Enumerations.md (594B)
1 +++ 2 title = 'Enumerations' 3 +++ 4 # Enumerations 5 enum (enumeration) — simple user-defined type, specifying its set of values as symbolic constants 6 7 by default, values of constants start with 0 and increment by 1 with each constant 8 9 you can give a constant a value from which the rest is incremented 10 11 e.g.: 12 13 ```cpp 14 enum class Month { 15 jan=1, feb, mar, apr, may, jun, jul, aug, sep, oct, nov, dec 16 }; 17 ``` 18 19 conversions: 20 21 ```cpp 22 Mont int_to_month(int x) { 23 if (x < int(Month::jan) || int(Month::dec) < x) 24 error(“bad month”); 25 return Month(x); 26 } 27 28 int m = 12; 29 Month mm = int_to_month(m); 30 ```