OpenEuphoria

Re: Anxiety over 4.0

• Posted by Matt Lewis <matthewwalkerlewis at ?mail.co?> Jun 12, 2008
• 734 views

Bernie Ryan wrote:
> 
> Matt Lewis wrote:
> > 
> > Bernie Ryan wrote:
> > > 
> > > irv mullins wrote:
> > > > 
> > > 
> > > > However, in looking at some of the new capabilities - such as the
> > > > ability
> > > > to call functions with varying # of parameters
> > > 
> > > My Motor libraries have been able to do that since Euphoria ver 2.5 
> > 
> > It's not the same thing.  We've always been able to pass a sequence that
> > was used to contain the parameters.  In fact, one of the most commonly 
> > used built-in functions, printf, does just that.
> > 
> > With 4.0, you can specify default values for parameters, and users can
> > omit them.  For instance:
> > 
> > }}}
<eucode>
> > function round( atom number, integer decimal_places = 0 )
> > -- ...
> > end function
> > ? round( 1.5 )
> > ? round( 1.5, 0 )
> > </eucode>
{{{

> > 
> > In GUI libs, this can be very useful and convenient, when you often don't
> > need to specify positions, sizes or styles for controls.  A possible 
> > wxEuphoria based example:
> > }}}
<eucode>
> > function wxFrame( atom parent, sequence title, integer id = -1, 
> >     integer x  = -1, integer y  = -1, 
> >     integer cx = -1, integer cy = -1,
> >     integer style = 0 )
> > -- ...
> > end function
> > frame = wxFrame( 0, "My Frame" )
> > -- or...
> > frame = wxFrame( 0, "My Frame", , , , , , wxSOME_STYLE )
> > </eucode>
{{{

> > 
> 
> Matt:
> 
> Mine was: 
> 
> library("somelib.so")
> declare("wxFrame","...",s)

Yes, but how would you handle default parameters?  In any case, the above
call would be:

myFrame = f("wxFrame", {0, "My Frame", -1, -1, -1, -1, 0})

Also, that's mainly for calling routines in a shared/dynamic library, isn't
it?  In eu4.0, you can use default parameters calling native euphoria code.

Matt