#DIM ALL / #DIM NONE

Syntax:
#DIM ALL
#DIM NONE

Description

The #DIM ALL and #DIM NONE directives control whether variables must be explicitly declared before use. This is a compile-time directive that affects the entire source file from the point it appears.

#DIM ALL — Requires all variables to be explicitly declared using LOCAL, STATIC, GLOBAL, or DIM before they can be used. Using an undeclared variable produces a compile-time error.
#DIM NONE — (Default) Allows implicit variable declaration. Variables used without prior declaration are automatically created as variant-capable locals scoped to the current procedure.

Using #DIM ALL is strongly recommended for catching typos and enforcing disciplined variable management.

Parameters

Parameter	Description
(none)	This directive takes no parameters. It is placed on its own line to set the variable declaration mode.

Example

#DIM ALL

FUNCTION PBMAIN() AS LONG
    LOCAL x AS LONG
    LOCAL name AS STRING

    x = 42
    name = "PBXA64"
    PRINT name; " value: "; x

    ' This would cause an error with #DIM ALL:
    ' y = 99   ' ERROR: Undeclared variable

    FUNCTION = 0
END FUNCTION

Notes

#DIM ALL can be placed multiple times in a file but its effect is global; the last occurrence before any code determines the mode.
In PBXA64, #DIM ALL is the recommended default for production code.
When #DIM NONE is active (or no directive is given), variables spring into existence on first assignment and default to the variant type. This can lead to subtle bugs.
The directive does not affect pre-declared intrinsic types (LONG, DWORD, STRING, etc.).