{{fbdoc item="title" value="FUNCTION (Member)"}}----
Declares or defines a member procedure returning a value.

{{fbdoc item="syntax"}}##
	{ [[KeyPgType|Type]] | [[KeyPgClass|Class]] | [[KeyPgUnion|Union]] } //typename//
		[[KeyPgDeclare|declare]] [ [[KeyPgStaticMember|static]] | [[KeyPgConstMember|const]] ] **Function** //fieldname// [//calling convention specifier//] [ [[KeyPgAlias|alias]] //external_name// ] ( [ //parameters// ] ) [ [[KeyPgByrefFunction|byref]] ] [[KeyPgAs|as]] [[DataType|datatype]] [ [[KeyPgStatic|Static]] ]
	End { [[KeyPgType|Type]] | [[KeyPgClass|Class]] | [[KeyPgUnion|Union]] }
	
	**Function** //typename//.//fieldname// ( [ //parameters// ] ) [ [[KeyPgByrefFunction|byref]] ] [[KeyPgAs|as]] [[DataType|datatype]] [ [[KeyPgExport|Export]] ]
		//statements//
	**End Function**
##
{{fbdoc item="param"}}
	##//typename//## 
		name of the ##[[KeyPgType|Type]]##, ##[[KeyPgClass|Class]]##, or ##[[KeyPgUnion|Union]]##
	##//fieldname//## 
		name of the procedure
	##//external_name//##
		name of field as seen when externally linked
	##//parameters//## 
		the parameters to be passed to the procedure
	##//calling convention specifier//##	
		can be one of: ##[[KeyPgCdecl|Cdecl]]##, ##[[KeyPgStdcall|Stdcall]]## or ##[[KeyPgPascal|Pascal]]##

{{fbdoc item="desc"}}
	##**Function**## members are accessed with ##[[KeyPgOpMemberAccess|Operator . (Member access)]]## or ##[[KeyPgOpPtrMemberAccess|Operator -> (Pointer to member access)]]## to call a member procedure that returns a value (a reference can also be returned by specifying ##[[KeyPgByrefFunction|byref as]] //return_type//##).  The procedure may optionally accept parameters either ##[[KeyPgByval|byval]]## or ##[[KeyPgByref|byref]]##.  ##//typename//## be overloaded  without explicit use of the ##[[KeyPgOverload|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 ##[[KeyPgNamespace|Namespace]]##.
	
	A hidden ##[[KeyPgThis|this]]## parameter having the same type as ##//typename//## is passed to non-static member procedures.  ##[[KeyPgThis|this]]## is used to access the fields of the ##[[KeyPgType|Type]]##, ##[[KeyPgClass|Class]]##, or ##[[KeyPgUnion|Union]]##.
	To access duplicated symbols defined outside the Type, add one (or two) dot(s) as prefix: ##.""SomeSymbol""## (or ##..""SomeSymbol""## if inside a [[KeyPgWith|With..End With]] block).
	
	A ##[[KeyPgStaticMember|Static (Member)]]## may be declared using the ##**Static**## specifier.  A ##[[KeyPgConstMember|Const (Member)]]## may be declared using the ##**Const**## specifier.
	
	As for a normal ##[[KeyPgFunction|Function]]##, the return value of a ##**Function**## member can be ignored in the calling code.

{{fbdoc item="ex"}}
{{fbdoc item="filename" value="examples/manual/udt/function.bas"}}%%(freebasic)
#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

%%

{{fbdoc item="lang"}}
	- Only available in the //[[CompilerOptlang|-lang fb]]// dialect.

{{fbdoc item="see"}}
	- ##[[KeyPgClass|Class]]##
	- ##[[KeyPgFunction|Function]]##
	- ##[[KeyPgMemberSub|Sub (Member)]]##
	- ##[[KeyPgType|Type]]##

{{fbdoc item="back" value="CatPgUserDefTypes|User Defined Types"}}