On Sun, 19 Aug 2012 05:52:01 +0200, Walter Bright
<[email protected]> wrote:
On 8/18/2012 8:31 PM, Adam D. Ruppe wrote:
enum BOOL {
TRUE,
FALSE,
FILE_NOT_FOUND
}
I used to work with digital electronics. There, "boolean" logic actually
had 4 states:
True
False
Don't Know
Don't Care
Like someone on Reddit mentioned, VHDL has 9 boolean states:
'U': uninitialized. This signal hasn't been set yet.
'X': unknown. Impossible to determine this value/result.
'0': logic 0
'1': logic 1
'Z': High Impedance
'W': Weak signal, can't tell if it should be 0 or 1.
'L': Weak signal that should probably go to 0
'H': Weak signal that should probably go to 1
'-': Don't care.
--
Simen
