Out (keyword)

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The out keyword causes arguments to be passed into method by reference. Similar to var, but it does not need to be initialized by the caller.

Example

method Method1(out i: Integer);
begin
  i := 44;
end;

method Method2;
begin
  var value: Integer;
  Method1(out value);
  // value is now 44
end;

The .NET runtime does not really support out params though, so when you define them in Delphi Prism (or C#) they are really just var parameters with that attribute. The compiler doesn't really treat the [Out] attribute as special, but just uses it when it finds the out keyword.

See Also

• Special Attributes
• var keyword

Area: Oxygene Language
Compiler version: Oxygene 5

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