STATIC cbStatic
Function Main()
Local a := TestBlocks()
LOCAL cb
qout( eval( a[ 1 ] ) ) qout( eval( a[ 2 ], 42 ) ) qout( eval( a[ 1 ] ) ) qout( eval( a[ 2 ], 15 ) ) mqout( 15, eval( a[ 1 ] ) ) mqout( 14, eval( a[ 1 ] ) ) mqout( 42, eval( a[ 2 ], 42 ) ) mqout( 14, eval( a[ 2 ], 42 ) ) mqout( 42, eval( a[ 1 ] ) ) mqout( 14, eval( a[ 1 ] ) ) GetArray( @a )
PrintArray( @a )
qout( "Test for variables passed by reference in a codeblock" )
DetachWithRefer()
qout( "Test for indirect detaching of local variables" )
DetachToStatic( 1 )
mqout( 2, EVAL( cbStatic, 1 ) )
mqout( 3, EVAL( cbStatic, 2 ) )
cb :=cbStatic
DetachToStatic( 100 )
mqout( 200, EVAL( cbStatic, 100 ) )
mqout( 300, EVAL( cbStatic, 200 ) )
mqout( 4, EVAL( cb, 3 ) )
ReferParam()
Return( NIL )
Static Function TestBlocks()
LOCAL nFoo := 23
Return( { {|| nFoo }, {|n| nFoo := n } } )
Static Function mqout( nExpected, nGot )
qout( nExpected, nGot )
Return( NIL )
PROCEDURE GetArray( a )
LOCAL i
a :=ARRAY( 100 )
FOR i:=1 TO 100
IF( (i % 6) == 0 )
a[ i-2 ] =NIL
a[ i-4 ] =NIL
ENDIF
a[ i ] := TestBlocks()
NEXT
RETURN
PROCEDURE PrintArray( a )
LOCAL i
FOR i:=1 TO 100
IF( a[i] != NIL )
EVAL( a[ i ][ 2 ], i )
mqout( i, EVAL( a[ i ][ 1 ] ) )
ENDIF
NEXT
RETURN
Function DetachWithRefer()
Local nTest
Local bBlock1 := MakeBlock()
Local bBlock2 := {|| DoThing( @nTest ), qout( nTest ) }
eval( bBlock1 )
eval( bBlock2 )
Return( NIL )
Function MakeBlock()
Local nTest
RETURN( {|| DoThing( @nTest ), qout( nTest ) } )
Function DoThing( n )
n := 42
Return( NIL )
FUNCTION DetachToStatic( n )
cbStatic ={|x| n+x}
RETURN NIL
Function ReferParam()
Local bResult
? "Test for codeblock parameter passed by reference"
PassByValue( {|lEnd| ;
bResult := GetBlock( @lEnd ), ;
SetByRef( @lEnd ) } )
? "Printed value in Clipper .T. =", Eval( bResult )
?
PassByRef( {|lEnd| ;
bResult := GetBlock( @lEnd ), ;
SetByRef( @lEnd ) } )
? "Printed value in Clipper .T. =", Eval( bResult )
?
? "2nd test for codeblock parameter passed by reference"
PassByValue( {|lEnd| ;
SetByRef( @lEnd ), ;
bResult := GetBlock( @lEnd ) } )
? "Printed value in Clipper .F. =", Eval( bResult )
?
PassByRef( {|lEnd| ;
SetByRef( @lEnd ), ;
bResult := GetBlock( @lEnd ) } )
? "Printed value in Clipper .F. =", Eval( bResult )
?
Return Nil
Static Function PassByValue( bBlock )
Local lSomeVar := .T.
Eval( bBlock, lSomeVar )
? "lSomeVar value in Clipper .T. =", lSomeVar
Return .T.
Static Function PassByRef( bBlock )
Local lSomeVar := .T.
Eval( bBlock, @lSomeVar )
? "lSomeVar value in Clipper .F. =", lSomeVar
Return .T.
Static Function SetByRef( lVar )
lVar := .F.
Return Nil
Static Function GetBlock( lVar )
Return {|| lVar }