{ false };
for (const auto& value : values)
{
if (comma) std::cout << ", ";
std::cout << value;
comma = true;
}
std::cout << "\n";
}
int main()
{
constexpr auto arr1 = array<1, 2, 3, 4>();
constexpr auto arr2 = array<10, 20>();
constexpr auto result = multiply(arr1, arr2);
static_assert(arr1[0] == 1, "");
static_assert(arr2[1] == 20, "");
static_assert(result[0] == 10, "");
static_assert(result[1] == 20, "");
static_assert(result[6] == 40, "");
show("arr1", arr1);
show("arr2", arr2);
show("result", result);
return 0;
}
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