Function (Member)
Declares or defines a member procedure returning a value.
{ Type | Class | Union } typename
Function typename.fieldname ( [ parameters ] ) As datatype
typename
fieldname
Function members are accessed with Operator . (Member Access) or Operator -> (Pointer To Member Access) to call a member procedure that returns a value. 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.
A Static (Member) may be declared using the Static specifier. A Const (Member) may be declared using the Const specifier.
Syntax
{ Type | Class | Union } typename
Declare [ Static | Const ] Function fieldname [calling convention specifier] [ Alias external_name ] ( [ parameters ] ) As datatype [ Static ]
End { Type | Class | Union }Function typename.fieldname ( [ parameters ] ) As datatype
statements
End FunctionParameters
typename
fieldname
name of the procedure
external_namename of field as seen when externally linked
parameters the parameters to be passed to the procedure
calling convention specifier Description
Function members are accessed with Operator . (Member Access) or Operator -> (Pointer To Member Access) to call a member procedure that returns a value. 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.
A Static (Member) may be declared using the Static specifier. A Const (Member) may be declared using the Const specifier.
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
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
Dialect Differences
- Only available in the -lang fb dialect.
See also
