Why can't I increment this `std_logic_vector`

Question

What\'s going on here? Why am I getting an \'operator argument type mismatch\', and what can I do to fix it?

--
-- 32-bit counter with enable and async reset         


        

Answer 1

Try this code:

use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
...
nextvalue <= value + "1";

In my case this solution is works!