Re: [hoc-users] Information on how to build a custom NSView subclass

[David C. <dw...@dw...>]

> 1) (Serious newbie q) What does the # stand for? I haven't seen that
> yet in what I have read.

# is the "call this selector" function.  These are equivalents:

// Objective-C
[someObject someSelector]

// Haskell
someObject # someSelector

More complicated equivalents:

// Objective-C
[someObject someSelector:foo withArgs:bar]

// Haskell
someObject # someSelectorWithArgs foo bar

And of course:

// Objective-C
[[someObject fooSelector] barSelector]

// Haskell
someObject # fooSelector >>= barSelector

 >>= serves as the "nested selectors" equivalent; the way that

> 2) For the general audience: Is there any way to make the getIvar code
> (obj #. var = obj # getIVar var) disappear? This appears in every
> class and seems like something that could be part of a base class, or
> part of the template definition (note that I have no idea how the
> template stuff works so...).

If you are not using it, you do not need to define it.  It is just a  
convenience function for accessing the instance variables of an object.

> 3) In general are all of the NSXxxx functions in
> Cocoa/Foundation/AppKit prefaced with nsXxxx in Haskell?

In general, yes.  It should be noted that not all functions are  
imported; it depends on how smart the ifgen script is (which, as I  
understand it, basically parses the header files for Cocoa and  
automates the wrapper generation for the ffi in Haskell).  I've  
thought that a tool like unto "perldoc" would be in order for some of  
the Haskell packages (I also haven't looked to see if Haddock docs  
are a generation option with hoc; it may be).

> Thanx,
> joe

David Christensen