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881 :: initialize array - implicit type conversion

• kuba (orginal) [2015-02-16T21:33:24+01:00] view original

  Hi everyone, my first post in this forum!

  I'm just starting with Nim and wonder what is the most idiomatic way to initialize a uint array? I'd like to mix characters and ints if possible and let the compiler do appropriate casting for me. The following lines does not compile though:

  
  var test : array[3,uint] = ['B', 12,32]
  Run

  So far I need to cast individual (char elements elements myself which I admit is not very clean.

  
  var test : array[3,uint] = cast[array[3,uint]]([cast[uint]('B'), 12,32])
  Run

  Cheers, kuba

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• def (orginal) [2015-02-16T21:51:53+01:00] view original

  Make sure the first value in the array becomes a uint and the rest will be uints automatically, if they're number literals:

  var test: array[3, uint] = [uint 'B', 12, 32]
  var test2 = ['B'.uint, 12, 32]
  var test3 = [uint 'B', 12, 32, uint 'c'] # if there are any more characters, you have to convert them explicitly
  var test4 = [200u, 300, 400] # a u or 'u suffix works for number literals
  Run

  Type casts should be your last resort. In this case a simple type conversion with uint() works.

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