What's the difference between ref attribute and var parameter?

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What's the difference between ref attribute and var parameter?

function FunctionName(const [Ref] parameter1: Class1Name; [Ref] const parameter2: Class2Name);

function DoubleByRef(var X: Integer): Integer;

Is it the same thing?

Comments

  1. 丽丽乌克January 19, 2017 at 7:09 PM

    Leif Uneus It's a useful feature!

    ReplyDelete
  2. Jacek LaskowskiJanuary 19, 2017 at 10:38 PM

    Leif Uneus what it might be useful? some simple example?

    ReplyDelete
  3. Leif UneusJanuary 19, 2017 at 11:56 PM

    Jacek Laskowski It is useful if you want to make sure that a const parameter is passed by reference.
    David Heffernan pretty much covers a simple use case here: stackoverflow.com - Is the [Ref] attribute for const record parameters useful?

    ReplyDelete

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