I am trying to use template with two different proc like below,
type
Person = object
name: string
job: string
email: string
var jerry = Person(name: "JK", job: "engineer", email:"N/A")
proc printA[T](x: T) =
echo x
proc printB[T](x: T) =
for field, value in x.fieldPairs:
echo field, value
Run
template printIt*[T](x: T) =
let o = astToStr(x).split(".")
case o.len:
of 2 :
x.printA()
else:
discard
Run
the above code works , but when I try below, it failed.
template printIt*[T](x: T, dir: string) =
let o = astToStr(x).split(".")
case o.len:
of 2 :
x.printA()
of 1 :
x.printB()
else:
discard
Run
here is test code and error output
jerry.printIt(). # len == 1, should call x.printB()
jerry.job.printIt() # len == 2, should call x.printA()
Run
template/generic instantiation of `printIt` from here
template/generic instantiation of `printB` from here
Error: type mismatch
Expression: fieldPairs(x)
[1] x: string
Expected one of (first mismatch at [position]):
[1] iterator fieldPairs[S: tuple | object; T: tuple | object](x: S; y: T):
tuple[
key: string, a, b: RootObj]
[1] iterator fieldPairs[T: tuple | object](x: T): tuple[key: string, val:
RootObj]
Run
