On Sun, 09 Nov 2008 11:17:28 +0000, Arnaud Delobelle wrote:
> greg <[EMAIL PROTECTED]> writes:
>
>> Arnaud Delobelle wrote:
>>
>>> What's a variable reference?
>>
>> It's a reference to a variable. It's what gets passed behind the scenes
>> when you use a VAR parameter in Pascal, or a ByRef parameter in VB.
>
> Do you mean you can't do the following C++ snippet in Pascal or VB? I
> haven't used Pascal for more than 20 year and I have never used VB, so
> this is a real question.
>
> foo(int &x) {
> x = 7;
> }
>
> struct bar {
> int i;
> float j;
> };
>
> int main() {
> int a[10];
> bar b;
> // What is passed to foo below is obviously not a 'variable
> // reference' as the argument is not a variable.
> foo(a[3]); // Now a[3] == 7
> foo(b.i); // Now b.i == 7
> }
Translated to Pascal:
Program Test;
Type
Bar = Record
i: Integer;
j: Real;
End;
Var a: Array[0..9] Of Integer;
b: Bar;
Procedure Foo(Var x:Integer);
Begin
x := 7;
End;
Begin
Foo(a[3]);
WriteLn(a[3]); {Prints 7.}
Foo(b.i);
WriteLn(b.i); {Prints 7.}
End.
In "reality" I would not expect that anything is passed here but that the
compiler inlines it as direct assignment. Should read: Copying the bit
pattern of a 7 into the fixed memory locations. :-)
Ciao,
Marc 'BlackJack' Rintsch
--
http://mail.python.org/mailman/listinfo/python-list
