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Sharedkeyword

Variable declaration modifier specifying visibility throughout a module

Variable Declarationskeyworddocumented

Syntax

Dim Shared ...
ReDim Shared ...
Common Shared ...
Static Shared ...
[Static] Var Shared ...

Description


Shared makes module-level variables visible inside Subs and Functions.
If Shared is not used on a module-level variable's declaration, the variable is only visible to the module-level code in that file (furthermore, only a variable declared with Dim without Shared modifier, and not inside a Namespace block, is stored on the stack).

NOTES (for Shared variables excluding Common variables):
    • Generally a Shared variable may only be initialized with a constant value (its starting value is set at the start of the program in the .data section before any code is run, and so it cannot depend on any variables or functions in it).
    • A first exception is a Shared variable of var-len string type, that never can be initialized, even with a constant string (because of its structure with a descriptor in the .data section, but to point to a dynamic memory block).
    • A second exception is a Shared variable of user-defined type having a constructor even implicit, that can be initialized with a non-constant value (because it's the constructor code, called when the program starts, which writes the "initial" values into the .data section).


To access from a local scope block to duplicated symbols of Shared variables defined in the global namespace, add one or preferably two dot(s) as prefix: .SomeSymbol or preferably ..SomeSymbol (or only ..SomeSymbol if inside a With..End With block).

Remarks

Differences from QB


  • The Shared statement inside scope blocks -- functions, subs, if/thens, and loops -- is not supported. Use Dim|Redim|Common|Static Shared in the main program instead. Or if you're inside a scope block and Redimming a variable or array previously set up with Shared, just do a Redim without Shared; it will work fine and won't ruin anything.

See also


Example


'' Compile with -lang qb or fblite



'$lang: "qb"



Declare Sub MySub

Dim Shared x As Integer

Dim y As Integer



x = 10

y = 5



MySub



Sub MySub

    Print "x is "; x 'this will report 10 as it is shared

    Print "y is "; y 'this will not report 5 because it is not shared

End Sub


Reference

  • Documented in KeyPgShared.html