nimforum mirror - TR template involving Slice

Henry (orginal) [2015-08-31T11:50:23+02:00] view original

I am trying to optimize string slice comparison using a TR template but it is not being applied as expected. I have tried using Slice[Natural] as a type and also explicitly including the .. operator in the expression. Here is a simple example to demonstrate the problem:

let str = "Hello World"

template sliceCmpOpt*{s1[r] == s2}(s1: string; r: Slice[Natural]; s2: string): bool =
  echo "Should be here"
  false

if str[1..3] == "ell":
  echo "Should not be here"

Alternatively:

template sliceCmpOpt*{s1[l..h] == s2}(s1: string; l,h: Natural; s2: string): bool =
  echo "Should be here"
  false

neither work. Am I doing something obviously wrong or is there a trick to TR templates with ranges/slices?

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1595 :: TR template involving Slice