Whats the diferance between out and inout? In Delphi there is the var keyword which i guese is the same as out as is basicly 'pass by referance', although it does have one ambiguity where if you need to pass an object by referance does the callee or called function create and clean up the object. I geuse this isnt a problem with a GC. So anyway  i have an idea...

if you have a function

void foo(int x, int y, out a, out  h);

how about allowing the syntax to call the function...

(p, q) = foo(x,y);

which would be treated as identical to

foo(x,y, out p, out q)

so it would be purely cosmetic, much nicer to look at ihmo. Mabey there would need to be the limitation that it can only be used with functions with no return type?

chris

"chris jones" <flak@clara.co.uk> wrote in message news:ale82d$v0o$1@digitaldaemon.com...
> Whats the diferance between out and inout? In Delphi there is the var keyword which i guese is the same as out as is basicly 'pass by
referance',
> although it does have one ambiguity where if you need to pass an object by referance does the callee or called function create and clean up the
object.
> I geuse this isnt a problem with a GC. So anyway  i have an idea...
>
> if you have a function
>
> void foo(int x, int y, out a, out  h);

should be

void foo(int x, int y, out float a, out float h);

"chris jones" <flak@clara.co.uk> wrote in message news:ale82d$v0o$1@digitaldaemon.com...
> Whats the diferance between out and inout?

An inout passes a reference to a value in, which can be modified. An out passes a reference to an uninitialized value; the function is expected to initialize it.

I really like the idea of tuples, which are inherently just anonymous structs.  Tuples can be used as parameter lists or multiple return values or anywhere you'd use a regular struct.  They replace the std::pair template in C++ among other things.

Then treat the return values and parameter lists of functions in the
language as just being tuples, and you're set.  You construct a tuple with
(a,b,c) syntax and if the types match or are convertible, it can be assigned
to a compatible tuple or struct.  I'd support naming tuple members (such as
parameter list identifiers) (int a, int b, char[] c) and initialization by
named fields.  (a:1,b:2,c:"foo")

Sean

"chris jones" <flak@clara.co.uk> wrote in message news:ale82d$v0o$1@digitaldaemon.com...
> Whats the diferance between out and inout? In Delphi there is the var keyword which i guese is the same as out as is basicly 'pass by
referance',
> although it does have one ambiguity where if you need to pass an object by referance does the callee or called function create and clean up the
object.
> I geuse this isnt a problem with a GC. So anyway  i have an idea...
>
> if you have a function
>
> void foo(int x, int y, out a, out  h);
>
> how about allowing the syntax to call the function...
>
> (p, q) = foo(x,y);
>
> which would be treated as identical to
>
> foo(x,y, out p, out q)
>
> so it would be purely cosmetic, much nicer to look at ihmo. Mabey there would need to be the limitation that it can only be used with functions
with
> no return type?
>
> chris

"Walter" <walter@digitalmars.com> wrote in message news:aleesk$1dfd$1@digitaldaemon.com...
>
> "chris jones" <flak@clara.co.uk> wrote in message news:ale82d$v0o$1@digitaldaemon.com...
> > Whats the diferance between out and inout?
>
> An inout passes a reference to a value in, which can be modified. An out passes a reference to an uninitialized value; the function is expected to initialize it.

It makes sense now.

chris