[fpc-pascal] += property bug?

[Rainer Stratmann]

On Mittwoch, 14. August 2019 18:24:40 CEST Michael Van Canneyt wrote:
> On Wed, 14 Aug 2019, Ryan Joseph wrote:
> >> On Aug 14, 2019, at 12:04 PM, Rainer Stratmann <rainerstratmann at t-
online.de> wrote:
> >>> It’s so
> >>> intuitive that basically all languages have adopted the syntax.
> >> 
> >> That is not true
> > 
> > All languages I use have them: Pascal, C, PHP, C#, Swift, Python,
> > JavaScript. These are some of the most popular languages in the world
> > right now. You’re fighting a losing battle sir.
> I don't see what the issue is ?
> 
> You do have +=  and the like. They exist, since about as long as I can
> remember.

Didn't you know that Ryan?

> You just cannot use it on properties.
> 
> Properties have some other restrictions as well:
> 
> * You also cannot Use Inc() on integer properties,
> * or use Include()/Exclude() on set properties.
> * You also cannot do SomeRecordProp.X:=Y;
> * or pass them to functions that require var arguments.
> 
> And I'm probably forgetting some other limitations.
> 
> The += is just another one in the list of limitations of properties.
> 
> Basically any operation that requires an address is not allowed.
> That += is using an address is an implementation detail of the compiler.
> Same as Inc() or In/Exclude(). I don't know the exact reason for this
> limitation, but it's bound to be a good one, otherwise it would have been
> lifted a long time ago...
> 
> And if someone doesn't like these limitations of properties, (s)he can use
> fields. No-one abolished those, after all.
> 
> Michael.