Sub Member

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Sub (Member)

Declares or defines a member procedure

Syntax

{ Type | Class | Union } typename
Declare [ Static | Const ] Sub fieldname [calling convention specifier] [ Alias external_name ] ( [ parameters ] ) [ Static ]
End { Type | Class | Union }
Sub typename.fieldname ( [ parameters ] ) [ Export ]
statements
End Sub

Parameters

• typename
• fieldname
• external_name
• parameters
• calling convention specifier

Description

Sub members are accessed with Operator . (Member Access) or Operator -> (Pointer To Member Access) to call a member procedure and may optionally accept parameters either ByVal or ByRef. typename be overloaded without explicit use of the Overload keyword.

typename is the name of the type for which the Sub method is declared and defined. Name resolution for typename follows the same rules as procedures when used in a Namespace.

A hidden This parameter having the same type as typename is passed to non-static member procedures. This is used to access the fields of the Type, Class, or Union.
To access duplicated symbols defined as global outside the Type, add one or preferably two dot(s) as prefix: .SomeSymbol or preferably ..SomeSymbol (or only ..SomeSymbol if inside a With..End With block).

A Static (Member) may be declared using the Static specifier. A Const (Member) may be declared using the Const specifier.

Remarks

Dialect Differences

• Only available in the -lang fb dialect.

See also

• Class
• Function (Member)
• Sub
• Type

Examples

Type Statistics

  count As Single

  sum As Single

  Declare Sub AddValue( ByVal x As Single )

  Declare Sub ShowResults( )

End Type

Sub Statistics.AddValue( ByVal x As Single )

  count += 1

  sum += x

End Sub

Sub Statistics.ShowResults( )

  Print "Number of Values = "; count

  Print "Average          = ";

  If( count > 0 ) Then

    Print sum / count

  Else

    Print "N/A"

  End If

End Sub

Dim stats As Statistics

stats.AddValue 17.5

stats.AddValue 20.1

stats.AddValue 22.3

stats.AddValue 16.9

stats.ShowResults

Output:

Number of Values =  4
Average          =  19.2

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Category: User Defined Types
Kind: member

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Reproduced from the FreeBASIC Wiki Manual under the GNU Free Documentation License 1.3 — with no Invariant Sections, no Front-Cover Texts and no Back-Cover Texts. Copyright © the FreeBASIC project and wiki contributors. See License.