Namespace
 
Declares a namespace block

Syntax

Namespace identifier [ Alias "aliasname" ]
statements
End Namespace

Parameters

identifier
The name of the namespace.
aliasname
An alternate external name for the namespace.

Description

Namespaces are commonly used in libraries where you don't want all the symbols from that library to crowd the user's space (called the Global Namespace).

For example, if you used the "Forms" library, it might define the Point type for describing an X and Y coordinate, and you might also define it for another purpose. This can be resolved by creating the namespace Forms for the library, and then referring to its Point type as Forms.Point, and yours as just Point.

To access duplicated symbols defined in the global namespace use: .SomeSymbol (or ..SomeSymbol if inside a With..End With block).

Example

Namespace Forms
    Type Point '' A 2D point
        As Integer x
        As Integer y
    End Type
    '' Since we are inside of the namespace, Point resolves to Forms.Point.
    Sub AdjustPoint( ByRef pt As Point, ByVal newx As Integer, ByVal newy As Integer )
        pt.x = newx
        pt.y = newy
    End Sub
End Namespace

Type Point '' A 3D point
    As Integer x
    As Integer y
    As Integer z
End Type

Sub AdjustPoint( ByRef pt As Point, ByVal newx As Integer, ByVal newy As Integer, ByVal newz As Integer )
    pt.x = newx
    pt.y = newy
    pt.z = newz
End Sub

Dim pt1 As Point
AdjustPoint( pt1, 1, 1, 1 )
Dim pt2 As Forms.Point
Forms.AdjustPoint( pt2, 1, 1 )


Dialect Differences

  • Namespaces are not supported in the -lang qb dialect.

Differences from QB

  • New to FreeBASIC

See also