Simpler way to set multiple array slots to one value

Question

I\'m coding in C++, and I have the following code:

int array[30];
array[9] = 1;
array[5] = 1;
array[14] = 1;

array[8] = 2;
array[15] = 2;
array[23] = 2;
array[1         


        

Answer 1

struct _i_t
{
    int * array;


    struct s
    {
        int* array;
        std::initializer_list l;

        s const&   operator = (int value) const noexcept
        {
            for(auto i : l )
              array[i] = value;

            return *this;
        }
    };

    s operator []( std::initializer_list i ) const noexcept
    {
        return s{array, i};
    }
};

template< std::size_t N>
constexpr _i_t   _i( int(&array)[N]) noexcept { return {array}; }

int main()
{
  int a[15] = {0};
  _i(a)[{1,3,5,7,9}] =  7;

  for(auto x : a)std::cout << x << ' ';


}