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A word about ‘out’ parameters in Delphi

The Programming Works – Delphi compiler has a contract – any interface variable should be either a valid reference or nil. The same also applies to other lifetime managed types – strings and dynamic arrays. An interesting consequence of the contract is how Delphi interprets ‘out’ function parameters. As the name suggests, ‘out’ means that an input value of a parameter should be ignored inside a function; but Delphi compiler cannot ignore input value of a lifetime managed instance. It decrements the reference count of an instance when an instance is no longer needed if a reference to instance is not nil. As a ...
Favorite? Off-Topic? Serg @ 2012-10-01 12:37


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