When i was reading the System.pas source code , i found a mysterious keyword : align !!

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When i was reading the System.pas source code , i found a mysterious keyword : align !! 
Unlike the directive align keyword $Align , this one can align the record size  (not the record field ) : 

type
  TM128 = Record
    V: Byte;
  end align 16; // SizeOf(TM128) = 16 bytes !!

Supported bytes align : 1,2,4,8, and 16 .

I have not found any of documentation ..
Does anyone know when this keyword was introduced ?

Comments

  1. Carlos LeiteApril 26, 2014 at 9:51 AM

    I think it's very old, Turbo Pascal maybe, to increase performance of pointers (at the expense of memory)

    ReplyDelete
  2. Thomas Mueller (dummzeuch)April 26, 2014 at 10:16 AM

    I never heard about this keyword, so I doubt that it is from Turbo Pascal.

    ReplyDelete
  3. Stefan GlienkeApril 26, 2014 at 12:19 PM

    See this SO answer: http://stackoverflow.com/a/8480027/587106

    ReplyDelete
  4. Mahdi SafsafiApril 27, 2014 at 1:28 AM

    Stefan , this answer the question .. thank you .

    ReplyDelete

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