create_array.hpp

 
#ifndef UFO_UTILITY_CREATE_ARRAY_HPP
#define UFO_UTILITY_CREATE_ARRAY_HPP
 
// STL
#include <array>
#include <utility>
 
namespace ufo
{
// Utility functions for creating std::array filled with a repeated value.
// Source: https://stackoverflow.com/a/57757301
 
namespace detail
{
template <class T, std::size_t... Is>
[[nodiscard]] constexpr std::array<T, sizeof...(Is)> createArray(
    T value, std::index_sequence<Is...>)
{
    // cast Is to void to remove the warning: unused value
    // Each element is initialized to 'value' using parameter pack expansion
    return {{(static_cast<void>(Is), value)...}};
}
}  // namespace detail
 
template <std::size_t N, class T>
[[nodiscard]] constexpr std::array<T, N> createArray(T const& value)
{
    // Calls the helper with an index sequence to expand the value N times
    return detail::createArray(value, std::make_index_sequence<N>());
}
}  // namespace ufo
 
#endif  // UFO_UTILITY_CREATE_ARRAY_HPP