将Nim枚举转换为整数

Question

是否可以将枚举（或字符串）转换为其int值？

type
    CarBrands = enum
        Audi, BMW, Mercedes, Proton

convertsEnumToInt[CarBrands]("Audi") # returns 0
convertsEnumToInt[CarBrands]("Proton") # returns 3

Answer 1

根据documentation，您可以使用ord函数。

type
  CompassDirections = enum
    cdNorth, cdEast, cdSouth, cdWest

for direction in ord(low(CompassDirections))..
                 ord(high(CompassDirections)):
  echo CompassDirections(direction), " ord: ", direction

var ordinal = low(int)
inc ordinal
dec ordinal
echo high(char)