SCOPE...END SCOPE
Statement to begin a new scope block
Syntax:
Scope
[statements]
End ScopeDescription:
The Scope block allows variables to be (re)defined and used locally in a program.
When a variable is (re)defined with Dim within a scope structure, this local working variable can be used from its (re)definition until the end of the scope. During this time, any variables outside the scope that have the same name will be ignored, and will not be accessible by that name. Any statements in the Scope block before the variable is redefined will use the variable as defined outside the Scope.
The local variables are reserved on stack at granularity level of each procedure (including the main part of the program), not at granularity level of each individual scope block. So a same memory space can be used by local variables belonging to different scope blocks.
To access duplicated symbols defined as global outside the scope block, add one or preferably two dot(s) as prefix: .SomeSymbol or preferably ..SomeSymbol (or only ..SomeSymbol if inside a With..End With block).
Scope..End Scope is not permitted when compiling with in the -lang qb dialect.
When a variable is (re)defined with Dim within a scope structure, this local working variable can be used from its (re)definition until the end of the scope. During this time, any variables outside the scope that have the same name will be ignored, and will not be accessible by that name. Any statements in the Scope block before the variable is redefined will use the variable as defined outside the Scope.
The local variables are reserved on stack at granularity level of each procedure (including the main part of the program), not at granularity level of each individual scope block. So a same memory space can be used by local variables belonging to different scope blocks.
To access duplicated symbols defined as global outside the scope block, add one or preferably two dot(s) as prefix: .SomeSymbol or preferably ..SomeSymbol (or only ..SomeSymbol if inside a With..End With block).
Scope..End Scope is not permitted when compiling with in the -lang qb dialect.
Examples:
Dim As Integer x = 5, y = 2
Print "x ="; x; ", "; "y ="; y
Scope
Dim x As Integer = 3
Print "x ="; x; ", "; "y ="; y
Scope
Dim y As Integer = 4
Print "x ="; x; ", "; "y ="; y
End Scope
End Scope
Print "x ="; x; ", "; "y ="; y
Print "x ="; x; ", "; "y ="; y
Scope
Dim x As Integer = 3
Print "x ="; x; ", "; "y ="; y
Scope
Dim y As Integer = 4
Print "x ="; x; ", "; "y ="; y
End Scope
End Scope
Print "x ="; x; ", "; "y ="; y
Dialect Differences:
- Explicit Scope..End Scope blocks are available only in the -lang fb and -lang deprecated dialects.
- Explicit Scope..End Scope blocks are not available in the -lang fblite and -lang qb dialects.
Differences from QB:
- New to FreeBASIC
See also:
Back to Variable Declarations
