NeXT Concepts.

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2 total messages Started by cyk Fri, 14 Aug 1992 20:50

#1165

Author: cyk
Date: Fri, 14 Aug 1992 20:50

51 lines
1890 bytes

Hi Guys,

   I came accross a couple of questions while reading the
NeXT Concept document.  I would appreciate if any one can
give me some help.  My questions are listed in the following:

   1] Can a client of a NeXT Step window server be running
      on a remote host?  If this is possible, under which
      document is this capability documented?

   2] Does NeXT Step take advantage of MACH's threading, 
      virtual memory management and messaging facilities?

      Is there any documentation on how application programs
      can benefit from the MACH facilities?

   3] In Concepts, there is an example, illustrating the use 
      of SUPER in Objective-C, in the following way:

      In B.h:

         class B: A {
            .
            .
         }

       In B.m:

         + new 
         {
		B   *bInstance;

		bInstance = [super new];
                    .
                    .
                return bInstance;
           }

       The semantics illustrated above seems to imply that 
       bInstance will be pointing an instance of A since
       "super" causes the invokataion of A's new.

       Will class object B return a structure, which properly
       represents the newly created instance of B, if B has 
       additional instance variables other than A's?

   Thanks in advance for your help.


                                 -----  Chi Ku

Re: NeXT Concepts.

#1186

Author: Brodie Lockard
Date: Mon, 17 Aug 1992 04:48

41 lines
2137 bytes

In article <900@tdat.teradata.COM> cyk@tos28.teradata.com () writes:

>   1] Can a client of a NeXT Step window server be running
>      on a remote host?  If this is possible, under which
>      document is this capability documented?

If you mean "Can an app running on one NeXT display on another?" then yes.
In the Preferences app on the displaying machine, under Unix Expert, check
"Public Window Server," log out, and log back in.  Then, open a shell on
the displaying machine, rlogin to the machine where the app is and type

appmachine>TheApp -NXHost displaymachine

After a bit, a miniwindow will appear at the bottom of displaymachine's
screen, representing the app.  Double-click it.

>   2] Does NeXT Step take advantage of MACH's threading, 
>      virtual memory management and messaging facilities?

Dunno.

>   3] In Concepts, there is an example, illustrating the use 
>      of SUPER in Objective-C, in the following way:

                ...
>		bInstance = [super new];
                ...
>
>       The semantics illustrated above seems to imply that 
>       bInstance will be pointing an instance of A since
>       "super" causes the invokataion of A's new.
>
>       Will class object B return a structure, which properly
>       represents the newly created instance of B, if B has 
>       additional instance variables other than A's?

bInstance will be pointing to an instance of B, which is exactly like an
instance of A, except that it has whatever additional instance variables
and methods you've declared in B.h.

Brodie Lockard      brod@jessica.stanford.edu

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