[fpc-pascal] Syntax changes suggestions

[Ryan Joseph]

> On Jul 18, 2018, at 3:05 PM, Sven Barth via fpc-pascal <fpc-pascal at lists.freepascal.org> wrote:
> 
> You have to keep in mind the history here. The "object" type is from Turbo Pascal times and back then it already showed its weaknesses. Then along came Delphi and Borland decided to introduce a brand new object model based on the "class" type which tackled the weak points of the "object" type and introduced some more polymorphism for the type. 
> You can't utilize polymorphism with "object" instances in the stack either. 

I didn’t know object had polymorphism limitations. What are they exactly?

> I really wonder why you keep thinking that you need them on the stack. I'm developing in Object Pascal (and this the "class" based model) for around 16 years or so and I never felt the need to put a class on the stack. I'm saying that while I also work with C++ at work for nearly 5 years and *do* use stack based structs and classes there. 

1) For general efficiency of not allocating a block of memory on the heap when I know for absolute 100% certainty I don’t need it beyond the current stack frame. For high performance situations it really does matter since you start dealing with heap fragmentation and extra overhead with the memory manager. I was doing a game engine recently and doing the create/free thing when I knew I didn’t have to was painful.

2) Often when declaring a variable I know with absolute 100% certainty that it will not survive the stack frame and I’ll be calling Free at the end of the function. I’d like to just stop thinking about memory management at that point and be ensured the class will be freed at the end of the function. C++ calls the destructor for you but FPC doesn’t do this for some reason. Why?

Regards,
	Ryan Joseph