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   ► KBProgrammingDelphi PrismLanguage Det...   Print This     
  From the June 2015 Issue of Prestwood eMag
 
Prism Language Details:
Delphi Prism Pointers
 
Posted 10 years ago on 3/14/2009
Prism Code Snippet:
 A flashcard from our Prism Flashcards Library
 A code snippet from our Prism Code Snippets Page

KB101962

General Info: Pointers / References

A pointer is a variable type that allows you to refer indirectly to another object. Instead of holding data, a pointer holds the address to data -- the address of another variable or object. You can change the address value a pointer points to thus changing the variable or object the pointer is pointing to.

A reference is a type of pointer that cannot change and it must always point to a valid storage (no nulls).

Delphi Prism Pointers

Although pointer data types in Prism coding are less important than in other languages such as C++, Prism does support developer defined pointers. Use the ^ operator to declare a pointer data type. Use the @ operator to return the current address of a variable.

In .Net managed coding the use of pointers is not safe because the garbage collector may move memory around. To safely use pointers, use the unsafe keyword. However, avoid unsafe code if possible.

More Info

Definition:  Pointers / References

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