entity SelectorWithHiZ_using_Generate is
  generic (
      candidates_num : integer := 8);
  port (
      candidates : in std_logic_vector(candidates_num - 1 downto 0);
      selects : in std_logic_vector(candidates_num - 1 downto 0);
      result : out std_logic);
end SelectorWithHiZ_using_Generate;

architecture Behavioral of SelectorWithHiZ_using_Generate is
begin

  gen : for i in selects'range generate
    result <= candidates(i) when selects(i) = '1'
        else 'Z';
  end generate;
end Behavioral;