Macros

macro caster(def): untyped

a sugar for casting parameters in the procedure body, It eliminates the need for manually casting.

for an illustration, the 2 procedures are the same:

Example:

proc toNumericRepr1(c: char): string = 
  let b = cast[byte](c)
  $b

proc toNumericRepr2(b: char as byte): string {.caster.} = 
  $b

assert "97" == toNumericRepr1 'a'
assert "97" == toNumericRepr2 'a'