| 1 | #pragma once | 
|---|---|
| 2 | |
| 3 | /// Multiple Boolean values. That is, two Boolean values: can it be true, can it be false. | 
| 4 | struct BoolMask | 
| 5 | { | 
| 6 | bool can_be_true = false; | 
| 7 | bool can_be_false = false; | 
| 8 | |
| 9 | BoolMask() {} | 
| 10 | BoolMask(bool can_be_true_, bool can_be_false_) : can_be_true(can_be_true_), can_be_false(can_be_false_) {} | 
| 11 | |
| 12 | BoolMask operator &(const BoolMask & m) | 
| 13 | { | 
| 14 | return BoolMask(can_be_true && m.can_be_true, can_be_false || m.can_be_false); | 
| 15 | } | 
| 16 | BoolMask operator |(const BoolMask & m) | 
| 17 | { | 
| 18 | return BoolMask(can_be_true || m.can_be_true, can_be_false && m.can_be_false); | 
| 19 | } | 
| 20 | BoolMask operator !() | 
| 21 | { | 
| 22 | return BoolMask(can_be_false, can_be_true); | 
| 23 | } | 
| 24 | }; | 
| 25 | 
