Function (Member)member

Declares or defines a member procedure returning a value

Syntax

{ Type | Class | Union } typename

Declare [ Static | Const ] Function fieldname [calling convention specifier] [ Alias external_name ] ( [ parameters ] ) [ ByRef ] As datatype [ Static ]

End { Type | Class | Union }

Function typename.fieldname ( [ parameters ] ) [ ByRef ] As datatype [ Export ]

statements

End Function

Parameters

Description

Function members are accessed with Operator . (Member Access) or Operator -> (Pointer To Member Access) to call a member procedure that returns a value (a reference can also be returned by specifying Byref As return_type). The procedure 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 Function 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.

As for a normal Function, the return value of a Function member can be ignored in the calling code.

Remarks

Dialect Differences

• Only available in the -lang fb dialect.
  
  

See also

• Class
  
• Function
  
• Sub (Member)
  
• Type
  
  

Example

#include "vbcompat.bi"



Type Date



  value As Double



  Declare Static Function Today() As Date



  Declare Function Year() As Integer

  Declare Function Month() As Integer

  Declare Function Day() As Integer



End Type



Function Date.Today() As Date

  Return Type(Now())

End Function



Function Date.Year() As Integer

  Return ..Year(value)

End Function



Function Date.Month() As Integer

  Return ..Month(value)

End Function



Function Date.Day() As Integer

  Return ..Day(value)

End Function



Dim d As Date = Date.Today



Print "Year  = "; d.Year

Print "Month = "; d.Month

Print "Day   = "; d.Day

Reference

• Documented in KeyPgMemberFunction.html