oop tutorials

[Jesse Phillips]

I am wrong and have been wrong. I saw no need to thank Jarrett, I do 
appreciate it, but I was not the one requesting help. Saaa gave a thank 
you which says the information was received.

On Thu, 06 Mar 2008 19:25:43 -0500, Ty Tower wrote:

> Jarrett Billingsley Wrote:
> 
>> "Jesse Phillips" <jessekphillips at gmail.com> wrote in message
>> news:fqkejg$1vkn$1 at digitalmars.com...
>> > Just so you can ask that question, no not really but I'll tell you
>> > the difference.
>> >
>> > auto store = new Bike[10];
>> >
>> > Allocates memory on the heap, which means the function can return it.
>> >
>> > Bike[10] store;
>> >
>> > will allocate memory on the stack thus will not exist when the
>> > function returns. I had no reason not to use this, I just ended up
>> > not.
>> >
>> > And both arrays are static, thus there length will not change.
>> 
>> Nope.  new Bike[10] allocates a new dynamically-sized array of length
>> 10; the type of that expression is Bike[], not Bike[10].  It's really
>> sugar for new Bike[](10).  Thus its length can change.
>> 
>> It's not actually possible to allocate a statically-sized array on the
>> heap directly.  You have to use a templated struct and allocate that.
>> 
>> 
> I notice good old Jesse doesn't answer when someone corrects him. No
> thanks either There is a definate problem
> 
> So Tango version
> 
> module Bike;
> import tango.io.Stdout;
>  class Bike {
>     Human owner;
> 
>     this(Human o) {
>          owner = o;
>     }
>     public void newOwner(Human o) {
>          owner = o;
>     }
>  }
> 
>  class Human {
>     Bike bike;
>     char[] name;
> 
>  public:
>    this(char[] n) { name = n; }
> 
>     void ride() {
>          if(bike !is null) {
>              Stdout(name,"is now riding his new bike").newline;
>          }
>          else {
>             Stdout("This guy has to walk at first").newline;}
>     }
> 
>     void purchase(Bike b) {
>          b.newOwner(this);
>          bike=b;
>     }
>  }
> 
>  void main() {
>     auto store = new Bike[10];
>     store[] = new Bike(null);
> 
>     Human joe = new Human("Joe");
>     joe.ride();
> 
>    // Joe buys a new bike
>     joe.purchase(store[4]);
>     joe.ride();
>   
>  }
> 
> /* you will notice that the bike requires an owner, but I provided none
>  during creation. Also note that a Human does not have to own a bike,
>  would you want to force a creation of bike even though he has not
>  purchased one? I didn't test the code, but I hope it works.
> 
>  One of the things that happens as that you want a reference to an
>  object type, but not create a new one, because later you will be
>  getting the reference from somewhere else. Feel free to use what I have
>  given you.
> */
> Interesting -thanks to all three of you