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► KB ► To/From Guides ► ObjectPAL ► Language Details

Pointers (Cross Ref > Language Details)

By Mike Prestwood

ObjectPAL versus PHP: A side by side comparison between ObjectPAL and PHP.

Data Structures

Data structures allow you to store and work with data. Common data structures include arrays, associative arrays, etc.

Pointers

[Other Languages]

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).

ObjectPAL:

ObjectPAL doesn't have a developer defined pointer type except for use with DLLs where you use a special CPTR uses keyword to refer to a DLL string pointer data type.

Syntax Example: 1 certification question.

Uses Tapi32

  tapiRequestMakeCall(sNumber CPTR, sAppName CPTR,

    sLogName CPTR, sComment CPTR) CLONG

endUses

PHP: Not Supported

PHP supports references which allow you to refer to the value of a variable but PHP does not support true developer defined pointers. You cannot get and use the address of a variable.

However, you can still do inexpensive assignments by assigning by reference.