In Delphi, pointers are used to store the memory address of a variable. You can use pointers to manipulate the memory directly and to pass variables to procedures by reference.
To declare a pointer variable, you can use the ^ operator, followed by the type of the variable that the pointer will reference. For example, to declare a pointer to an integer, you can use the following syntax;
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var pInt ^Integer; |
To create a pointer to an existing variable, you can use the @ operator, followed by the name of the variable. For example
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var i Integer; pInt ^Integer; begin i = 10; pInt = @i; |
To dereference a pointer and access the value of the variable it points to, you can use the ^ operator followed by the pointer variable. For example
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pInt^ = 20; // Sets the value of i to 20 |
You can also use the @ operator to pass a variable to a procedure by reference, allowing the procedure to modify the value of the variable. For example
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procedure Increment(var Value Integer); begin Inc(Value); end; var i Integer; begin i = 10; Increment(i); // i is now 11 |
Pointers can be a powerful tool in Delphi, but they should be used with caution as they can be difficult to work with and can lead to difficult-to-debug errors if used improperly.
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