::make_array

#include <array>
#include <type_traits>
#include <utility>

namespace details {

  template<typename ValueType, typename... Args>
  using array_value_type = typename std::conditional<

    std::is_same<ValueType, void>::value,
    typename std::common_type<Args...>::type,
    ValueType

  >::type;

  template<typename ValueType, typename... Args>
  using make_array_t = std::array<array_value_type<ValueType, Args...>, sizeof...(Args)>;

}

template<typename ValueType = void, typename... Args>
constexpr auto make_array(Args&&... args) -> details::make_array_t<ValueType, Args&&...> {
  return details::make_array_t<ValueType, Args&&...>{std::forward<Args>(args)...};
}